I'm Back! (P0421 CEL Code)
So I'm back and the problem I'm now having is CEL code P0421. (Paragraph #5 of my original post below is what I think is causing the issue)
https://mirageforum.com/forum/showth...ctrical-Issues
I'm having the same exact issue as littlemoule had to a T. (Cylinder 1 was misfiring (for 2 weeks) and dumping fuel in the cylinder that wasn't getting consumed, it's possible the raw fuel being pushed into the catalyst could have degraded the efficiency/lifespan of the catalyst)
https://mirageforum.com/forum/showth...705-P0421-code
After Johnny Mullet fixed my corroded wiring harness back in February the car has been running great but the mpg's are now suffering (was getting 37-40 mpg highway prior...currently maybe 30-33 mpg?) and now the CEL (P0421) has been on since
I've tried the old Scotty Kilmer lacquer thinner in the gas tank trick to clean the cat but that did nothing.
https://www.youtube.com/watch?v=5icT...eSBraWxtZXI%3D
I just purchased two O2 sensor spacer/defoulers to try and trick the computer into turning off the CEL. Before I try it has that worked for anyone else before or should I just remove the front cat and clean it out real good with soap/water?
https://www.walmart.com/ip/2Pcs-O2-S...ole/1093527612
Also, How many O2 sensor's does the 2015 US Mirage have, two or three? Thanks
https://www.youtube.com/watch?v=0NM55ar7GSE