What does code P0136 mean?

P0136 — O2 Sensor Circuit (Bank 1, Sensor 2) — downstream sensor malfunction. Belongs to the powertrain.sensor system. Severity: warning.

What are the common causes of P0136?

Aged downstream O2 sensor (post-catalyst); Broken or shorted sensor signal wire; Failed sensor heater circuit; Exhaust leak between catalyst and sensor; Corroded sensor connector

Can I drive with code P0136?

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

How do I diagnose P0136?

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 P0136?

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 P0136 — Car Diagnostics Platform

What it means

Common causes

Aged downstream O2 sensor (post-catalyst)
Broken or shorted sensor signal wire
Failed sensor heater circuit
Exhaust leak between catalyst and sensor
Corroded sensor connector

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 P0136 on your actual car

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