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    CLK200 Emissions - MOT Failure - Running Rich

    Anyone come across this before? 1998 CLK200 Auto with 68,000 on the clock has just failed its MOT on emissions. CO and HC are way high and Lambda is low. Chap doing the MOT said it needed a new cat but I'm struggling to see why the cat would cause low lambda. I've pulled the plugs and...
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