Here are the likely causes:
* Faulty MAF Sensor: This is the most common cause. The sensor itself might be dirty, damaged, or simply failing. Cleaning it (carefully, with MAF sensor cleaner – never use anything else!) is often the first step. If cleaning doesn't work, replacement is usually necessary.
* Dirty Air Filter: A severely clogged air filter restricts airflow, causing inaccurate readings from the MAF sensor. Replacing the air filter is cheap and easy.
* Wiring Issues: Problems with the MAF sensor's wiring harness, including loose connections, broken wires, or corrosion, can disrupt the signal to the PCM. Inspect the wiring carefully.
* Vacuum Leaks: Leaks in the intake system can also affect airflow and lead to an inaccurate MAF reading. These leaks can be harder to find and may require a professional diagnosis.
* Intake Manifold Problems: Rarely, issues with the intake manifold itself (cracks, etc.) can disrupt airflow and trigger the code.
Troubleshooting Steps:
1. Check the Air Filter: Replace it if it's dirty.
2. Clean the MAF Sensor: Use a MAF sensor cleaner and follow the instructions carefully. Let it dry completely before starting the engine.
3. Inspect the Wiring: Look for any damage, loose connections, or corrosion in the MAF sensor wiring harness.
4. Check for Vacuum Leaks: This is more advanced and may require a smoke test by a mechanic.
If cleaning the MAF sensor and checking the air filter and wiring don't resolve the issue, the MAF sensor is likely faulty and needs replacement. It's advisable to get a replacement MAF sensor from a reputable parts supplier to ensure it's compatible with your specific vehicle. After replacing the sensor, remember to clear the trouble code using an OBD-II scanner.
