- Engine runs rough
- The engine is hard to start or stalls.
- Check engine light is on.
- A decrease in fuel economy
- Porsche goes in limp mode.
What you will need
- Park the Porsche. Turn off the engine and set the parking brakes. We recommended disconnecting the battery.
- Access the engine compartment. Pull the hood release to open the hood. On a Porsche Boxster, put the convertible top in the service position, then remove the engine cover.
- Locate the mass airflow sensors. On this Porsche Cayenne, there are two mass airflow sensors mounted on the air intake hoses. On the Boxster, the sensor is located on the driver's side right after the air filter housing.
- Press the connector tab, then pull it away from the sensor. Do not pull on the wires, or you may damage them. If the connector does not come off, make sure you are pressing on the backside of the connector.
- Remove the T20 Torx screws. To remove these screws, you will need a Secure 5-point Torx bit. Note that the 5-point secure Torx bits are harder to find, and a 6-point secure Torx bit which is easy to find but does not work. These screws can also be removed with pliers in emergency situations.
- Remove the mass airflow sensor. If needed, pry out the old sensor with a flat-head screwdriver.
- Install the new sensor. Pay attention to the arrow that shows the direction of airflow. If you are cleaning your existing Porsche MAF sensor, make sure to spray it with a Mass Air Flow Sensor Cleaner.
- Tighten the Torx screws. If the screw holes don't line up correctly, remove the Porsche MAF sensor and rotate it 180 degrees.Porsche MAF sensor fits in only one direction.
- Connect the electrical connector until you hear the connector click. Check the plug to make sure it doesn't come out easily.
- Start the engine and pay attention to engine performance. If your check engine light is on, it may take a few days for the light to reset on its own. Or you can use an OBD-II scanner to clear the codes immediately.
Replacing or clearing the Porsche MAF sensor is a straightforward procedure that takes less than twenty minutes. For this procedure, you must have T20 Secure Torx Bits.
Before you clean or replace a Porsche mass airflow sensor, read the Diagnostic Trouble Codes (DTC) with an OBD-II scanner to confirm the problem.
Cleaning Porsche Mass Air Flow Sensor
Cleaning a Porsche mass airflow sensor has shown mixed results.
Porsche (MAF) sensor may get dirty and send incorrect data to the ECU.
If the sensor has failed internally or the film is damaged, cleaning it will not fix the problem.
Why do Porsche MAF sensors fail?
Porsche mass airflow sensors fail due to dirt that collects on the thin film used to detect airflow and temperature.
Oiled air filters are known to coat the MAF film causing it to malfunction.
Bosch vs Porsche OEM MAF Sensor
Bosch makes the OEM mass airflow sensor for the majority of Porsche vehicles.
Buying a Bosch MAF sensor online or buying it directly from the Porsche dealer is acceptable as long as they fit your Porsche.
The problem Porsche owners have is when a non-OEM sensor is installed. Porsche vehicles may not run optimally with a non-OEM sensor.
This is a list of possible fault codes that often point to a defective Porsche mass airflow sensor.
- P1124 - Oxygen sensing adaptation range 1 (cyl. 1-3) at enrichment limit.
- P0102 - Oxygen sensing adaptation range 2 (cyl.. 4-6) at enrichment limit.
- P0103 - MAF (Mass Air Flow) sensor or VAF (Volume Air Flow) sensor high input
- P0174 - System Too Lean (Bank 2)
- P0113 - High voltage signal from the intake air temperature sensor.
- P2281 - Air Leak Between Mass Airflow (MAF) Sensor and Throttle Body
- P0101 -MAF Circuit Range/Performance
- P1133 -Oxygen sensor, adaptation, lower load bank two above limit.
- P1126 - O2 sensing range 1 cyl 4-6
- P1128, P1130
This is a list of fault codes that could be related to the MAF sensor. It doesn't mean that these codes are only caused by a bad or dirty Porsche mass airflow sensor.
These codes may also be caused by vacuum leaks, bad oxygen sensors, engine misfire, etc.