An ECM is possible, they usually employ separate ground drivers for each injector. It would be premature to suspect the ECM, without checking first that the circuits involved have good integrity. A simple continuity check of the ground circuit from #5 injector to the ECM might reveal a problem. Coincidentally, was the two 'bad' O2 sensors and the same bank that #5 cylinder is? Without fuel, that cylinder is basically an air pump, and that extra air makes an oxygen sensor read differently, and they are not necessarily faulty, just doing their job.
Thursday, January 27th, 2011 AT 3:36 AM