Fault code P0041 – a step-by-step guide to diagnosing and fixing it

Error code P0041 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system has detected a fault in the lambda sensor heating circuit (bank 1, sensor 2). This DTC P0041 indicates a problem with the heating of the oxygen sensor after the catalytic converter. With various manufacturers, this trouble code can also be referred to as "O2 Sensor Heater Circuit Malfunction".

What causes can this error code have?

• Defective lambda sensor heater
• Damaged wiring to the oxygen sensor
• Corroded or loose plug connections
• Blown fuse in the heating circuit
• Defective engine control unit (ECU)
• Short circuit in the electrical cable
• Oxidized contacts on the sensor cable

What symptoms occur in parallel with fault code P0041?

• Increased fuel consumption: The vehicle requires more fuel than usual
• Poor exhaust values: Emission values deteriorate significantly
• Uneven engine running: Engine runs unevenly at idle speed
• Starting problems: Prolonged starting process, especially when the engine is cold
• Jerking when accelerating: Vehicle does not pull smoothly
• Check engine light: Permanent illumination of the warning light

How can the problem with fault code P0041 be rectified?

• Repairing fault code P0041 requires a systematic approach to identifying the defective component.
• Replacement of the defective lambda sensor and heating element with an original part or high-quality spare part
• Repair or replace the damaged wiring between the sensor and control unit with appropriate cables
• Cleaning and treatment of corroded plug connections with contact spray and subsequent sealing
• Checking and replacing the corresponding fuse in the engine compartment fuse box
• Professional diagnosis and, if necessary, replacement of the engine control unit in the event of irreparable damage
• Complete check of the heating circuit with multimeter and repair of short circuits or interruptions