P0100 — Mass or Volume Air Flow Circuit Malfunction
The ECU detects a general electrical malfunction in the mass air flow (MAF) sensor circuit. The signal is missing, out of plausible range, or the wiring shows continuity issues. Used as a generic fault when no more specific MAF code applies.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Mass air flow sensor
- Maf wiring
- Maf connector
- Intake duct
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- MAF sensor element contaminated (oil, dust)
- MAF wiring or connector damaged
- Mass air flow sensor failed
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.