OP, what test have they done other than a code scan, really needs an experienced person to handle star to get a root cause, I’d go and look at live values of pressures of the exhaust system to track back to the real problem
Mercedes-Benz Servicing, repairs, engine and diagnostics Wayne Gates - Mercedes-Benz, Unit F3, Phoenix Industrial Estate, Rosslyn Crescent, Harrow, Middlesex, HA1 2SP Tel: 020 8863 9233 Established for 20 years all vehicles washed and vacuumed.
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