Mazda Mass Air Flow (MAF) Sensor | Symptoms | Repair
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Learn about the symptoms of a bad Mass Airflow sensor (MAF) on Mazda vehicles and how to replace it yourself. When a Mazda’s mass airflow (MAF) sensor fails, the check engine light will turn on, and several performance issues will be noticed.
At a Glance
- Symptoms: check engine light, hard start or stalling, rough or high idle, poor fuel economy
- Common codes: P0100 to P0104 (MAF circuit), plus lean codes P0171 and P0174
- Try first: clean the sensor with MAF cleaner and check for intake leaks after the sensor
- Tools: screwdriver or socket, MAF cleaner, new sensor if needed
- Confirm: compare live MAF readings at idle and under load
Symptoms
Here is a list of possible symptoms from a bad mass airflow sensor on a Mazda.
- Check engine light on
- The engine refuses to start
- The engine dies after the start
- Poor fuel economy
- Engine idles to high or low.
Mazda Mass Air Flow Fault Codes
A bad mass flow sensor on a Mazda may trigger possible fault codes.
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Featured in The Wall Street Journal
- 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.
What you will need
- Mazda Air Flow Sensor
- Phillips screwdriver
Procedure
- Let the engine cool down. Next, open the hood of the Mazda and disconnect the battery.
Locate the mass airflow sensor on your Mazda 5. The sensor is located near the engine air filter housing.
- Unplug the wire harness. Next, unplug the electrical connector from the Mazda mass airflow sensor.
- Remove the screws that hold the mass airflow sensor in place.
- Install the new MAF on your Mazda. Tight the screws so that they are snug.
- Plug the electrical connector until it locks in place.
Close the hood and start the engine.
If the check engine light is on, don’t expect it to turn off immediately. The check engine light should reset within a week if no other fault codes are present. If not, follow this guide on troubleshooting the Mazda check engine light.
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 under the driver’s dashboard.
How to tell if the mass airflow sensor is bad on a Mazda?
When the mass airflow sensor fails, your Mazda will not accelerate properly; it may misfire and trigger the check or service engine light. To confirm that the MAF is the problem, always read the fault codes using an OBD2 scanner.
Can I clean the Mazda airflow sensor?
Yes. You can clean a Mazda airflow sensor using an Air Flow Sensor Cleaner. No guarantee cleaning will fix the problem. Cleaning is successful in cases when the sensor has gotten dirty.
How much does a new Mazda air flow sensor cost?
At the dealership, it will cost anywhere from $200 to $300. The MAF sensor can be bought online for as low as $50.
Can I replace the MAF on a Mazda myself?
Yes. It is one of the simplest Mazda DIY repairs. If you are starting with DIY auto repair, this will be an easy task to get started.
Where is the Mass Air Flow sensor located on a Mazda?
It is located on the engine air filter housing or the large-diameter air intake hose that connects the air clear box to the engine intake manifold.
Step-by-step instructions on how to change the mass airflow sensor on a Mazda. These instructions include pictures and video clips to help you with this Mazda DIY repair.
Check Engine Light Still On
If you need to reset the check engine light after you have replaced the mass air flow sensor, you can use the YOUCANIC Full System Scanner to clear the stored codes and remove the check engine light on your Mazda. This scanner also can read and clear codes through every control module of your vehicle, if it is supported.
Frequently Asked Questions
Can a vacuum leak look like a bad MAF sensor on a Mazda?
Yes. Air entering after the MAF sensor is not measured, which causes lean codes and rough running. Check the intake boot and hoses before replacing the sensor.
Will unplugging the MAF sensor tell me if it is bad?
On many engines, if the engine runs better with the MAF unplugged, the sensor is likely faulty. Clear the codes afterward.
Do I need to reset anything after replacing the Mazda MAF sensor?
Clear the codes. The engine computer relearns fuel trims as you drive.
My check engine light came on. My 2010 madza 3 mass air flow sensor showed to be bad. I had a new one put on and within 3 hours the light came back on. We cleared the computer and again the light came back on. It still showed the air flow censor. Thought maybe I got a bad censor so I replaced it with another new one. Light went off but came back on a few hours later. Still showed the same sensor. Now my car is surging and stalling and even dieing on me. I can’t figure it out. Any suggestions?
Press hard on the tab then pull.
How to unplug the wire wire harness form the MAF sensor? I can’t get it off.
Regards
Great article. I got quoted 280 from the dealership to charge the MAF on Mazda 6. Can t believe I am going to save $200. 🙂