P0037 - Heated Oxygen Sensor (HO2S) Heater Circuit Low Voltage Bank 1 Sensor 2

About Trouble Code P0037

Engines need a specific air to fuel ratio to run appropriately. This ratio is measured by the Heated Oxygen Sensors, when the engine’s computer receives data that is incorrect it will cause trouble code P0037 to occur. The sensor is heated to ensure quick data return to the computer, this helps control emissions while the engine is cold.

Symptoms of Trouble Code P0037

Common complaints of trouble code P0037 are rough running, hesitation and an overall lack of power. When the computer notices that the O2 sensor heater circuit is at a low current or an open current it will enter a failsafe mode that can cause these driving complaints.

Causes of Trouble Code P0037

There may be a bad heating element within the sensor or there may be a bad ground. There could be corrosion or damage to the wiring from the Heated Oxygen Sensor for engine bank 1, sensor 2 to the engine’s computer. In rare occurrences, there have been problems with the engine’s computer.

How to Fix Trouble Code P0037

Always check the validity of the trouble code by clearing it, driving the vehicle, and confirming the trouble code resurfaces. If it does, you may be dealing with several problems. Start with the wiring, replace any you find to be corroded or that have obvious damage from heat. After checking the wiring, you will want to check and possibly replace the sensor. You may need to replace a blown fuse, which may have been caused by a short. Check the voltage, if there is none you will need to repair the open or short in the circuit feed. If it all looks good, remove the ground circuit from the computer wiring connector and see if there is any resistance. Infinite resistance means you need to repair the open circuit. If it looks ok then you probably have a bad O2 sensor and you will need to replace it.

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