How to Clean or Replace the MAP/Boost Sensor on a BMW M57 Diesel

How to to clean or replace the MAP or also known as a boost sensor on a BMW M57. This particular car I am working with here today is a 2010 BMW 335d E90. A similar procedure can be applied to the BMW X5 diesel, 5 series, and 7 series of the same generation equipped with the M57. A faulty boost sensor will cause your car to go into limp mode. Under heart acceleration, cause a loss of power, reduce fuel economy, and trigger a check engine light. The BMW specific code which can be triggered in 429A. #oemtools #foxwell #BMWM57

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Tools/Supplies Needed:
-sensor safe cleaner
-OBD2 scanner
-5mm allen wrench
-8mm socket with screwdriver handle

Procedure:
To access the sensor, the engine cover will need to be removed. To remove that engine cover, the cowl in front of the windshield will need to be removed first. Remove the cabin filter cover, which is held on with six 8mm bolts, then lift off.

Next will be removing the two outer covers, these are simply snapped into place. Pull the tabs back and lift off the covers.

Next will be removing the two 8mm bolts holding on the windshield cowl.

The wire going across the top needs to be pulled out of its clips. We won’t be fully removing the cowl, just have it unbolted, so we're able to pull it up when putting the engine cover back into place.

Using an allen wrench, remove the five 5mm socket head bolts.

Use a clean cloth to wipe around the oil fill cap, then remove it. Lift the engine cover out of place then and place it somewhere safe. Reinstall that oil cap so nothing falls inside the engine.

The boost sensor is on top of the intake manifold towards the back under the cowl on the driver's side.

Depress the tag and then pull the plug off.

Then pull the sensor back-and-forth, gently, rocking it out of its grommet. You may or may not need to replace this grommet if it is dried out from the heat.

You can use a toothpick to clean out this port before washing it with a solvent. For cleaning the boost sensor, I would recommend a sensor safe base cleaner. Have a paper towel handy, this will allow us to see if there is any debris coming out of the small port.

Spray the cleaner inside the sensor and then flip it upside down, so the solvent drains out.

Gently, tapping the sensor on top of the paper towel might help dislodge any debris inside. The white paper towel also shows if any debris is being removed along with ensuring the solution is clean when emptying. Once no more debris is coming out, the sensor is then clean and ready to be reinstalled. I did let the sensor dry for a few minutes, so the solvent did evaporate.

Push the sensor back into place.

Then snap the electrical connector back into place.

Remove the oil fill cap.

Reinstall the engine cover. there are tabs on the backside which needs to lock into the rear cover. Lift the cowl and make sure everything is aligned correctly.

Reinstall that oil fill cap.

Reinstall the socket head bolts back into the engine cover.

Snap the wiring harness back into place.

Finally is bolting down the cowl. Make sure to line it up correctly, and install the two 8 mm bolts along the fender sides.

Reinstall the cabin filter and install those 8 mm bolts.

Snap the outer covers back into place

After that is clearing the engine codes, removing that boost sensor fault.

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