Fault code P0105 – a step-by-step guide to diagnosing and fixing it

Error code P0105 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system detects a fault in the intake air flow or manifold pressure circuit. This DTC P0105 indicates problems with the Manifold Absolute Pressure (MAP) sensor or the Barometric Pressure (BARO) sensor. For various manufacturers, this fault code can also be referred to as "Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction".

What can cause this fault code?

• Defective MAP sensor or BARO sensor
• Damaged wiring to the pressure sensor
• Corroded or loose plug connections
• Vacuum hoses leaking or blocked
• Defective engine control unit (ECU)
• Short circuit in the sensor circuit
• Mechanical damage to the sensor
• Contamination or blockage of the sensor openings

What symptoms occur in parallel with fault code P0105?

• Starting problems: The vehicle is difficult to start or does not start at all
• Irregular idling: Engine runs unevenly at idle speed
• Power loss: Reduced engine power, especially when accelerating
• Increased fuel consumption: Noticeably higher consumption due to incorrect mixture formation
• Jerking when driving: Engine jerks or stutters while driving
• Exhaust problems: Increased emission values or black smoke from the exhaust

How can the problem with error code P0105 be rectified?

• Repairing this trouble code requires a systematic approach to identify the exact cause.
• Replace the MAP sensor or BARO sensor completely, as these are often the main cause of code P0105
• Check all vacuum hoses and lines and replace defective or leaking hoses
• Clean the plug connections on the pressure sensor, check for corrosion and replace if necessary
• Measure the wiring from the sensor to the control unit with a multimeter and repair or replace damaged cables
• Clean the sensor openings with compressed air and remove any dirt
• Have the engine control unit checked and replace or reprogram if defective