Fault code P0068 – a step-by-step guide to diagnosing and fixing it

Error code P0068 is displayed and the check engine light is on - what does this mean?

DTC P0068 is triggered by the OBD/EOBD system when a correlation fault is detected between the mass air flow sensor (MAF) and the throttle position sensor (TPS). This error code indicates that the measured values of both sensors do not match the expected engine load conditions.

What can cause this error code?

• Defective mass air flow sensor (MAF sensor)
• Damaged throttle position sensor (TPS)
• Dirty or clogged air filter
• Leaks in the intake system
• Defective throttle valve or throttle body
• Damaged or corroded cable connections
• Faulty engine control unit (ECM/PCM)
• Vacuum leaks in the hoses
• Blockage in the intake manifold

What symptoms occur in parallel with fault code P0068?

• Loss of power: The engine shows significantly reduced power when accelerating
• Irregular idling: The vehicle runs unevenly or stutters when idling
• Increased fuel consumption: Consumption is noticeably higher than usual
• Starting problems: Difficulty starting the engine, especially in cold weather
• Jerking while driving: The vehicle jerks or stutters while driving
• Engine stalling: The engine stalls while driving or idling

How can the problem with error code P0068 be resolved?

• Fixing the P0068 error code requires a systematic diagnosis of the components involved.
• Clean or replace the mass air flow sensor if the measured values are out of specification
• Check throttle position sensor and replace if defective
• Check air filter and replace if dirty
• Check the intake system for leaks and replace damaged hoses or seals
• Clean the throttle body or replace if mechanically defective
• Check all cable connections and plugs of the affected sensors for corrosion and tight fit
• Check vacuum lines for cracks or leaks and replace defective parts
• Check the engine control unit for software errors and reprogram if necessary