EZL/AKR or DI Module, check out my web page, MENU #5.

Yes, it stores faults and can incorrectly store faults that are not really there!! In fact, what started me to 'write' my "Mercedes S500 Cpe" page was the DI Module.

About a year or so after purchasing the car, the CE light came on and the fault was, you guessed it, the same as yours: Crankshaft position sensor defective (L5).

I did NOT replace it since it measured about 860 ohms and produced a valid signal. Remember, if the CKS sensor is really bad, the car won't run!.

The problem was located in the DI Module's fault memory. To explain this think of it as having a bad memory location where a "bit" is stuck on that just happens to indicate a bad CKS sensor when in actuality, it was not bad.

I found a used DI Module from a junk yard in NYC for $200! It's still in the car as of today.

This is not to say that you really didn't have a bad CKS but if the car was running, it would be hard to explain.

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Regards . . . . JimF
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'94 S500 Cpe

Visit my Mercedes Web Page