Hi Arthur,

I took my C280 back to the garage to find out why I got the CEL light and fuel trim message right away after installing the new MAF and the mechanic did several checks including the fuel regulator (checked with pressure gauge), vac leaks (didn't take the valve cover off) and several other checks. After an hour of diagnosis, he said he thinks the problem might be in the "chips or network". I got scared and asked him if he thought I would hurt the engine running it like it is and he said he didn't think so. He said he thought it would take another hour or two to diagnose the problem. ??????

Thanks for your help!

Biglar