Faulty O2 sensor leak in exhaust close to O2 sensor; Short to voltage on O2 signal circuit; Open in circuit resistance caused by corrosion in connector

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

P0136 on Honda Civic FC: O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)

Short answer: P0136 means “O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)”. The car’s computer has found a fault in the Emissions system and turns on the Check engine light (MIL). First check: read the code and live data with an OBD-II scanner.

Standard OBD-II code Same meaning on all cars (SAE J2012). Not checked against this car’s factory manual.

Code: P0136
System: Emissions
Dashboard light: Check engine light (MIL)
Applies to: Generic OBD-II meaning. Not every code is used by this car.
Confidence: medium (generic OBD-II definition, not checked against the factory manual for this car)
Source: obd-codes.com

Symptoms and when it is set

Check engine light on
Misfire, depending on O2 sensor position when sticking

Likely causes

Faulty O2 sensor leak in exhaust close to O2 sensor
Short to voltage on O2 signal circuit
Open in circuit resistance caused by corrosion in connector

What to check, in order

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

Related on this car

Same code on other cars

← P0135 P0137 →

Clearing the code does not fix the fault. If it comes back, the problem is still there. For brakes, airbags and steering, see a trained mechanic.