What P0100 means
Mass or Volume Air Flow Circuit Malfunction
Common causes (general)
Before spending money on parts, verify the code with a scan tool and read freeze frame data. Freeze frame captures every sensor value at the moment the code set — this is often enough to figure out the root cause without further testing.
Manufacturer-specific descriptions
Different manufacturers use this code for slightly different failure modes. Here's what your specific make means by P0100:
| BMW | Mass or Volume Air Flow Circuit |
| FIAT | Diagnosis electrical signal flow meter, |
| FORD | Mass Air Flow Circuit Malfunction |
| MITSUBISHI | Mass or Volume Air flow Circuit Malfunction; AFS |
| NISSAN | Mass or Volume Air flow Circuit Malfunction |
| VOLKSWAGEN | MAF Sensor Ckt. Insufficient Activity |
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