Fault code P0108 – a step-by-step guide to diagnosing and fixing it

Error code P0108 is displayed and the check engine light is on - what does this mean?

DTC P0108 indicates that the OBD system has detected too high a signal from the intake manifold pressure/mass air flow sensor (MAP/MAF). This error code indicates problems in the intake system which can lead to an incorrect air volume calculation.

What causes can this error code have?

• Defective intake manifold pressure sensor (MAP sensor)
• Damaged mass air flow sensor (MAF sensor)
• Clogged or dirty air filter
• Leaks in the intake system
• Defective wiring to the MAP/MAF sensor
• Loose or corroded plug connections
• Defective engine control unit
• Blocked vacuum hoses
• Faulty throttle valve

What symptoms occur in parallel with fault code P0108?

• Loss of power: The engine noticeably loses power and acceleration
• Uneven idling: The vehicle runs unevenly or stutters when stationary
• Increased fuel consumption: Consumption increases significantly
• Starting problems: The vehicle is difficult or impossible to start
• Jerky driving: Jerks occur especially when accelerating
• Exhaust problems: Black or white smoke from the exhaust

How can I fix the problem with error code P0108?

• The repair requires a systematic diagnosis of the intake system components.
• Replace the MAP sensor: Replace the defective intake manifold pressure sensor with a new original part and calibrate the system
• Clean or replace the mass air flow sensor: Clean the MAF sensor with special cleaner or replace it completely if it is defective
• Change the air filter: Install a new air filter and check the air filter box for debris
• Repair wiring: Check all wiring to the sensor for damage and repair or replace defective wiring
• Seal the intake system: Locate leaks with leak detection spray and replace damaged hoses or gaskets
• Clean plug connections: Disconnect all sensor plugs, clean the contacts and make sure they are firmly seated