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Old 11-21-2003, 03:27 PM
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Join Date: Dec 2001
Location: Chicago
Posts: 13
Did search, still have CEL question

As the title states, I did a search in both the tech help and hot rod forums and still have some questions.

The car is a 1993 500E with a build date of 5/93. Yesterday, on the coldest day of the year so far, my check engine light came on. Besides the obvious question of what could it be?, I'd also like to know if my car is OBD I or OBD II, and if it is OBD I if there is a way to read the stored codes. On my old Chrysler minivan, you can watch the speedometer needle swing and tap out the stored codes. Anything similiar for this car?

Also, did MB tie any other diagnostic systems into the CEL, or is it strictly emissions related.

BTW, car has 62K miles, no stumbling or hesitation. Temp and oil pressure is normal for the car. Acceleration and cruising is normal.

Thanks in advance.

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Old 11-21-2003, 04:06 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Go to the DIY article on evaluating engine controls. It describes the impulse method of code retrieval. All the systems on that car can have their codes read using this technique.

There are code tables and pin locations of the 38 pin diagnostic connector in the archives.

Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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