P00F2
Mass Air Flow Sensor A Circuit HighP00F2 is a generic OBD-II powertrain diagnostic trouble code: Mass Air Flow Sensor A Circuit High. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.
What P00F2 means
P00F2 is set when the ECM detects that the signal from the primary mass air flow (MAF) sensor circuit is above the maximum expected range. The MAF sensor measures the volume and density of air entering the engine, and its signal is fundamental to calculating the correct fuel delivery and ignition timing.
A circuit high condition on the MAF sensor typically results from a short to voltage in the signal wire, an open in the sensor ground or reference circuit causing the signal to float high, a failed MAF sensor element internally shorted to a power rail, or a contaminated sensor element providing an inflated reading. In some designs, a broken sensor housing that allows unmetered air to bypass the sensing element can cause the ECM to compensate in a way that triggers this monitor.
With an out-of-range MAF signal, the ECM may default to a speed-density or map-based fuelling strategy, resulting in rich running, poor throttle response, increased fuel consumption, and elevated emissions. Diagnosis should begin with circuit voltage checks before replacing the sensor.
Common causes
Most-frequently reported root causes when P00F2 is logged.
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1
Signal wire shorted to a voltage source in the harness.
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2
Open circuit in the MAF sensor ground or reference voltage line, causing the signal to float high.
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3
MAF sensor element internally failed with signal output at maximum.
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4
Contaminated or coated sensor element providing an inflated airflow reading.
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5
Water or oil ingestion into the sensor causing element damage.
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6
Damaged wiring harness near the intake where flexing causes intermittent shorts.
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7
Aftermarket air filter or intake modification affecting sensor signal.
Symptoms drivers notice
How to diagnose P00F2
A typical diagnostic flow when this code is present.
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1
Scan and record all DTCs, noting any fuel trim or O2 sensor codes that may confirm a rich condition.
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2
Inspect the MAF sensor wiring harness and connector for damage, corrosion, or shorts.
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3
Measure the MAF sensor signal voltage at the ECM connector with the ignition on, engine off.
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4
Check reference voltage and ground integrity at the sensor connector.
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5
Inspect the sensor element visually for contamination or oil coating.
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6
If wiring is intact and contamination is ruled out, substitute a known-good MAF sensor and retest.
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7
Clear DTCs and verify the fault does not return with the replacement sensor.
Related powertrain codes
Frequently asked questions
Can cleaning the MAF sensor fix P00F2?
If the high reading is caused by contamination on the sensing element, cleaning with an appropriate MAF cleaner may resolve it. Electrical circuit faults require wiring or sensor replacement.
Will P00F2 cause the engine to run rich or lean?
A high MAF reading tells the ECM there is more air than there actually is, potentially causing it to add excess fuel, resulting in a rich condition.
Can an aftermarket cold air intake cause P00F2?
Yes. Some aftermarket intakes expose the MAF sensor to turbulent or unmetered airflow, which can skew the signal high or low depending on the installation.
Is P00F2 the same as P0102 or P0103?
They are related but not identical. P0102 and P0103 are generic OBD-II codes for low and high MAF circuit, while P00F2 is a newer SAE J2012 code that specifically flags the sensor A circuit high condition under expanded diagnostic coverage.
Disabling P00F2 in software
RaceTune can permanently disable P00F2 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.
Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.
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