P0101

Documented for: 2.0L gasoline; 2.5L/3.0L gasoline · System(s): EMS EOBD, EMS OBD II · Factory MIL flag: 2 · Default action: ECM Default: –Default air mass used –Adaptive fuel metering inhibited –Catalyst warm up ignition retard inhibited –Canister purge inhibited –Maximum engine speed reduced

Common causes

• Blocked air cleaner Air intake leak Engine breather leak Throttle control malfunction MAF Sensor to ECM sensing circuit: high resistance, intermittent short circuit to ground MAF Sensor supply circuit: high resistance MAF Sensor failure
• Large vacuum leaks
• Split Intake Air Boot or PCV Hose
• Defective intake manifold gaskets
• Mass Airflow Sensor (MAF)
• Mass Air Flow Sensor circuit problems
• Defective MAF sensor
• Defective manifold gaskets

Quick checks

• Confirm freeze-frame and conditions when the code set
• Inspect connectors, grounds, and harness for the circuit named in the code
• Compare live sensor values vs expected (unplugged/biased sensors are common)
• Check intake boots, PCV, and vacuum lines for splits (very common on aged X-Types)

Typical fixes

• Check for vacuum leaks
• replace MAF sensor
• inspect intake boot
• Check vacuum lines
• clean/replace MAF