P0138 code chevy equinox

When the P0133 code is set, it means that the O2 sensor isn’t altering the voltage output as it should when the air-fuel ratio changes. For that reason, it’s categorized as having a slower response than normal. This code indicates trouble with oxygen sensor #1 on bank #1, which is on the same side of the engine as cylinder #1.

In some cases, the P0420 Chevy Equinox trouble code could be caused by a number of other issues. The most common of these is a faulty catalytic converter. This code is caused by the oxygen sensor on the upstream side of the catalytic converter. Lastly, the vehicle may have exhaust leaks, and the oxygen sensor will be inoperable.Equinox is a temple of well-being, featuring world-class personal trainers, group fitness classes, and spas. Voted Best Gym in America by Fitness Magazine.Here are the most common issues that cause the P0137 code in the Chevy Equinox. They are presented in order (somewhat) of most to least likely to cause the problem. Bad Oxygen Sensor – The O2 sensor itself is one of the most likely reasons that P0137 is triggering your service engine soon light.The O2 sensor circuit is responsible for examining the exhaust gas and detecting the air to fuel ratio difference. Some common symptoms that signify the engine code P0138 include: • Rough idle. • Poor fuel economy. • “On” check engine light. • Bad gas mileage. • Lagging / missing engine. • Emissions test is a fail.FIX CODE P0036 P0054 P0137 P0138 P0141 ENGINE LIGHT CHEVY, CHEVROLET, GMC, BUICK, CADILLAC Car Scanner: https://amzn.to/2G5lxTi Oxygen Sensor Socket: https...Jan 12, 2021 · GM Tech (Cam) Owner/Technician. Vocational, Technical or Tra... 28,691 satisfied customers. Chevrolet Impala LT: I have a 2009 impala, I am getting three. I have a 2009 impala, I am getting three codes that deal with the secondary air injection system. the codes are P2440, P0411, P2431. Can you … read more. What is the Cost to Diagnose the Code P2271 Chevrolet? Labor: 1.0. The cost to diagnose the P2271 Chevrolet code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

0:00 / 3:30 How to Fix a P0138 Code: O2 Sensor Circuit High Voltage Bank 1 Sensor 2 AutoEclinic 25.9K subscribers 923K views 11 years ago Emission & Evap Manufacturers constantly strive to...P2138 is a diagnostic trouble code (DTC) for "Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light ...This video will demonstrate How we Test & Replace Camshaft Position Solenoid – Code P0014 - 2015 Chevy Equinox 2.4 Liter Engine🛠️🧰👨‍🔧🔩⚡ TOOLS & MATERIAL...Diagnostic trouble code (DTC) P0138 stands for O2 Sensor Circuit High Voltage (Bank 1, Sensor 2). The code will set when your car’s primary computer—also called the powertrain control module (PCM)—detects that, for a given period of time, the voltage signal from the rear O2 sensor is too high.The P0138 code is set when the ECM detects a higher than average voltage reading (usually about 1.2 volts). More About P0136 And Its Related Codes.Mar 3, 2019 · Here are the most common issues that cause the P0137 code in the Chevy Equinox. They are presented in order (somewhat) of most to least likely to cause the problem. Bad Oxygen Sensor – The O2 sensor itself is one of the most likely reasons that P0137 is triggering your service engine soon light.

Common Problems That Trigger the P0138 Code. Defective oxygen sensor/air fuel ratio sensor. Defective oxygen sensor/air fuel ratio sensor heater circuit. Exhaust system leak. Defective catalytic converter. Intake air system leak (including vacuum leaks) Low fuel pressure. Defective engine coolant temperature sensor.P2270 is a generic OBD-II code that appears with many manufacturers. It shows that the O2 sensor signal is stuck in a lean condition. The faulty reading is coming from the second O2 sensor on …Code P0138 appears when the sensor voltage reaches over 1.2. The high voltage signals that there is too much fuel and not enough oxygen running through your motor. See Also: Code P0130 , Code …Aug 14, 2018 · P0300 is a generic OBDII code that can occur with the Chevy Equinox. This code indicates that your vehicle’s engine is misfiring and can be a drivability threat. P0300 is often accompanied by cylinder-specific misfire codes (P030X, where the X indicates the cylinder number that is misfiring). If you have P0300 and a cylinder-specific misfire ...

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A Code 12 consists of one flash, a short pause, then two flashes in rapid succession. 2:. After Code 12 is displayed, any stored trouble codes will be displayed by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" light. All codes are displayed 3 times each then a code 12 will repeat.The P0152 code is a trouble code suggesting a possible issue with an oxygen sensor or its circuit. Find out more about the definition, causes, and symptoms of P0152 with this guide. What Does the P0152 Code Mean? Diagnostic trouble code (DTC) P0152 stands for “O2 Sensor Circuit High Voltage (Bank 2, Sensor 1).2013 Equinox, I had a generic code read done at oriellys and after doing so I replaced both O2 sensors the front catalytic converter and something else...16 mar 2020 ... Chevrolet Equinox Engine Computers · Chevrolet Express Engine ... The P0138 Trouble Code and How To Deal With It. p0138-trouble-code-and-how-to ...Labor: 1.0. To diagnose the P2271 Chevrolet code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.Q: What is p0138 chevy and why is it important? A: P0138 is a diagnostic trouble code that refers to a malfunction in the oxygen sensor circuit of a Chevrolet vehicle. This code …

2010 Chevy Cobalt Codes p0013 and p2271 I have a 2010 Chevy colbolt codes I need help with are p0013 and p2271 the light just came on. Plz help... P2271 01/02 code I have a 2008 chevy express 1500 cargo van with a 4.3 v6 . Every now and then I get a P2271 01/02 code with check engine light on.What is the Cost to Diagnose the Code P013E Chevrolet? Labor: 1.0. The cost to diagnose the P013E Chevrolet code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.Mar 3, 2022 · P0138 definition: O2 Sensor Circuit High Voltage (Bank 1, Sensor 2) Issue Severity: MODERATE – Extended driving with this code can cause internal engine damage. Repair Urgency: Get this code fixed withing the next month to prevent internal engine damage. Diagnosis: It is important to complete the entire diagnostic process when diagnosing the ... What Does Code P0138 Mean? P0138 definition: O2 Sensor Circuit High Voltage (Bank 1, Sensor 2) Issue Severity: MODERATE – Extended driving with this code can cause internal engine damage. Repair Urgency: Get this code fixed withing the next month to prevent internal engine damage.Code P0446 sometimes indicates that an electrical failure has been detected in either the vent valve itself or its control circuit. While the P0446 can indicate an electrical problem on later model Fords, which, for some strange reason chooses to look at the vent valve electrical circuit to set this code, the P0446 code is highly unlikely to be an …The control circuit is pulled-up to a low current voltage, 1.5-4.5 V on the control circuit is normal. 2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal A and ground. If the test lamp illuminates, test the control circuit for a short to voltage.Jan 4, 2020 · So I did the O2 sensor hack. For the 2012 equinox you need a 330K resistor and a 1uF electrolytic capacitors rated at around 50V. Resistor on line on the black wire and cap across the black and grey with positive side on resistor downstream of the sensor. There is schematics online just don’t use the resistor value in a Chevy it’s too high. The codes I’m getting from my OBD-II scanner are: P0013 (cam position B- actuator circuit) P0014 (cam pos B- timing over advanced or system performance) And P0138 (O2 sensor circuit high voltage) ... I Bought A Used 2005 Chevy Equinox And I Love It …P0420 Permanent Code is the ECU saying the "second" O2 sensor (s) after your first catalytic converter (s) are not sending the signals the computer expects in relation to the signals the first O2 sensor (s) located in the exhaust manifold, are sending. 1.

This code indicates that the throttle valve is not in the position the PCM (Powertrain Control Module) expects it to be in. What causes the P2119 code? Most often the cause of this code is either the TPS (Throttle Position Sensor) which is an integral part of the throttle body or the TPPS (Throttle Pedal Position Sensor) which is part of the …

The 2014 Chevy Equinox is a reliable and dependable SUV that has been a favorite among drivers for years. But how long can you expect it to last? Here, we’ll explore the expected lifespan of a 2014 Chevy Equinox and provide tips on how to e...Get ratings and reviews for the top 11 gutter guard companies in Chevy Chase, MD. Helping you find the best gutter guard companies for the job. Expert Advice On Improving Your Home All Projects Featured Content Media Find a Pro About Please...Here are the most common causes of the P0014 code in your Chevy Equinox. Start by checking your vehicle’s oil level. Here are the most common causes, presented in order from the easiest thing to check to the most difficult: Engine Oil. The first thing you should do is check your Equinox’s oil. There are three ways that it can cause …According to the GM service bulletin, in some 2011-2013 Chevy, Buick and Cadillac vehicles the code P0442 might be caused by the leaking EVAP Vent Solenoid (CVS). The vent solenoid must be tested under vacuum and replaced if leaking. Another GM service bulletin 02-06-04-037J for Chevy Silverado / GMC Sierra recommends replacing the vent valve ...What repairs can fix the P0107 code? The most common repairs to address the P0107 code are as follows: Verify the code with an OBD-II scanner. Reset the fault codes and then perform a road test. If the P0107 code comes back, then follow the test procedure. Check the MAP sensor voltage in and out along with the electrical connector and wiring.Dec 27, 2022 · What Does Chevrolet Equinox Code P0014 Mean? Chevrolet Equinox P0014 definition: Exhaust Camshaft Timing- Over-Advanced Bank 1 Issue Severity: SEVERE – Stop driving immediately. Repair Urgency: Fix this code immediately (same-day if possible) to avoid damage to multiple internal engine components. Diagnosis: This trouble code severely impacts the drivability of your vehicle. The most common The P0053 code indicates a potential problem with the bank 1 sensor 1 oxygen sensor’s heater circuit. Learn more about this code, its symptoms, and potential causes with this short guide. What Does the P0053 Code Mean? Diagnostic trouble code (DTC) P0053 stands for “Heated O2 Sensor (HO2S) Heater Resistance (Bank 1, Sensor 1). It indicates ...Jun 4, 2018 · P0420 Permanent Code is the ECU saying the "second" O2 sensor (s) after your first catalytic converter (s) are not sending the signals the computer expects in relation to the signals the first O2 sensor (s) located in the exhaust manifold, are sending. 1.

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Recommended Services. The code P0138 is on for two possible different situations. Either the oxygen sensor has shorted out on the exhaust system or the wiring from the battery to the sensor has a short or break in it. Check the oxygen sensor and see if the wiring is plugged in and if there is any broken wires at or near the sensor. If there is ...Sep 28, 2023 · Diagnostic trouble code (DTC) P0138 stands for O2 Sensor Circuit High Voltage (Bank 1, Sensor 2). The code will set when your car’s primary computer—also called the powertrain control module (PCM)—detects that, for a given period of time, the voltage signal from the rear O2 sensor is too high. Diagnostic trouble code (DTC) P0138 stands for O2 Sensor Circuit High Voltage (Bank 1, Sensor 2). The code will set when your car’s primary computer—also called the powertrain control module (PCM)—detects that, for a given period of time, the voltage signal from the rear O2 sensor is too high.The 2024 Chevrolet Equinox starts at roughly $26,600 for the LS trim with front-wheel drive. The LS comes with niceties like wireless smartphone connectivity, a Wi-Fi hot spot and numerous driver-assistance features. The LT trim ($29,459) adds features like heated front seats and a power liftgate.About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...What does this mean? Code P0138 Chevrolet Tech Notes Replacing the Rear Heated Oxygen Sensor (HO2S) Bank 1 usually takes care of the problem. User Submitted Video ⚠ Does your Chevrolet have Safety Recalls? → Check here How to Fix the DTC P0138 Chevrolet? Check the 'Possible Causes' listed above.P2273 is a generic trouble code that indicates a possible problem with the oxygen sensor’s signal. Code P2273 is set once the signal that’s sent by the oxygen sensor is stuck rich. This usually means that there’s inadequate air in the exhaust. The oxygen sensor signal is designed to fluctuate within a given voltage range.Repair for common codes P-0010 through P0029. Variable valve timing solenoid cleaning or replacements on Chevy's 2.4L ecotec engine for check engine codes....Aug 3, 2023 · Code P0137 is a generic trouble code, meaning it can be experienced across a variety of vehicle brands. But the translation of this code may differ from one brand to another. For example, a P0137 on a Toyota translates to “Oxygen Sensor Circuit Low Voltage Bank 1, Sensor 2”; a P0137 on a Chevy, meanwhile, is “Heated Oxygen Sensor (HO2S ... ….

Oct 21, 2016 · I am getting P0138 and P0140 codes on my Chevy Equinox. I just had the catalytic converter replaced due to a recall. - Answered by a verified Chevy Mechanic. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright ...Subscribe to not miss a video from PS AUTOMOTIVE https://bit.ly/35YP5OeChevy Equinox P0137 Oxygen Sensor Replacement & Location Tutorial In this video we a...Here we have a 2010 through 2017 Chevy Equinox with a 2.4-liter engine. In this video, we're going over the top check engine light codes that you could get for this vehicle. Let's start with the P0014 which has to do with the exhaust camshaft actuator solenoid valve which is located right here. This is the exhaust side.Repair for common codes P-0010 through P0029. Variable valve timing solenoid cleaning or replacements on Chevy's 2.4L ecotec engine for check engine codes....Repair for common codes P-0010 through P0029. Variable valve timing solenoid cleaning or replacements on Chevy's 2.4L ecotec engine for check engine codes....2010 Chevrolet Equinox Technical Service Bulletins. Your path: TSB Home >> 2010 >> 2010 Chevrolet >> 2010 Chevrolet Equinox The following TSB(s) may apply to your 2010 Chevrolet Equinox. The source of the information below is the National Highway Transportation Safety Administration (NHTSA), which maintains TSBs for vehicles sold in …Cars & Trucks Master. 3,347 Answers. DTC P0138: HO2S Circuit High Voltage Bank 1 Sensor 2. This code does not tell you to replace the O2 sensor , it's a circuit problem .Testing the electric circuit. Circuit/System Testing. Ignition OFF, disconnect the harness connector at the appropriate HO2S. Ignition ON, verify the scan tool HO2S voltage ...P0138 is a common OBDII code that occurs in many vehicles, including the Chevy Equinox. The code is triggered when: The voltage at the sensor remains above threshold for 20 seconds or more. Voltage to the sensor is to high (wiring problem, think short) Bad O2 sensor itself. P0138 code chevy equinox, P0138 - 2015 3.6L Terrain. Wife called me and said the CEL was on. When I got home, I pulled the codes and seeing a P0138 which I "think" is Bank1 Sensor2. Using a BT ODB scanner with my phone, I can clearly see that the secondary sensor goes high and stays high the moment it warms up., Sep 15, 2023 · Diagnostic trouble code (DTC) P013E stands for “O2 Sensor Delayed Response–Rich to Lean (Bank 1, Sensor 2).” The code is logged when the powertrain control module (PCM) perceives a delay in response from the downstream oxygen (O2) sensor located in bank 1. , The P0401 DTC means that the computer detected an insufficient amount of exhaust gas recirculation (EGR) flow in the system. In most cases, the ECM/PCM recognizes the failure from two consecutive trips through the feedback loop before setting the code and turning on the Check Engine Light. The exhaust gas recirculation (EGR) …, 2010 Chevrolet Equinox Technical Service Bulletins. Your path: TSB Home >> 2010 >> 2010 Chevrolet >> 2010 Chevrolet Equinox The following TSB(s) may apply to your 2010 Chevrolet Equinox. The source of the information below is the National Highway Transportation Safety Administration (NHTSA), which maintains TSBs for vehicles sold in …, What Does Code P0131 Mean? P0131 definition: O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1) Issue Severity: MODERATE – Extended driving with this code may cause internal engine damage. Repair Urgency: Get this code fixed as soon as possible to avoid emission system and catalytic converter damage. Diagnosis: Driving …, Oct 6, 2023 · What Does the P0132 Code Mean? Diagnostic trouble code (DTC) P0132 stands for “Oxygen Sensor Circuit High Voltage (Bank 1, Sensor 1).” It involves the vehicle’s oxygen sensor, specifically the #1 sensor on Bank 1. This code is triggered when the PCM or powertrain control module detects that your heated oxygen sensor reading is too high. , 2013 Chevrolet Equinox 2LT FWD. -. Maintenance & Repair. How to fix C0561 and P0404 error codes for Chevrolet Equinox 2008 ? 3 Answers. I know little about cars ..., Here we have a 2010 through 2017 Chevy Equinox with a 2.4-liter engine. In this video, we're going over the top check engine light codes that you could get for this vehicle. Let's start with the P0014 which has to do with the exhaust camshaft actuator solenoid valve which is located right here. This is the exhaust side., #Google, #Yahoo!, #Amazon, #Bing, #Ask.com, #DuckDuckGo, #Yandex, #AOL, #Ecosia, #Baidu2016 - 2017 Chevy Equinox trouble code P0014 & How to fix it.2017 Chev... , Envíos gratis en el día ✓ Compra en meses sin intereses y recibe tu ☞ Sensor Oxigeno Banco 1 Chevrolet Equinox 3.4 05-09 Acdelco., The codes I’m getting from my OBD-II scanner are: P0013 (cam position B- actuator circuit) P0014 (cam pos B- timing over advanced or system performance) And P0138 (O2 sensor circuit high voltage) ... I Bought A Used 2005 Chevy Equinox And I Love It …, Your path: TSB Home >> 2010 >> 2010 Chevrolet >> 2010 Chevrolet Equinox The following TSB(s) may apply to your 2010 Chevrolet Equinox . The source of the information below is the National Highway Transportation Safety Administration (NHTSA) , which maintains TSBs for vehicles sold in the United States., Buick Envision 2016 Regal 2014-2019 Cadillac ATS 2013-2019 Cadillac CTS 2014-2019 Chevrolet Camaro 2016 -2019 Chevrolet Equinox 2018 -2019 Chevrolet Malibu 2013-2019 Chevrolet Traverse 2018-2019 GMC Terrain 2018-2019. All of the above vehicles equipped with the 2.0L LTG engine manufactured before May 7, 2019 or engine label T119127XHXTX0251., #Google, #Yahoo!, #Amazon, #Bing, #Ask.com, #DuckDuckGo, #Yandex, #AOL, #Ecosia, #Baidu2016 - 2017 Chevy Equinox trouble code P0014 & How to fix it.2017 Chev..., Code P0138 appears when the sensor voltage reaches over 1.2. The high voltage signals that there is too much fuel and not enough oxygen running through your motor. See Also: Code P0130 , Code …, Diagnostic Trouble Code P0138 (DTC P0138) is defined as "O2 Sensor Circuit High Voltage (Bank 1 Sensor 2).". Oxygen sensor 2 is a downstream oxygen sensor or the secondary heated oxygen sensor (HO2S 2) on Bank #1. It measures the air-fuel mixture or the oxygen storage capacity of the catalytic converter and produces a relevant output signal ..., Chevy Equinox P0138 & P0140 Codes: Q&A on Troubleshooting and Solutions Ask an Expert Car Questions Chevrolet Repair Ron Z., - Chevy Tech - 26,236 Satisfied Customers 18+yrs experience. State Inspector and Chevy Diagnostics Ron Z. is online now Related Chevy Questions 97 chevy c1500 with a 3 sensor system shows p0140 for a non, What does this mean? Code P0138 Chevrolet Tech Notes Replacing the Rear Heated Oxygen Sensor (HO2S) Bank 1 usually takes care of the problem. User Submitted Video ⚠ Does your Chevrolet have Safety Recalls? → Check here How to Fix the DTC P0138 Chevrolet? Check the 'Possible Causes' listed above. , While it’s common for the HO2S to wear out over time, there are a number of other issues that trigger a P0138 diagnostic code and have nothing to do with the oxygen sensor. These include: An inefficient catalytic converter. Engine vacuum leaks that create a lean exhaust condition. Mass airflow sensor failure that creates a rich exhaust condition., Code P0455 Chevrolet Tech Notes. The P0455 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). A loose fuel tank filler cap is the most common cause that will trigger the P0455 code. There is a factory service bulletin for all the models from 2000 through 2021. The factory states that there …, This code is supposed to let you know that there is an issue with the wiring or harness going to the sensor, or the sensor itself is bad. There are other things that cause …, P0420 Permanent Code is the ECU saying the "second" O2 sensor (s) after your first catalytic converter (s) are not sending the signals the computer expects in relation to the signals the first O2 sensor (s) located in the exhaust manifold, are sending. 1., Chevy Equinox – (Jonathan Weiss / Shutterstock) The most common signs of bad O2 sensor in Chevy Equinox are slow acceleration, loss of power, irregular idling, engine hesitation or jerking when accelerating, high fuel consumption, higher tailpipe emissions, foul odor from exhaust, check engine light illuminates, and sometimes stalling., Dec 4, 2020 · Buick Envision 2016 Regal 2014-2019 Cadillac ATS 2013-2019 Cadillac CTS 2014-2019 Chevrolet Camaro 2016 -2019 Chevrolet Equinox 2018 -2019 Chevrolet Malibu 2013-2019 Chevrolet Traverse 2018-2019 GMC Terrain 2018-2019. All of the above vehicles equipped with the 2.0L LTG engine manufactured before May 7, 2019 or engine label T119127XHXTX0251. , The Chevy’s rear axle code contains information on the vehicle’s gear ratio, date of manufacture and the rear axle assembly plant. The prefix on the code consists of two letters for Chevrolet vehicles built in 1969 and earlier and three let..., SOURCE: Location of o2 sensor for 2011 Chevy equinox. They are on the exhaust pipes in front of and behind the catalytic converter there is either 3 or 4 of them. Posted on Jan 30, 2016., What Does Chevrolet Equinox Code P0014 Mean? Chevrolet Equinox P0014 definition: Exhaust Camshaft Timing- Over-Advanced Bank 1 Issue Severity: SEVERE – Stop driving immediately. Repair Urgency: Fix this code immediately (same-day if possible) to avoid damage to multiple internal engine components. Diagnosis: This trouble code severely impacts the drivability of your vehicle. The most common, 98 Dakota P0138 code have a 1998 dakota 4x4 (3.9 5 speed) light came on and I scanned a P0138 code. I replaced both sensors and reset computer. Light came on again abouit 10 miles down road with the same code. I traced wire where I could looking for any signs of …, When trouble code P0138 is set, this indicates that there is a high voltage (steadily above .9 volts) for more than 10 seconds indicating a lack of oxygen in the …, Envíos gratis en el día ✓ Compra en meses sin intereses y recibe tu ☞ Sensor Oxigeno Banco 1 Chevrolet Equinox 3.4 05-09 Acdelco., P0300 is a generic OBDII code that can occur with the Chevy Equinox. This code indicates that your vehicle’s engine is misfiring and can be a drivability threat. P0300 is often accompanied by cylinder-specific misfire codes (P030X, where the X indicates the cylinder number that is misfiring). If you have P0300 and a cylinder-specific misfire ..., Here are the most common issues that cause the P0138 code in the Chevy Equinox. They are presented in order (somewhat) of most to least likely to cause the problem. 1. Bad Oxygen Sensor– The O2 sensor itself is one of the most likely reasons that P0138 is triggering your service engine soon light. … See more, Common Problems That Trigger the P0138 Code. Defective oxygen sensor/air fuel ratio sensor. Defective oxygen sensor/air fuel ratio sensor heater circuit. Exhaust system leak. Defective catalytic converter. Intake air system leak (including vacuum leaks) Low fuel pressure. Defective engine coolant temperature sensor.