Mazda Mass Air Flow (MAF) Sensor | Symptoms | Repair

Symptoms

Here is a list of possible symptoms you may notice from a bad mass airflow sensor on a Mazda.

• Check engine light on
• The engine refuses to start 
• Engine dies after the start
• Poor fuel economy
• Engine idles to high or low

How to replace the mass airflow sensor on a Mazda

What you will need

• Mazda Air Flow Sensor
• + Screwdriver

Procedure

1. Let the engine cool down. Next, open the hood of the Mazda and disconnect the battery.

2. Locate the mass airflow sensor on your Mazda 5. The sensor is located near the engine air filter housing. 

3. Unplug the wire harness. Next, unplug the electrical connector from the Mazda mass airflow sensor.  

4. Remove the screws that hold the mass airflow sensor in place. 

5. Install the new MAF on your Mazda. Tight the screws so that they are snug.

6. Plug the electrical connector until it locks in place. 

7. Close the hood and start the engine. 

If the check engine light is on, don't expect it to turn off right away. If no other fault codes are present, the check engine light should reset within a week. 

If you want to check for other codes or reset the check engine light, use an OBD2 scanner to clear the fault codes. The OBD2 scanner can be connected to the diagnostic port located under the dashboard on the driver's side.  

Mazda Mass Air Flow Fault Codes

Possible fault codes that may be triggered by a bad mass flow sensor on a Mazda.

• P0101 MAZDA Mass Air Flow Sensor Inconsistent with Throttle
• P0102 MAZDA Mass Air Flow Circuit Low Input
• P1100 MAZDA Mass Air Flow Sensor Intermittent
• P0100 MAZDA Mass Air Flow Sensor Signal Out Of Range
• P0103 MAZDA Mass Air Flow Sensor High Input Signal
• P0171 MAZDA Lean Air/Fuel Ratio Bank 1
• P0172 System too Rich (Bank 1)
• P0173 Fuel Trim Malfunction (Bank 2)
• P0174 System too Lean (Bank 2)
• P0175 System too Rich (Bank 2)

Other DTCs not listed here may be related to the MAF sensor.