BlackNiteWS6

iTrader: (2)

I had this code come up on my car. Is this code usually a bad rear O2 sensor or is the cat. bad itself?

2001WS6Vert

It's almost always the cat.. Should be covered by the 8yr./80k warranty.

BlackNiteWS6

iTrader: (2)

Well, i still have a problem. As i post earlier i have a P0430 code. So i took it to the dealer yesterday and they replace both passenger side O2's and the cat. Drove 5 miles from the dealer and BAMM the SES light came back on. Drove back to dealer, they scanned it with Tech 2 and the 0430 code came back. What the heck else can cause this? I told the dealer i want the PCM either replaced, or erased then re-flash with a new stock file. Just wanted to know who's seen this?

Den

WS6Drop

iTrader: (10)

Its common with longtube headers and cats. All you need to do is get O2 sims or tuned out.

Cruz28

If you have headers you will need the tune. I have headers, cats and all four oxygen sensors. Get the tune instead of the sims that way you fix the problem and drive back home with more power. I got rid of my PO420 & PO430 codes and gained 20hp and 19tq with a dyno tune.

2xLS1

iTrader: (25)

Your sig says FLP headers. How did a dealer replace a FLP cat? It also says LS1 Edit. Just turn the codes off with it. Or is this on a different car?

Cruz28

I didn't look at his sig before I typed what I thought was a good way to go, strange he didn't take care of this already with LS1 edit.