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Old 11-21-2005, 12:40 PM
3 MB's and counting!
Join Date: Apr 2001
Location: Toronto, Canada
Posts: 1,825
Procedures for changing MAS sensor on W202

I had the check engine light come on on my 99 C230K sedan last week. I had the codes read and MAS sensor was the only one that came up. I noticed ever since I got the car that it became more sluggish and not getting its full boost from the kompressor. Would the new MAS correct this? there a special procedure to put the new MAS in such as disconnecting battery to reset the ECU or do I just simply replace it?


99 C43
98 S420
99 C230K
01 C240
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Old 11-22-2005, 12:57 AM
Registered User
Join Date: Jul 2004
Location: NC
Posts: 1,140
FWIW, I've replaced more than one on my former VWs, same type of Bosch part. All I did was carefully remove the connector to it (gently open the release with a screwdriver) and unscrew the whole thing from the intake pipe. The hex screws are part of the assy and you dont remove those, ust remove the entire part from the intake (phillips). Shouldnt need to rset anything. I'm planning to replace mine soon as well due to similar issues.
former: 83 300D, 97 C230, 93 400E

current: 08 C300 Luxury , 92 500SL
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Old 11-22-2005, 10:32 AM
Ali Al-Chalabi's Avatar
Senior Member
Join Date: Nov 2000
Location: Knoxville, TN
Posts: 1,837
Its a real easy replacement.

Should not need to reset anything. After driving with the new one for a while, the car should be smart enough to figure that its not broken anymore.

Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record
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