Cars Specification

1. Open the hood of your Mercedes and locate the mass air flow (MAF) sensor, mostly found between the air cleaner box and the air intake pipe of more modernized engines.
2. Unfasten all of the clamps that hold the air filter box to the intake hose and disconnect completely. Remove the air filter inside and thoroughly clean this area of any dirt that may have built-up over the extensive use of your Mercedes. This step is not imperative to removing and replacing the MAF sensor, but it will certainly help improve the functionality of the new sensor once installed. Replace the air filter if necessary, but leave the air box disconnected at this time.
3. Use the necessary socket to remove the bolt that holds the clamp of the air intake pipe. Remove this piece to free the intake pipe.
4. Pinch both sides of the MAF sensor and wiggle free until you have completely removed this part from the engine. Be patient, as this may take a few moments of your time to loosen.
5. Compare the old MAF sensor that you just removed with its replacement counterpart. Make sure both sensors match identically and replace the new MAF sensor exactly as the new one was removed. It should slide on very easily, with little wiggling to set into place.
6. Reconnect all of the parts that were removed to access the MAF sensor and clean the air filter box. Make sure all bolts are tightened properly to hold the intended clamps together, ensuring that the air intake tube and air filter box both are set exactly as they were before removal and installation of the MAF sensor.

1. Open the hood and disconnect the negative battery cable from the battery. Loosen the clamp nut with a wrench and pull the cable off.
2. Lift one corner of the BMW up with a jack. Place a jack stand under the BMW and lower the vehicle onto the jack stand.
3. Remove the lug nuts from the tire with a lug nut wrench. Pull the tire off.
4. Remove the black box behind the wheel column. Loosen the mounting bolts with a socket wrench and pull the box out.
5. Pull the tabs on either side of the speed sensor. Pull it out and disconnect the wiring harness underneath it.
6. Connect the wiring harness to the new BMW speed sensor and put it in place of the old speed sensor in the black box.
7. Reattach the black box with the socket wrench. Put the tire back on the BMW and secure it in place with the lug nut wrench. Use the jack to lower the vehicle to the ground. Repeat for all tires that need to have the speed sensor replaced.