MasterTuning Fault code dictionary (DTC)

P0102 — Mass air flow sensor: signal too low

Severity: Warning Can you drive? Yes, no known limitation Make: All makes (OBD-II standard)
MeaningThe air flow sensor reports a value below the expected minimum. The engine keeps running on a substitute estimate, which is where the rising consumption and falling power come from.
FamilyPowertrain (P)

Typical symptoms

Reduced power
Higher fuel consumption
Unstable idle
Black smoke on diesels
Engine warning light on

Common causes

Dirty or badly fitted air filter
False air leak downstream of the sensor
MAF fouled with oil, typical of oiled sport filters
Aged sensor out of calibration
Broken wiring

What to do

Filter and hoses first: a leak after the MAF gives exactly this code and costs a clamp. Then compare measured air flow against expected at full load: if it stays low with everything else in order, the sensor is worn out.

Frequently asked questions

What does code P0102 mean?

Mass air flow sensor: signal too low. The air flow sensor reports a value below the expected minimum. The engine keeps running on a substitute estimate, which is where the rising consumption and falling power come from.

Can I keep driving with code P0102 active?

Yes, no known limitation

Common causes — P0102

Dirty or badly fitted air filter False air leak downstream of the sensor MAF fouled with oil, typical of oiled sport filters Aged sensor out of calibration Broken wiring

How do you fix code P0102?

Filter and hoses first: a leak after the MAF gives exactly this code and costs a clamp. Then compare measured air flow against expected at full load: if it stays low with everything else in order, the sensor is worn out.

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