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AS the service bulletin says the problem is in the ECU's chip program. MB screwed-up & should have recalled as many of these cars fail emission testing! At out dealer we notified our customers & installed REMAN ECU's when they were still under warranty. MB stopped with the reman/exchange units as soon as they were all out of warranty!
The throttle body can stay in the car for cleaning, only the air mass sensor & connecting rubber boot have to be removed. WE use a fine scotch-brite pad & air intake cleaner, make sure to wear rubber gloves. I always vacuum out all of the crud before starting.
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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
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