Air Flow Meter Performance
Indicates a problem with the air mass flow sensor reading.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The air mass flow sensor measures how much air goes into the engine. If it doesn't sense air correctly, the engine can't run efficiently.
What the computer is actually seeing
The ECM compares the air mass flow reading to expected values based on engine conditions. If the reading is out of range (too low or too high), it triggers the code.
What a healthy reading looks like
Normal operation usually shows a voltage between 0.5V to 4.5V with engine speed; at idle, expect around 1.0V to 1.5V, and at high RPM, up to 4.0V.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check wiring and connectors for damage or corrosion at the air mass flow sensor.
- 2Inspect the air filter for blockage; it should not be dirty or clogged.
- 3With a scanner, monitor the MAF sensor voltage while the engine runs. Voltage outside the 0.5V to 4.5V range indicates a problem.
- 4If voltage is out of spec, replace the air mass flow sensor and clear codes. If in spec, inspect for air leaks in the intake system.
Common causes
- Faulty air mass flow sensor
- Wiring issues or damaged connectors to the sensor
- Air intake leaks before the sensor
- Dirty air filter
- ECM software faults
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's drivable but may cause reduced engine performance and increased emissions, so fix it soon.
Will the code return after repairs?
If you've fixed any identified issues and reset the ECM, it shouldn't return unless there's another underlying problem.
Why does this code sometimes pair with other codes?
Multiple codes can indicate that an underlying issue affecting the air mass flow, like a vacuum leak, is impacting other systems as well.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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