Identify Symptoms of a Failing Mass Airflow Sensor (MAF)

• • Unstable idle
• • Poor fuel economy
• • Check engine light comes on
• • Difficulty starting the vehicle

Tools and Materials Needed

• • Socket wrench set
• • Replacement mass airflow sensor (if needed)
• • MAF sensor cleaner
• • Screwdrivers
• • Protective gloves and goggles

Inspect the MAF Sensor

• • Locate the MAF sensor, which is usually located between the air filter and the engine's intake manifold.
• • Check for visible damage or loose connections. Ensure all associated wiring is intact and free from corrosion.

Clean the MAF Sensor

• • Disconnect the negative battery cable to ensure safety.
• • Carefully remove the MAF sensor from its housing.
• • Use a MAF sensor cleaner to carefully spray the sensor. Avoid touching the sensor wires.
• • Let the sensor dry completely before reinstalling it.

Reinstall and Test

• • Reinstall the MAF sensor and reconnect any electrical connectors.
• • Reconnect the negative battery cable.
• • Start the engine and observe any changes in performance or check engine light status.

Replace the MAF Sensor (if needed)

• • If cleaning the sensor doesn’t resolve the issue, consider replacing the MAF sensor with a new one.
• • Purchase a compatible MAF sensor specifically designed for the Hyundai Elantra.
• • Install the new sensor by reversing the removal process.

Perform a Test Drive

• • Start the vehicle and allow it to reach its normal operating temperature.
• • Take the vehicle for a short drive to confirm the repair has resolved the issue.
• • Monitor for any Check Engine Light reappearance or other symptoms you initially identified.

By following these steps, you can diagnose and address mass airflow sensor issues in a 2001–2006 Hyundai Elantra. Regular maintenance, such as cleaning the MAF sensor, can prevent future problems and ensure the vehicle performs optimally.