OBD-II TROUBLE CODE GUIDE
P0101: Mass or Volume Air Flow Circuit Range/Performance
The measured airflow does not agree with the engine computer's expected value.
What P0101 means
The measured airflow does not agree with the engine computer's expected value.
Common possible causes
- Intake leaks after the airflow sensor
- A contaminated or faulty mass airflow sensor
- Restricted air filter or damaged wiring
What to check first
Record all stored and pending codes and freeze-frame data before clearing anything. Inspect relevant wiring, connectors, hoses, fluid levels, and obvious damage. Use vehicle-specific service information and test the affected system before purchasing parts.
A code is not a parts order. Several faults can create the same code, and replacing the component named in a code description may not correct the underlying problem.
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