P0037 code

This refers to a problem with the heater element circuit of the HO2S. Heater element plays a very important component for its function. The sensor sends its reading to the PCM, and the PCM automatically adjusts the level of fuel being delivered to the engine.

This will allow the engine to enter the closed loop faster and with reduced emissions on cold startup. The PCM also continuously monitors the heater circuit for any abnormal voltages, or in some cases, even the amperages. Knowing which type of vehicle you have is important, as the PCM activates the heater through different circumstances.

Should the PCM will detect the problem with the oxygen sensor heater circuit, be it low current or open circuit, it will automatically enter failsafe mode until the engine is turned off. Depending on the manufacturer and the make of the vehicle, this will cause different drivability issues, such as:.

The most common cause of this error code is that, the HO2S bank 1, sensor 2 located at the back of the catalytic converter of the engine is unable to send the correct data to the PCM, which may suggest damage or a defect with the sensor. The sensor may have a bad internal heater element.

P0037 OBD-II Trouble Code: HO2S Heater Control Circuit Low (Bank 1, Sensor 2)

It could also be a case of bad ground or failed 12V battery input or connector. To diagnose for this error code, mechanics use the OBD-II scanner to test and re-test the vehicle, and then take it for a test drive to see if the code returns. Should it come back, the mechanic will then check the sensor for both power and ground, including its wiring. Many error codes are actually triggered by faulty wiring.

Repair or replace any damage to the sensor or its wiring system if needed. Then, make sure the wiring is properly routed from the exhaust. Then, check whether the ground for Heater Control circuit is intact.

If it is, then remove the oxygen sensor and check for any signs of damage. If you have access to resistance specs of the vehicle, use the Ohmmeter and conduct a resistance test of the heater element. Should you detect infinite resistance, then that means there is a problem of open heater.

For this, you need to replace the oxygen sensor. Wiring damage caused by excessive heat is usually the cause of this error code, along with other related error codes. Thus, fixing usually starts with inspection and repair of any wiring issues. Make sure the wiring system is all in good condition, with proper voltage and ground, before you think of replacing the sensor.

Though you most definitely can drive the vehicle with this error code, it is important to fix it as soon as possible to prevent further issues such as sensor loop errors, poor operation, high fuel consumption, or damage to other components of the engine. Remember me.

Table of Contents. Subscribe to our mailing list.What about the obd code? The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module ECM. In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load.

The ECM controls the heater element circuit by allowing current flow to ground. The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.

Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Search for: Search. The code means that there is a problem with the heater element circuit of the heated oxygen sensor.

Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. The P Volvo is set when the ECM detects an excessively low voltage through the heated oxygen sensor heater circuit. Leave a Reply Cancel reply Your email address will not be published.The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module ECM.

In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground. The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.

Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors.

P0037 - HO2S Heater Control Circuit Low Bank 1 Sensor 2

The list of automotive Makes at the right edge of the screen. The currently selected ODB-ii codes is for the Jeep makes.

Enter the 5 character trouble codes in the search box and submit the search. If your OBD-II trouble codes are for a different car, select that vehicle series before searching for the diagnostic codes because not all OBD2 codes used by one manufacture are used by the other makes. The information contained on this site is presented for informational purposes only. We are not responsible for any actions you take on your vehicle. If you have any doubt as to repairs on your vehicle, please contact your technician.

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p0037 code

Search for: Search. What does this mean? Possible Solutions The code means that there is a problem with the heater element circuit of the heated oxygen sensor. Note: 1. Leave a Reply Cancel reply Your email address will not be published.Visually inspect the related wiring harness and connectors.

Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins. P Tech Notes The code means that there is a problem with the heater element circuit of the heated oxygen sensor. Water getting inside the heated oxygen sensor connector can caused the heated oxygen sensor fuse to blow, which is a very common problem for this type codes.

p0037 code

Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. HO2S Heater Control Circuit Low Bank 1 Sensor 2 is the generic definition for the P; however your vehicle's manufacturer may have a different definition and information for the P code. What does this mean? Cost of diagnosing the P code Labor: 1. The auto repair labor rates vary widely across the country, and even within the same city.

When is the P code detected? The P is set when the ECM detects an excessively low voltage through the heated oxygen sensor heater circuit. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module ECM. In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor.

The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground. The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.

P More Information Need more information on how to fix the P code? Get Access to Factory Service Manuals. Related Information.

Repair Importance Level: 2. Why is the Engine Light ON?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 diagnostic.

P indicates that, for the engine to run correctly, the exhaust must have a specific air fuel ratio of If the code is cleared and reset, and then the Check Engine Light and the OBD-II code comes back, the HO2S sensor for the engine bank 1 and sensor 2, which is to the rear of the catalytic converter, is not sending the correct information to the ECM and may be damaged or defective. The sensor may have a bad internal heater element, or it could have a bad ground, a failed 12 volt battery input or connector.

It is quite rare if the ECM is defective. The ECM detects the O2 sensor heater circuit low current or an open circuit and will enter failsafe mode until the ignition is turned off. The failsafe mode will cause various drive complaints depending on the vehicle and manufacturer of the vehicle and ECM programming.

This failsafe mode will continue until the problem is repaired. Some of the common drive problems in failsafe mode can be hesitation, running rough, and low power. If it comes back, the mechanic should check both power and ground to the sensor including inspecting the wiring and sensor.

P0037 Subaru HO2S Heater Control Circuit Low Bank 1 Sensor 2

Many of the problems on this code are wiring-related due to the heat of the exhaust. Do not immediately replace the HO2S before checking all related wiring and the connector closely. The mechanic should ensure there is 12 volts to the sensor and the ground is good. Also, check both sides of the connector wiring to ensure the connector is good.

The vehicle can still be driven, but it should be properly diagnosed as soon as possible to prevent more issues like sensor loop errors, high fuel consumption, poor operation, or damage to other components. Have a certified technician verify the code with a scanner. Reset the fault codes and perform a road test. If the P code returns, then follow the test procedure. It can have several problems, but wiring being damaged by excessive heat from the exhaust is most common.

Make certain the wiring is good and has proper voltage and ground to the sensor before replacing the sensor. If there is no voltage present, repair the open or short in the 12 volt feed circuit by first determining if it is necessary to replace any fuse blown from the short.

If the battery feed is intact, remove the ground control circuit from the ECM wiring connector and check for resistance on the circuit. If there is infinite resistance, repair the open in the circuit.This page is for personal, non-commercial use.

P indicates that, for the engine to run correctly, the exhaust must have a specific air fuel ratio of If the code is cleared and reset, and then the Check Engine Light and the OBD-II code comes back, the HO2S sensor for the engine bank 1 and sensor 2, which is to the rear of the catalytic converter, is not sending the correct information to the ECM and may be damaged or defective. The sensor may have a bad internal heater element, or it could have a bad ground, a failed 12 volt battery input or connector.

It is quite rare if the ECM is defective.

p0037 code

The ECM detects the O2 sensor heater circuit low current or an open circuit and will enter failsafe mode until the ignition is turned off. The failsafe mode will cause various drive complaints depending on the vehicle and manufacturer of the vehicle and ECM programming. This failsafe mode will continue until the problem is repaired.

Some of the common drive problems in failsafe mode can be hesitation, running rough, and low power. If it comes back, the mechanic should check both power and ground to the sensor including inspecting the wiring and sensor. Many of the problems on this code are wiring-related due to the heat of the exhaust. Do not immediately replace the HO2S before checking all related wiring and the connector closely. The mechanic should ensure there is 12 volts to the sensor and the ground is good.

Also, check both sides of the connector wiring to ensure the connector is good. The vehicle can still be driven, but it should be properly diagnosed as soon as possible to prevent more issues like sensor loop errors, high fuel consumption, poor operation, or damage to other components.

Have a certified technician verify the code with a scanner. Reset the fault codes and perform a road test. If the P code returns, then follow the test procedure. It can have several problems, but wiring being damaged by excessive heat from the exhaust is most common. Make certain the wiring is good and has proper voltage and ground to the sensor before replacing the sensor. If there is no voltage present, repair the open or short in the 12 volt feed circuit by first determining if it is necessary to replace any fuse blown from the short.

If the battery feed is intact, remove the ground control circuit from the ECM wiring connector and check for resistance on the circuit. If there is infinite resistance, repair the open in the circuit.

If the control circuit checks out, suspect a bad O2 sensor. Replace and re-check. Having experienced this problem in the past, the most common problem is damage to the sensor wiring, either from improper installation or the wiring clamps failing causing the wires to touch the exhaust system, including the catalytic converter which is the hottest part of the exhaust.

The rear sensor is most likely to be removed or exposed to physical damage during work on the exhaust or driveline which creates many potential problems. If the wiring on the sensor itself is damaged, do not try to repair it as it most likely will not work properly. In these cases, just replace the sensor. Many vehicles with mileage overhave momentary sensor problems that usually occur during start up or prolonged stress situations on the drive train.

If the Check Engine Light comes on and the vehicle seems to be operating normally, the OBD-II system can be reset using the scanner and the problem may not reoccur.Discussion in ' PT Cruiser ' started by george wOct 14, Allpar Home News Forums.

Help Repairs Part sources Resources. News News News forum Upcoming cars Test drives. Forums Stories Car shows Clubs Facebook. Allpar Forums. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More. Joined: Jul 31, Messages: 1, Likes: Just over K miles. Bought new and serviced regularly. Car is running fine as always.

I have noticed no difference in performance or the way the engine runs. Apparently this is a common problem but I have not been able to find the cause. I could find no fuse for the O2 sensors or heaters. I have seen mention of the ASD relay, but if the ASD relay were faulty wouldn't there be other issues like the car won't start or shuts down?

p0037 code

If I disconnect the battery the Check Engine light will go out for a brief period of running but it comes back on. The underside of the car is very clean and there are no signs of corrosion on anything.

Where do these sensors derive their power? Does anyone know if there's a specific or common ground connection for the O2 sensors and if so where would that be located. Should I look elsewhere for some other problem that's causing false codes?

Remove Advertisement. ImperialCrown Moderator. Joined: Jun 8, Messages: 20, Likes: 4, On a cold start, the PCM may apply almost full 'on' for fast warm-up to the heaters in order to get the car into closed loop operation ASAP.

How to Check and Replace an Oxygen Sensor (Air Fuel Ratio Sensor)

A voltmeter check can tell you if this is a PCM, wiring or O2 sensor issue. Some aftermarket O2 sensors Bosch? Set Condition: Desired state does not match Actual state. If power is supplied through the PCM then where is the grounding point? The O2 sensors are the originals by the way. Looking at the wiring diagram, it appears that the heater grounds are tied together at a single point an in-harness splice? The engine should then ground to both the battery and the body to reduce 'ground-loop' issues.

If the PCM isn't powering the heaters, look for wiring rub-throughs or pinches to ground before condemning the PCM itself. A battery disconnect may be needed to reset the PCM after a fault is removed. I'll have to take a closer look and take some measurements this weekend when I'll have the time and the car can be checked with the engine cold.

No need for burned hands and arms working in such close quarters! I suspect a possible ground issue since the problem appears to be affecting both O2 sensors at the same time and mutual failure is unlikely. The engine runs fine but is still setting the check engine symbol.


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