Mitsubishi's service engine soon, also known as a check engine light, can come on when the On-Board Diagnostic (O
Mitsubishi 'Mass Air Flow' (MAF) sensor may fail which in turn, triggers the check engine light (service engine soon) to stay on, the engine may start to shake and fuel consumption will increase.
In this step by step guide, you will find instructions on how to replace a Mitsubishi Mass Air Flow sensor yourself.
Common symptoms of a bad Mitsubishi Mass Air Flow sensor include:
- Check engine light on
- Poor starting
- Engine Surging
- Engine stalling
- No-start condition
- The engine starts then dies
- Rough idle
- Service engine soon on (some models)
- Park your Mitsubishi on level ground and set the parking brake(s).
- Pull the hood release under the hood. Prop the hood open.
- Locate the Mass Air Flow (MAF) sensor on the intake air duct.
- Remove the two torx bolts that hold the sensor in place. On some models, you will need to disconnect the air duct hose as the sensor comes as one unit.
- Press the electrical connector and pull to uplug it.
- Install the new MAF sensor and reconnonet the electrical connector. You should hear a click when the connector is fully inserted.
- Restart the engine.
- Your engine should now run smooth but the check engine light will remain on. If preferred use an OBD-II scanner to reset Mitsubishi check engine light (service engine soon).
If there are no other problems present, your check engine light will reset on its own.
This can take up to one week of normal driving. If your Mitsubishi check engine light has not reset within a week, read the codes with an OBD-II scanner.
The Mass Air Flow (MAF) sensor is a very important sensor on your Mitsubishi. It measures the temperature and volume of air entering the engine.
While the pictures in this guide are from a 2017 Mitsubishi Lancer, the procedure is almost identical for other models including Outlander, Galant, Mirage, Eclipse, Montero. The main difference is that the part number will be different.