I have an 2006 CLK350 and the "check-engine" light came on. My code reader shows a "$0280", but I'm unable to find what it's for. I've searched both "P0280 and 0280" and the P shows "cylinder 7 misfiring, but it's a 6 cylinder. Any help would be appreciated!

 

Google Search:

Error $0280: Unsupported protocol (i.e. no vehicle detected)

 

I tried another code reader and it shows P2188 and P2190 (too rich at idle). I've read the other threads on the new codes and checked the gas cap and air cleaner seal, but if it returns it may be a sensor.

 

Bad MAF sensor.