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Replaced the MAF with a new genuine Bosch one from Rockauto, disconnected battery for ten minutes, and after a drive cycle the CEL came on and still reports 4 bad O2 sensors. No voltage swings from O2 sensors, Durametric shows -0.41 volts steady. The O2 heater resistance reports 4.1 ohms when the spec calls for 3.1 +/- 0.3 so I'm off a bit there but can't believe that's the problem. The front O2 sensors are brand new and idle is smooth.
I pulled the oil fill cap and still the fuel trims did not change nor did the O2 sensors vary their voltage.
What am I doing wrong? Would a bad DME do this? If I had a vacuum leak or fuel delivery problems I should see the fuel trim responding, right?
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