I have a 2000 E430 4-matic. Today the "Check engine" light came on during a short trip to town. I checked the OBD 11 port and got the codes P0170 & P0173 which my generic codes says are Fuel Trim bank 1 & Fuel Trim bank 2....what is the M/B description for these codes.....prior to the trip today the car has been in the garage and I thought I smelled gasoline.....after the trip I smelled 'rotten eggs" (sulfur) ....I checked the gas tank cap it appeared to be tight and gasket ok...any help would be appreciated...BTW I did check the archives and got no real help there...

Thanks...

that usually means the MAF sensor is bad. TS a '99 E320 last week w/ 60k miles that had the same codes. Replaced the MAF and it's good to go.

But it seems as though these go bad much more frequently than the older MBs.

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Regards . . . . JimF
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'94 S500 Cpe

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An update on this item....I found one of the spring clips on the MAF sensor was not engaged and allowed a possible air leak...could this cause the problem?....I erased the codes and ran the car with no "check engine" light reappearing on the first run...also no "sulfur" smell coming from exhaust....hopefully the loose clip was the problem

Thanks for your help...