Tools needed:
- Flathead Screwdriver or similar for unclipping air box clips
- Pick or similar to disconnect MAF connectors and undoing air hose clamps
- 5MM Hex/Allen key
Begin by unclipping the air box metal clips, there’s a total of 3.
For the Passenger side there will be a harness clipped to the lower half of the air box, use your pick or flathead to unclip it.
For the driver’s side there should only be a single coolant hose clipped to the top lid, use the flathead to unclip it.
Remove the air filter caps and air filters themselves.
The MAFs are bolted to the bottom of each air box and coupled to the lower air pipes by a coupler with two clips
at this point, you only need to unclip the lower clamp to remove the lower section of the air box along with the MAF. Once that’s unclipped you can start to pull up and then disconnect the MAF connector once you start removing the airbox from the vehicle
remove the other clamp on the coupler and then remove the two 5mm hex bolts (m6x18 if replacement is needed) from each side. Take note of which side the connector is facing on each air box and when installing make sure it matches up. Make sure the airflow direction is pointed down from the housing(towards bottom of vehicle)
with the MAF removed, make sure the sealing o-ring is free of damage or tears, otherwise replace. Apply a very small amount of clean oil or lubricant to the o-ring and slide on the new MAF. Reinstall the two bolts.
Replace both clamps before reinstalling. You can use standard worm clamps if you’re unable to obtain new OEM clamps.
Reinstall in the reverse order as you removed, verify the connectors are securely installed. It is strongly recommended to replace air filters if the MAF is being replaced.
A MAF isn’t considered a wearable item but oil from the AOS system will eventually contaminate it and cleaning may or may not resolve so we opt for replacement. Proper diagnostics are required to validate if a MAF is failing, symptoms usually are erratic or inconsistent idle. Often times the throttle will adjust automatically to account for this so realtime data logging is needed to validate a failure.
OEM Bosch mass airflow sensors are available at euro2ner.com!
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