Fault code P0136 – a step-by-step guide to diagnosing and fixing it

Error code P0136 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in lambda sensor 2 (bank 1). This DTC P0136 indicates a problem with the downstream oxygen sensor, which is located after the catalytic converter. The designation may vary for different manufacturers, but the function remains identical.

What causes can this error code have?

• Defective lambda sensor 2 (bank 1)
• Damaged cable connections to the oxygen sensor
• Corroded or loose plug connections
• Defective heating of the lambda sensor
• Short circuit in the wiring harness
• Damaged catalytic converter
• Contaminated or poisoned oxygen sensor
• Defective engine control unit (rare)

What symptoms occur in parallel with fault code P0136?

• Check engine light: The check engine light is permanently illuminated
• Increased fuel consumption: The vehicle consumes more fuel than usual
• Poor exhaust values: Increased emissions during the emissions test
• Uneven engine running: The engine runs unevenly at idle
• Loss of power: Noticeable reduction in engine performance
• Jerking when driving: Especially at constant speed

How can the problem with error code P0136 be rectified?

• Repairing trouble code P0136 requires a systematic approach to identify the cause.
• Replacement of the defective lambda sensor 2 (bank 1) with an original part or a high-quality spare part
• Repair or replace damaged cables between the engine control unit and oxygen sensor
• Clean and secure all plug connections in the area of the lambda sensor
• Check and, if necessary, replace the fuse for the sensor heater
• Complete wiring harness diagnosis with multimeter to identify short circuits or interruptions
• Catalytic converter check and, if necessary, replacement if the sensor is damaged
• Engine control unit diagnosis and software update or replacement in the event of electronic defects