P0137 – O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)

System

Emissions

Dashboard light

Check engine light (MIL)

Check-engine blink code

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Applies to

Generic OBD-II meaning. Not every code is used by this car.

Description

O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)

Detection / symptoms

1.Check engine light on 2./ Service Engine Soon) illumination

Possible causes

1.Faulty o2 sensor Exhaust leak near the rear sensor 2.Plugged catalyst 3.Short to voltage on O2 signal circuit 4.High resistance or open on O2 signal circuit 5.Engine running very rich or lean 6.Engine misfire condition 7.Fuel pressure very high or low - fuel pump or pressure regulator

What to check

1.Read the code and live data with an OBD-II scanner 2.Look for exhaust or vacuum leaks and check the wiring of the sensor or valve 3.Test the part before replacing it 4.Fix the cause, clear the code and test-drive

Confidence

medium (generic OBD-II definition, not checked against the factory manual for this car)

Generic OBD-II meaning (obd-codes.com), not checked against this car's factory manual. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights

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