Mass or Volume Air Flow Sensor A Circuit Low
What it means
The engine computer has seen a mass airflow (MAF) signal below the lowest acceptable level, meaning it reports far less air than the engine can actually take in. This is usually caused by a lost signal or power supply, and the engine may run with an inaccurate mixture.
Symptoms4
- Check engine light on.
- Stalling right after starting or at idle.
- Clear loss of acceleration.
- Rough running or hard starting.
Possible causes6
- Unplugged, loose or corroded sensor connector.
- Open circuit in the signal or power wire.
- Signal wire shorted to ground.
- Blown fuse in the sensor power circuit.
- Failed or heavily contaminated MAF sensor.
- Large air leak between the sensor and the throttle body (less common).
How to diagnose5
- Watch the MAF reading on a scan tool; a value near zero with the engine running means a lost signal or power supply.
- Inspect the connector and its pins and make sure it is fully seated.
- Measure power and ground at the connector and compare with the manufacturer specification.
- Check the signal wire for an open circuit or a short to ground.
- Inspect the intake duct for a disconnected or badly cracked section.
How to fix6
- Clean the connector pins and reconnect it firmly.
- Replace the blown fuse and find out why it blew.
- Repair the open or grounded wire.
- Repair any disconnected intake duct.
- Replace the MAF sensor if the circuit is good and the signal is still low.
- Clear the codes and confirm the sensor reading rises with engine speed.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
The cost is low for a connector, wire or fuse repair, and reaches the upper end when the MAF sensor is replaced.
Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026
Frequently asked questions
Why does the engine stall with this code?
Because the computer sees less air than is really entering, so it injects too little fuel, or it runs on a backup value that does not suit every condition.
Should I replace the sensor first?
No. Check the connector, wiring and fuse first, because a lost signal or power supply is a common cause of this code.
This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.
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