Discussion Starter · #1 ·
I bought a 2000 Nissan sentra gxe about 5 years ago, ran great when I first got it but then it sat for 3 an a half years. The six months I’ve had it on the road it has been nothing but nightmares... started with the MAF sensor, mid pipe went, oil gasket and rear started leaking, one engine coil 2 months ago and the second last week and thats just the major (expensive) problems i've had. Two days after having the coil replaced I’m now getting the dreaded P0420 code and nothing I read about it online is good. The shop cleared it and told me fill up with some high octane and pray that I could burn off the smog from the misfire but after 20 miles the code is back. Anyone have any advice or experience dealing with P0420 after a misfire? Am I able to attempt to burn it off or am I just up the creek without a paddle? All the mechanic told me was if the light came back on and i wanted to pass inspection i'd have to replace the cat which I'm "looking at big bucks". With 118,000 miles on it and the money dumped into it over the last 6 months I'm not sure what to do here, am I pretty much screwed?