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  #1  
Old 09-06-2017, 08:42 PM
Bill '90 300E's Avatar
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Location: Greenville, NC
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W210 P170 & P173 Codes. Help!

I have an ongoing CEL situation with my 2000 E320. The codes suggest the MAF. I first tried cleaning the existing MAF to no avail and have since replaced the MAF with what appears to be a "good" replacement that I procured from the local pick 'n pull. I cleared the codes and installed the "new" MAF and drove the car for about 50 miles, shut it down for a half hour or so, started back up and no CEL. YES!!! Fixed...oh, but no. The CEL came back on again. I am due for state emissions inspection and this is becoming an exercise in frustration. In searching, some said the cure was in the MAF replacement, some with a gas cap cleaning or a new cap. A friend suggested that it may be a vacuum leak issue. I'm baffled and need to get an inspection. Any suggestions? Thanks in advance...

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1990 300E - Arctic White, Blue Leather (Eibach Pro Kit springs, Bilstein Sport Shocks, 16 X 7.5 8 Hole Wheels)

1999 E430 Sport, Brilliant Silver, Anthracite Leather (as of 6/17, it is a parts car. Let me know what you need)

2000 E320, Brilliant Silver, Anthracite leather
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  #2  
Old 09-07-2017, 12:04 PM
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It is always helpful to post the trouble code meanings. Service manuals have very specific trouble shooting procedures for each code. Also post why you feel the MAF is the problem.
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Old 09-08-2017, 08:25 PM
Bill '90 300E's Avatar
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P0170 "fuel trim bank 1", P0173 "fuel trim bank 2". I feel that MAF is the problem because it is a very common problem and many in this forum have had the same codes pointing to the MAF. Hope that helps...
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1990 300E - Arctic White, Blue Leather (Eibach Pro Kit springs, Bilstein Sport Shocks, 16 X 7.5 8 Hole Wheels)

1999 E430 Sport, Brilliant Silver, Anthracite Leather (as of 6/17, it is a parts car. Let me know what you need)

2000 E320, Brilliant Silver, Anthracite leather
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Old 09-09-2017, 08:31 AM
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An unmetered air leak could cause the fuel trim to push the system towards rich. Unmetered air is anything past the MAF.

High fuel pressure / liquid fuel leaking from pressure regulator to intake manifold could cause fuel trim to push towards lean.

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