I would like to tap into the collective wealth of knowledge on this forum. I have a 1998 C43, the CEL is illuminated and the diagnostic codes I have pulled are P0170 and P0173, fuel trim (left and right bank, respectively). What have you guys done to rectify these problems in the past. The car, aside from the CEL illuminated, drives fine. Thank you in advance, any help is greatly appreciated.

Change the MAF. It takes about 15 minutes to change and cost is about $250. This happened to me already.

What's your location? I may be able to help you change it if you need any assistance.

I ordered part and I'm waiting for its arrival thanks for reply. Easy job?

I just went through the same routine. In my case, with a '98 E320, 88,000 miles, I noticed that the lights came on in stop and go traffic, when I touched the brakes! I finally realized that the brakes had nothing to do with it, it was the low airflow to the engine when your foot was off the gas pedal. Apparently the MAM sensor sensitivity diminishes over the years and the situation is aggravated at minimum RPM. Slight fluctuations set off the CELs and ENGINE ELECTRONICS lights. Otherwise, our car continued to function perfectly normal. So, it had to be the MAM sensor. (I had even washed it three times, without an improvement.) Last week I bought a new Bosch MAM sensor that fits the 112 engines on eBay from mbfixers@msn.com for $158, S/H included. It arrived yesterday, I installed it, made several trips and NO MORE warning lights! This guy had 10 units to sell and sold only 6. He may still have some. But I see that you have a C43, is that with the V-8? Bosch makes different adapters for their MAMs for different installations. So be sure to confirm that it will fit.

Fritz...check my update.