Fault code P0152 – a step-by-step guide to diagnosing and fixing it

Error code P0152 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected that the voltage of the oxygen sensor (lambda sensor) in bank 2, sensor 1 is too high. This DTC P0152 indicates a problem with the lambda sensor upstream of the catalytic converter on the opposite side of the engine. The designation of the engine bank can vary for different manufacturers, which is why exact identification is important.

What causes can this error code have?

• Defective lambda sensor (O2 sensor) bank 2, sensor 1
• Damaged or corroded cable connections to the lambda sensor
• Short circuit in the wiring of the oxygen sensor
• Defective engine control unit (ECU)
• Leaking exhaust system upstream of the lambda sensor
• Contaminated lambda sensor due to fuel additives or oil
• Loose or damaged plug connections
• Incorrect fuel mixture (too rich)

What symptoms occur in parallel with fault code P0152?

• Increased fuel consumption: The vehicle consumes more fuel than usual
• Poor engine performance: Reduced power and sluggish acceleration
• Rough engine running: Engine runs unevenly or jerks when idling
• Black smoke: Dark exhaust fumes from the exhaust pipe
• Starting problems: Difficulty starting the engine
• Check engine light: Permanent display of the check engine light

How to fix the problem of error code P0152?

• The repair requires a systematic diagnosis to identify the exact cause.
• Replace lambda sensor bank 2, sensor 1 completely, using the correct specification for the vehicle model
• Check all cable connections to the lambda sensor, repair or replace damaged cables and clean plug connections
• Check the exhaust system for leaks and replace defective seals or pipes upstream of the lambda sensor
• Have the engine control unit checked for defects and repair or replace if necessary
• Check fuel system and clean injectors to ensure optimum fuel/air mixture
• Test the entire wiring of the O2 sensor for short circuits and replace defective cables