I have a 04 GTP. Replaced the engine about 40K miles ago and has preformed without any issues. In the past 6 months, mileage has dropped from 21 to around 15. No codes listed, but the 2nd OS sensor (after the cat) was reading 0 V. wiggled the connectors and it seemed to come back online with readings between .1 and .8 or .9. I cleaned the MAF, made sure the ECT sensor was online. Hoping this is going to take care of the problem.
It's interesting to me that there are no codes...In two cases in the past when I've gotten on er, everything shuts down and I get the "Reduced Engine Power" message. Turn it off and on and it resets and is fine. Still, no codes. Any thoughts? I was having multiple misfires in the past but changed plugs and wires and they went away.
Also, where can I get a listing of stock Live Data Readings for this car? I'd like to go through the live data and see if I can find anyting out of line.
thanks much.. Brent