Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Hello,Such general symptoms are caused by electronic engine control unit detecting abnormal values from any of the engine sensors, which make the exhaust emissions exceed the allowed value. So the cause can be anything starting from clogged air or fuel filters to faulty engine control unit. It is necessary to have the fault codes read out with suitable diagnostic tool like Xentry/Star Diagnosis or Bosch KTS for example.