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swiftj ... 5/31/2019

1995 GMC C1500 Sierra SLE 6 Cyl 4.30L


How do we fix a HO2S Heater Control Circuit Low (Bank 1, Sensor 2) of a car if Error Code P0037 is coming

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PartsAvatar Ca

PartsAvatar Ca 5/31/2019

What the P0037 code means?

P0037 indicate that, for the engine to run correctly, the exhaust must have a detailed air fuel ratio of 14.7 to 1 as resolute by the heated oxygen sensors (HO2S), which detect the oxygen satisfied of the vehicle exhaust. This in sequence is then sent to the Engine Control Module (ECM) to adjust the quantity of fuel deliver to the engine. An HO2S is heated to ensure very fast data transmission to the ECM's closed loop system, which helps control emissions during start up and when the engine is cold or warming up.

What causes the P0037 code?

1. Burnt wiring caused by wiring that runs too close to hot exhaust components

2. Short circuits caused by burnt wiring

3. Bad connections caused by corrosion, or impact damage caused by road debris

4. Bad ground connections

5. Low battery voltage

6. Blown fuses on the heater control circuit

What are the symptoms of the P0037 code?


Common mistakes when diagnosing the P0037 code?

Technicians report substitute of oxygen sensors, when lean or rich engine situation are the cause of incorrect readings, is fairly ordinary. Replacement of the wrong oxygen sensor is also a option.

What repairs can fix the P0037 code?

The most ordinary potential maintenance to address the P0037 code are as follows:
1. Have a certified technician verify the code with a scanner. Rearrange the fault codes and do a road test.

2. If the P0037 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 sure the wiring is high-quality and has proper voltage and ground to the sensor previous to replacing the sensor.


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