Serndipity

Although my 2001 CLK320's CEL has been on 6 months, the runs normally. However, with a CEL on, won't pass state inspection in MA next month. Codes are P0170 and P0173.

I have searched and read all the discussions and decided to try cleaning my MAF last weekend.

I removed the MAF and then took out the sensor insert to clean. The only thing visible was an electronic part that was a wire with a tiny glass cylinder in the middle (diode or termisitor). What I could not find was the coiled wire, metal plates etc. that have been discussed.

At the end of the sensor insert, there were some small square openings and there appeared to be additional metal objects inside. However, the openings were to small to get at them. So I attempted the cleaning by submersing the sensor in a container of denatured alcohol and shaking it. Reinstalled the MAF and the CEL remains on (manual says that it will go off after 3 complete cycles of normal operation).

The MAF is MB part # 112 094 00 48, Bosch # 0 280 217 515. BTW, the Bosch web site shows the # as 0 280 217 516 (w/ the word "new" added).

At the end, were the small square holes were, it appeared that there might have been a removable cover section. Since it didn't come off with reasonable force....the did the alcohol bath.

Any advise as to how this could have cleaned the sensor?

superstar

There is no way to clean the MAF . The only thing you can do is change it with a new one. "Sometimes even the new ones are not working ,because of bad storge" . Good luck

RobertG

get a new Maf then make another attempt to clean it, either it will work or it will get worse