S-Class (W140) 1991-1999: 300 SD, S 350TD, 300 SE 2.8, S280, 300 SE 3.2, 300 SEL 3.2, S320, S320L, 400 SE, S420, 400 SEL, S420L, 500 SE, S500, 500 SEL, S500L, 600 SE, S600, 600 SEL, S600L, 500 SEC, 600 SEC

ECU help

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Old 09-30-2013, 12:39 PM
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1997 Mersedes S420
ECU help

Hello MB world family I fixing up my 97 s420 I think my ecm is bad can i buy one used with the same numbers will that work in my s420?
Old 10-01-2013, 07:26 AM
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yes seen them at EBAY,however you can first pull your ECM and check its fuses Read interesting story of a 1999 s500 that had crank sensor wire worn in two.

Last edited by oldsinner111; 10-01-2013 at 07:29 AM.
Old 10-01-2013, 12:02 PM
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I'll do that also but I crossed up the batt terminals I checked all the fuses it stars when I put gas in intake but no fuel injection work I checked everything I tried the obd scanner it won't even read the code error comes up and I read a lot of threads that said they had the same problem that it was the ecm I found one on ebay with same numbers do I have to get it coded or can I pop it in and pray the car starts?
Old 10-01-2013, 12:37 PM
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Not to sure on that by poping it in,you might try,but if it does not reconize the throttle body you must teach it.Benzworld.org has info on w140s

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