January 30, 20206 yr From what I have read the MAF sensor can be the cause all of those codes. The main relay supplies power to the circuits that the codes point to, but you changed it. You may want to replace the MAF. At one yard I go to it is $25 if I pull it. I am about to order one from partsgeek, a Delphi for $155. Delphi says they make them for OEM. Earlier I said I replaced a new (cheap) one that lasted 3 months on our 97. When I went to the junk yard, I got 2 of them and replaced the defective new one with one of those. Just the other day I had to use the second one. I think I may have to investigate the circuit. Each time there was a loss of power, no code was ever set, no CEL. Fast acceleration or going uphill the car had no power and would not downshift on its own to maintain or increase speed. I checked a lot of things that could cause loss of power and then swapped the MAF and the power was back.
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