What does code P0137 mean?

P0137 — Low input from Bank 1 Sensor 2 (downstream O2). This sensor is used to monitor the catalytic converter — readings are abnormally low. Belongs to the powertrain.sensor system. Severity: warning.

What are the common causes of P0137?

Failed Bank 1 downstream O2 sensor; Break in signal wire; Signal shorted to ground; Exhaust leak after the catalyst pulling in ambient air; Damaged sensor heater

Can I drive with code P0137?

Limited: reaching the nearest workshop is fine, but avoid long trips. May progress into a more serious fault.

How do I diagnose P0137?

Read the code and freeze-frame with a scanner, check related-system errors, inspect the components listed (wiring, connectors, sensors). See the "How to diagnose" section above for the full step-by-step.

How do I clear code P0137?

The code can be cleared via an OBD-II scanner (e.g. ELM327 + the Car Diagnostics app): plug the adapter into the OBD port, go to Errors → Clear. If the underlying cause isn't fixed, the code will return within a few drive cycles.

OBD-II Code P0137 — Car Diagnostics Platform

What it means

Common causes

Failed Bank 1 downstream O2 sensor
Break in signal wire
Signal shorted to ground
Exhaust leak after the catalyst pulling in ambient air
Damaged sensor heater
Aftermarket test pipe installed without O2 spacer/emulator

How to diagnose

01
Read all stored and pending codes with an OBD-II adapter — get the full picture, not just the one code.
02
Capture freeze-frame data (RPM, coolant temperature, engine load) at the exact moment the code triggered.
03
Inspect the named subsystem with our app's AI explanation — get vehicle-specific causes for your make, model and year.

Decode P0137 on your actual car

Plug in an OBD-II adapter and get an AI-powered diagnosis tailored to your vehicle make, model and year — in 30 seconds.

Try the demo