Need some help with codes please!
Thread Starter
Safety Car
Joined: Oct 2004
Posts: 4,809
Likes: 236
From: Utah
Need some help with codes please!
My check engine light came on, so I checked the DIC and the following codes came up, PO420,PO430. The maual said TWC system low efficiency bank 1-A 2-A. Anybody know what these mean, and what I need to do? Thanks in advance!
Drifting
Joined: Jan 2005
Posts: 1,419
Likes: 16
From: Oceanside, CA
A member TXNC5 PM'd me this and it is invaluble information.
Go here www.gearchater.com
For PO420/430 Here http://www.gearchatter.com/viewtopic10342.php
Good luck! I hope this is what you need!
Go here www.gearchater.com
For PO420/430 Here http://www.gearchatter.com/viewtopic10342.php
Good luck! I hope this is what you need!
Pro
Joined: Oct 2004
Posts: 538
Likes: 0
From: Edmond Ok
P0420 & P0430
Originally Posted by rudolph schenker
My check engine light came on, so I checked the DIC and the following codes came up, PO420,PO430. The maual said TWC system low efficiency bank 1-A 2-A. Anybody know what these mean, and what I need to do? Thanks in advance!
I have the same codes coming up on my 96 tahoe. The guys at autozone say inefficient catilitic converter. I have not changed the cats on the tahoe yet, just run with the light on for now. The code numbers are the same discrip as you have. Tahoe has 140K miles. If yours has low mileage, try to clear the code and see if it comes back. Good luck
Thread Starter
Safety Car
Joined: Oct 2004
Posts: 4,809
Likes: 236
From: Utah
Thank you "Nick 02 Zo6" and "djengr" for the info! I just installed long tube headers and a GHL exhaust and have yet to get it Dyno-tuned, so I suspect the air-fuel ratios are a little off and might have caused this code. 
