Have a dealer hook it up to the proper machine and really get the codes. Then you will know what the problem is.

I think its called SDS, Star Diagnostic System.

Friends S430 showed similer symptoms, turns out it was a coil. But said coil took out the cats somehow, so don't ignore it!

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200