Magnified

Had the CEL come on for about a day to a day and a half. Appears to have been triggered by a misfire on a few cylinders. Did not seem to be running rough to me at the time however. Light went off on its own, before the shop got a chance to look at it. Is this a prelude of things to come? Any ideas what the deal is?

Thanks,

LR

m4xm1l10n

Bad coil maybe !!!

Oxygen

Code will not dissapear unless someone cleared it... The CEL might come off but a shop equipped to diagnose MB cars will have the ability to look into stored past events to determine what the cause was exactly.

blas0827

mass air

ajkennedy

Are you sure you were running 91 octane? I hate to admit it, but I have cut a corner once or twice with 87 octane and got the CEL along with rough running engine, hesitation at acceleration - although very slight. After a refill with 91 and about an eighth of a tank, the CEL went off (on its' own) and all was back to normal.

Vadim @ FD

Which engine?

V8 or V12?

Magnified

Engine as V8; 93 octane. Result = mass air flow meter (or whatever they call it on MBs). Swapped it out, no problem now. Emissions were fried with it screwing up - would not have passed inspection (which is coming up very quickly). Tried some contact cleaner on the MAF but it did not remedy the problem (in the past, I've has some luck with simply cleaning the filaments on other vehicles).

Thanks all for the responses.

LR

benz_addict

this is exactly the reason Why I clean my MAF sensor every 5000 miles with a reliable MAF cleaner! I've been doing this for the last 50k miles and no problems yet!