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I have error code 25 (knock sensor or ECU). I have replaced the knock sensors, cam position sensor, plugs, wires, and coils. Car runs great but I still get error code 25. I can clear it but will come back.
 

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'95 E300 DIESEL, '91 600SEL, '92 600SEL
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Has the dreaded eco junk wiring disaster been addressed? If not, all bets are off and there is even the odd chance that code is bogus.
 
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