Fault code P0153 – a step-by-step guide to diagnosing and fixing it

Error code P0153 is displayed and the check engine light is on - what does this mean?

DTC P0153 is triggered by the OBD/EOBD system if the lambda sensor in bank 2, sensor 1 (before the catalytic converter) reacts too slowly to changes in the air/fuel mixture. This error code affects the engine management and exhaust gas purification. The designation may vary slightly for different manufacturers, but the problem remains the same.

What can cause this error code?

• Defective lambda sensor (O2 sensor) in bank 2, position 1
• Dirty or aged lambda sensor
• Damaged cable connections to the lambda sensor
• Defective plug connections on the O2 sensor
• Exhaust leaks upstream of the lambda sensor
• Dirty air filter
• Defective mass air flow sensor
• Clogged fuel injection valves
• Low fuel pressure
• Engine oil or coolant in the exhaust system

What symptoms occur in parallel with fault code P0153?

• Increased fuel consumption: The vehicle consumes more fuel than usual
• Unsteady idling: The engine runs unevenly at idle speed
• Loss of power: Noticeable reduction in engine power
• Poor exhaust emissions: Increased emissions during the emissions test
• Jerking when accelerating: The vehicle does not pull smoothly
• Starting problems: Delayed starting of the engine

How can the problem with error code P0153 be rectified?

• The repair requires a systematic diagnosis to identify the exact cause.
• Replace the lambda sensor in bank 2, position 1 and replace the seals at the same time
• Check the wiring harness and plug connections of the lambda sensor and repair or replace if damaged
• Check the exhaust system for leaks and replace defective seals or pipes
• Replace air filter and clean mass air flow sensor or replace if defective
• Check the fuel system, replace the fuel filter and have the injection valves cleaned
• Check engine oil and coolant for leaks and rectify any leaks