E46 mass air flow sensor problems update#
If I notice any changes to the running of the car as a result of this clean I will update this post to describe them. one can will likely last you the lifetime of your ownership). The whole procedure used around half the can to fully clean the MAF sensor, so it's good for two goes (i.e. Judging by the towel too it was a worthwhile procedure. Unfortunately I didn't get a photo of it after the clean, but it did look visually cleaner. I let the sensor dry completely (very important!) and then refitted it. You shouldn't remove the electrical elements from the plastic housing to clean them.ĭespite the MAF sensor looking fairly clean, the paper towel had quite a lot of dirt on it afterwards.
I laid out some paper towels and held the sensor unit in place over the top. However, now that it was off I might as well give it a clean.Īlthough this guide shows the 330d MAF sensor, the same method of cleaning can be applied to the 318d and 320d models too. There was a few small areas of dirt on the sensor but overall not bad. When removed you can see how much grime has built up, and surprisingly for this car, there wasn't much. Once these are removed, and providing the electrical connector has been unclipped, the MAF sensor unit just pulls away. If you're struggling to get to the bottom Torx, use a flexible extension (thanks for the tip Jonny Voon). Two Allen head bolts attach the MAF sensor to the intake ducting, and two Torx head screws hold the sensor to the air filter housing. Removing the MAF sensor on the M57 330d engine was actually quite easy, it's just a case of removing the plastic engine covers, air filter ducting and finally the MAF sensor itself. You need a specific cleaner when cleaning electrical components, anything else could damage the sensor or circuitry.Īfter searching around for MAF sensor specific cleaners, I settled on CRC Air Sensor Clean*. The cost of replacing the E46 MAF sensor ranges from £20 to £60, depending on where you source the part. I wasn't experiencing any of the above symptoms, but by cleaning the sensor it would hopefully prevent them ever occurring, or at the very least prolong the MAF sensors life. Before taking any parts off, check the condition of the wires going into the MAF sensor connector / plug, if they've gone bad they are likely to be causing the symptoms of your fault (thanks for the tip Andy C!) I'd recommend bypassing the E46's EGR valve if you find yours is clogged with carbon deposits. If you're experiencing these problems, you might want to check and clean your EGR valve at the same time.
Some of the symptoms of a faulty, or dirty, MAF sensor are:
After 124k miles, I thought mine could probably do with a spring clean. Most people shorten the name to MAF sensor, or even further to MAFS.
E46 mass air flow sensor problems full#
Having carried out a full service and cleaned out the EGR valve on my E46 330d, my last maintenance job was to clean the mass air flow sensor.
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