S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

Code P0101

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Old Mar 15, 2010 | 01:38 PM
  #1  
Joseph S Tann J's Avatar
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S320
Code P0101

I have a 1996 S320 with 175,000 miles I use for highway travel of about 1000 miles every two to three weeks. Just recently I had my CEL checked and the code read P0101 with a:

Defintion of "Mass or volume Air Flow sensor circuit";

Explantion of "Air duct tube damaged'; and

Probabe Cause of "Large vacuum leak on engine: and "faulty Mass sensor".

What does this mean? Is highway travel in particular advisable before fixing whatever the problem is? You may reply to tannj2@comcast.net if personal discussion is best. Thanks.

Joe
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Old Mar 15, 2010 | 03:11 PM
  #2  
TMAllison's Avatar
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Joined: Jun 2008
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From: Bay Area, CA
09' E320
Sounds like the lid or tubing exiting the air fliter housing is damaged allowing air to bypass the filter causing the MAF to become dirty, then ruined.

Having that code lit up usually causes the engine to go into limp mode, reducing power/efficiency.

Takes about 10 minutes to R&R the MAF. Part is ~$200 online for most models.
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