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

What it means

The downstream O2 sensor on bank 1 is reading low voltage for too long, which can mean a bad sensor or an exhaust leak.

Severity: Low

Can I drive it? Safe to drive.

Common causes (most likely first)

Faulty downstream O2 sensor
Exhaust leak near sensor
Wiring short

Likely fixes

Check for exhaust leaks
Inspect wiring
Replace sensor

DIY parts cost

$30–$150

Approximate estimate

Shop repair cost

$150–$400

Approximate estimate, parts + labor

DIY difficulty

Easy to Moderate

Varies by vehicle

Cost ranges are rough, approximate U.S. estimates and vary widely by vehicle, region, and parts brand. Always confirm the diagnosis before buying parts.

Parts you may need

Downstream oxygen sensorCheck price
O2 sensor socketCheck price

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