P0037 Oxygen Sensor Heater Code? Here’s What to Check!

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The P0037 code means the Heated Oxygen Sensor Heater Control Circuit Low (Bank 1, Sensor 2) has a problem. In simple terms, the ECM has detected that the heater inside the downstream oxygen sensor isn’t working properly. That heater helps the sensor warm up faster so it can start reading accurately.

Oxygen Sensor Socket -