Mass Airflow Sensor Circuit Range/Performance

What it means

The mass airflow sensor measures the air entering the engine, and the computer compares this with what it expects from throttle position and engine speed. This code means the reading does not match, either because the sensor is dirty or because air is entering without passing it.

Symptoms5

• Sluggish acceleration and hesitation.
• Unstable idle.
• Occasional stalling after starting.
• Higher fuel consumption.
• Unusual transmission shifting on some cars.

Possible causes6

• Mass airflow sensor contaminated with dust or oil.
• Clogged or incorrectly fitted air filter.
• Air leak after the sensor, such as a cracked intake duct.
• Loose or corroded sensor connector.
• Failed mass airflow sensor.
• Over-oiled performance air filter contaminating the sensor.

How to diagnose and fix5

1. Inspect the air filter and housing and confirm correct fitment.
2. Clean the sensor with a spray made only for airflow sensors, without touching the fine wires.
3. Inspect the duct between the sensor and throttle body for cracks or loose clamps.
4. Check the sensor connector and wiring.
5. Compare the sensor reading with specification using a scan tool, and replace it if still implausible.

Repair cost

In Saudi riyals; the highlighted part is the expected range for this fault.

Cleaning or a new air filter costs very little, while the sensor itself may reach the second tier depending on the car.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.

Frequently asked questions