My Service Engine Soon light came on a few days ago out of the blue. Got codes ran and it came up with P0430? What does that mean?

What's wrong with my car?

Thanks!

 

down stream o2 sensor, http://www.obd-codes.com/p0430#

 

IMO more likely the passenger side cat - search P0430. What year/mileage? Might be covered under the GM extended warranty.

 

All that means is its time for headers and no cats.

 

$140K, and 2002 year and bought it in 2002

 

HELP. I just got this code, my car backfires on deceleration (when I let off the gas), and I have gutted cats (temporarily). What could cause this? How can it be fixed?

 

You have 900 posts, you hijack a thread and you don't know why you are getting this code with gutted cats? wow.

 

It seems like p0430 could be a fouled/failing post-cat o2 sensor OR a lack of cats where the rear o2's haven't been tuned out. If you remove the cats or have them tuned out by a shop or a friend with HPtuners, it will not affect driveability (unless the cat is clogged, in which case you can replace it or switch to longtubes), just how well it will pass the sniffer at a smog station. "Time for headers and no cats" doesn't help much if you don't need/want headers, and would prefer to have cats. You'd still have to have the code tuned out or buy O2 simulators.

Way to help me and/or the OP. I'd refer to you as an expletive but that's not cool to insult people. Just because I have 900 posts doesn't mean I know all there is to know about F-bodies, have a wife and kids, eight GM vehicles, have rebuilt engines and transmissions in all of them, and can build my own trophy trucks from scratch. It just means I post a lot, and attempt to help a lot of people. This engine setup is the first setup I have run without cats (yep, my friends and I swapped the engine in because it came with an L36), and the rear o2's had been previously tuned out by a friend. I was having issues with his tune so I had another friend load up the base tune for my car and tweak it to remove basic stuff - but he didn't remove the rear o2's as I told him I had NIB OEM GM cats in a box waiting to go in. The kind of **** you just posted does not help anybody except you and your ego. Here's why this code happened for me:

I had a friend recently change the tune on my car and he set the rear o2's to be active (again, I have no cats, on the last tune the rear o2's were tuned out). At the time of my post I assumed the rear o2's have some sort of effect on my primary issue, which was backfiring on decel (it's sort of disconcerting). The P0430 code has nothing to do with my primary issue of backfiring, which seems to be caused by a bad pre-cat O2 sensor OR an exhaust leak (which I do have).