P0101 Code - Mass or Volume Air Flow Circuit Range/Performance Problem

What Does P0101 Mean?

P0101 is the general code for a problem with the Mass Airflow Sensor (MAS) operating range and/or an engine performance issue.

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What are the common causes of P0101?

• Faulty mass air flow sensor
• Intake air leaks
• Dirty mass air flow sensor
• Dirty mass air filter
• Mass air flow sensor harness is open or shorted
• Mass air flow sensor circuit poor electrical connection

How do you troubleshoot P0101?

With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio.

Process Tips

Diagnostic trouble code P0101 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before P0101.

Fortunately, P0101 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

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