Should I just drive it around til the code pops up again if it does. Can't really damage anything right.?

 

180miles and nothing has came back up.

 

So code came back after about 500 miles anyone have any suggestions???

Im sort of confused right now.

 

I had an SES light come on, so went to Autozone. They scanned for free, showed me the code, I think it was P0455? Said it was a gross emissions leak and had a list of 4 or 5 remedies. The last one was " loose gas cap". Checked and sure enough, I didn't tighten at the last fillup. So they cleared the code.

So, even if you have the scanner, might try getting another opinion from Autozone, or a similar parts store.

 

I created an account just so I could respond to this because I recently went through the same situation and wanted to help. I'm in college and can't exactly afford a new OEM cat. So I was looking into other ways to fix the problem. I started out resetting the code. No luck. Would come back on with 90-120 miles. Tried swapping O2 sensors to see if P0430 code would pop up. Nothing, still P0420, so that ruled out O2 sensors. I hooked a shop-vac to blow in the exhaust to see if there were any leaks. Nothing. So, I found a video on youtube by Scotty Kilmer that said to try putting lacquer thinner in the gas. Apparently the light goes off if the cat efficiency falls below 95%. So it could be at 94% and the SES light would turn on. I was skeptical, but I tried it anyway. 1,500 miles later and no light. Of course you run the risk of ruining the fuel components with lacquer thinner since it's a solvent, but if you're like me and can't afford a new cat, it's worth a try. Hope this helps.

 

Thanks for your reply I appreciate it. So how much thinner did you end up putting in the tank?

 

According to the video, 1 gallon of lacquer thinner for 9 gallons of gasoline. So, I waited until I was a little bit below half a tank and added it in since my sedan has a 20 gal tank.
I was very careful to run the entire tank through in as little time as possible. I was traveling a long distance, so I burned through the rest of the tank in about 3 hours. I put some fresh gas in to run through just to make sure all the plastics in the fuel pump and stuff wouldn't be exposed to the lacquer thinner for longer than needed. So far so good.

 

Also, Bank 1 is passenger side. It's correlates to the side that the #1 piston goes off in the engine firing order.