Cadillac STS Forum - 2005 through 2012 Discussion, P0420 and P0430 in Past Cadillac Vehicle Discussion; Well was driving today and the CEL came on, scanner says P0420 and P0430 which means the cat(s) are shot. ...
Well was driving today and the CEL came on, scanner says P0420 and P0430 which means the cat(s) are shot. I know on these cars its a 3 way piece in the midstream, and there are cats on the manifolds. Which is bad, and think theyll give me any trouble because of my Corsa?
If it sets those codes then the cats are failing, did you clear them?
Have you fixed anything else recently that might have affected the fuel mixture?
Corsa shouldn't affect the warranty since the cats are before that, some dealers might complain but...
Those suck to do on the V8 because you have to replace the whole manifold.
Yes the coverage is 8/80 on Cats and the ECM.
Be sure they replace the gaskets between the heads and the manifolds. The cats come with new donut seals.
The last repair was a power steering pump about 2 weeks ago, since then I havent touched anything.
I cleared the codes at advance auto parts (thats how I was able to pull them) but the CEL came back on the ride home, turned around to run them again and of course it was the same two codes.
Yeah they don't look very fun to do at all, thank goodness for warranties haha.
Thank you ewill3rd!
Took it in two days later, new cats. No questions or even mention of my Corsa, they also noted my torque converter shudder and had to order that one, so looks like I'll be returning again soon.
Thanks again ewill3rd.
What options do I have if I am past warrenty on the cats? I am currently getting the p420 and p430 codes and have been for quite some time now, the o2 sensors are fine, the dealer told me $1900.00 to replace them about a year ago.
What about cutting the old cats off and have a muffler shop put on a couple of new hi flow cats?
Also the radar unit on the 1sg, have you had or herd of those having to be replaced, mine keeps saying clean radar and ive cleaned it thoroughly and removed the front grill and tested it without grill on with same results.
What would it run to have the dealer realign the radar unit? approx??
I believe the cats are part of the exhaust manifold and your options are very limited.
On the ACC, it's sure worth trying a recalibration but there have been some posts of similar trouble requiring replacement. I'd seriously consider a auto-recycler that warranties their used parts. Otherwise it's gonna get real spendy.
Angus, I'd replace with OE, but if you don't want to there might be options.
Check with D3, it seems like they have come up with something for the V8's.
They are part of the manifold on the N*.
I have repaired several "clean radar" messages with an aiming procedure and have yet to replace one.
Aiming is a real pan, probably looking at an hour plus labor at whatever your local labor rates are.