Have been having an intermittent (not very often) check engine light on the 1990 300E I just acquired. Since it's OBD1, Autozone and the like can't read the codes for free. I had hoped the car would have a built-in pulse counter so I could read the codes that way, but I don't think it does. All I see by way of a diagnostic module is a little black box with holes numbered 1-16.

I've been doing lots of searching on the forum but still not sure what to do. Can someone point me in the right direction.

Have spent virtually all my time over on the diesel forum....this is my first foray over to the gasser side!

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 157k miles
06 E320 CDI "Rutherford", Black on Tan, 175k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 70k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife