What does code P0037 mean?

Q: What does code P0037 mean?

HO2S Heater Control Circuit Low (Bank 1 Sensor 2). P0037 means the engine computer has detected that the heater circuit inside the downstream oxygen sensor (Bank 1 Sensor 2) is drawing less current than expected when the heater is commanded on. The sensor's built-in heater is not getting enough voltage or current, so the sensor may not reach operating temperature quickly enough for accurate emissions monitoring.

DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P0037

P0037HO2S Heater Control Circuit Low (Bank 1 Sensor 2)

P0037 means the engine computer has detected that the heater circuit inside the downstream oxygen sensor (Bank 1 Sensor 2) is drawing less current than expected when the heater is commanded on. The sensor's built-in heater is not getting enough voltage or current, so the sensor may not reach operating temperature quickly enough for accurate emissions monitoring.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaFuel and air metering and auxiliary emission controls

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.