P0308
11-05-2016, 02:48 PM
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2007 CLS550, 2006 E350 4matic
P0308
Hi, I have an 07 CLS550, 140K miles. Getting P0308. Rough at idle, no seeming lag under acceleration. Have swapped coil packs with cylinder 5, still get P0308. Have swapped out coil pack several times and rough idle comes back quickly. Takes a while (months) to get CEL back on. Injector? Plug? other issue? Thanks.
