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1993 945 Turbo Check Engine codes? 900 1993

posted by  Chris Regensburger on  Tue Apr 12 04:39 CST 2005
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a bad fuel pump relay can cause the 121, if it cuts power to the control unit, it throws a code for that. Myself, I'd clean the throttle plate and adjust the associated stuff, TPS, kickdown cable. Clean the manifold grounds and install star-washers, this is all preventative stuff, but can cause those problems. Dirty t-plates usually cause a fuel trim code instead of a 121, but both can be a bad air mass meter. Clear the code, see what comes back, if anything.






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