I recently put on a full 3" exhaust, down pipe and one piece up pipe/UEL header. Two days after the install my 03 2.0 wrx died in the middle of an intersection. It will run but anything past 1/4 throttle/2k RPM seems to bog the motor. Now it wont run long enough to get it out of the driveway. With my accesport I pull all of these codes,
p0500 vehicle speed sensor
p1518 starter switch circuit low input
p1591 neutral position switch circuit low input
p0136 O2 sensor circuit malfunction
p0132 O2 sensor circuit high voltage
p0131 O2 sensor circuit low voltage
I just purchased a new downstream O2 sensor. It will be in within the next few days. I also priced the upstream O2 sensor, $240, money that I dont want to have to spend. Will my problem be solved with the downstream? Can I clear all of the non O2 codes without any problems? And with the new uppipe can I delete my EGT? Will this cause any problems and will there be anything else that Ill need to do after deleting? Thanks for reading!