2000 ML 320 , after the check engin light came on i went to Autozone and had the guy hook an OBD which indicated mulit missfire codes on bank A,i took the car to the dealer they kept the car for 3 days and said they don't
know what causing the missfire code. any advice would be apprciated.

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124Bill

Ignition system problem..air mass leaning out the mixture....or perhaps a cayalyst failure blocking the exhaust.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

thanks Doc. for the reply, but is it that hard for the dealer to not isolate the
specific componant that is failing. they said that they checked the spark plugs
and the coils .

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124Bill

NO, I would have the exhaust back-pressure checked...has your ML had a catalytic converter recall?

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator

i have owned the car for 9 months , but according to the dealer the recall
was done on this car about 2 years ago.

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124Bill

Take it out and drive it like a rental. If it's got a clogged, or partially clogged catalyst, you"ll start losing cylinders at high RPM/load.