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  1. Limp mode no CEL

    Mercedes-Benz CLA45 AMG
    I have had my CLA45 for 4 years now. Decided to install a downpipe and software update. It ran well for a month after the update then boom, Limp mode. This happened a day after i replaced my spark plugs, it well into Limp mode (P0299) after hard acceleration but no CEL. No other codes except...
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