Results 1 to 15 of 15
Thread: Car is throwing a code???? p0420
-
09-25-2005, 04:36 PM #1
- Join Date
- Aug 2005
- Location
- Coronado, CA
- Age
- 39
- Posts
- 76
white- 2001 Trans am
Car is throwing a code???? p0420
Well, I dont know where to start or what to do. My car is running pretty good. Nothing has changed that I know of. It seems to run alittle rougher but that might be my imagination.
The code has determined that the catalyst system efficiency for bank 1 is below threshold for the current engine operation conditions. (Bank 1 identifies the location of cylinder #1, while bank 2 identifies the cylinders on the opposite bank)
Anyone know what happened? I changed my plugs and wires about 500 miles ago. The only other thing that I can think of that went wrong is my car hesitated to start a couple of times awhile back but hasnt done it in about a week. I would turn the key and nothing would happen for like a second or two. But then it would just start up.
I dont know, maybe the cats need to be changed, o2 sensors?????
I need help.
-
09-25-2005, 06:20 PM #2
- Join Date
- Aug 2005
- Location
- Texas Department of Corrections
- Posts
- 18,128
- Retired Outlaw Sum Bitch
That code can be anything from running to rich to a loose wire...it will be a matter of elimination.... here.... http://www.wellsmfgcorp.com/counterp...v7_i3_2003.pdf
This is my signature. It is mine. Nobody else has one like it.
-
09-25-2005, 07:40 PM #3
it didn't say in that article what was wrong with the yukon...do you know sarge? I have that same code and am thinking about replacing the cat...until i read that. I already replaced the o2's...what can make the motor run rich?
-
09-26-2005, 08:35 AM #4AtmusGuest
alot of things can make a motor run rich, low voltage on the MAF, bad 02 sensor reading lean, leaky injector, fuel pressure to high, tune, dirty air filter, restriction on intake side.
-
09-26-2005, 09:52 AM #5
- Join Date
- Jul 2005
- Location
- Jacksonville, FL
- Posts
- 2,723
I'd swap the rear 02's from side to side and see if you get P0430 for the passenger side, if you still get P0420 then it's probably the cat. Remember they're covered under the Fed Emissions Warranty for 8 yrs/80K.
-
09-26-2005, 11:02 AM #6
- Join Date
- Aug 1999
- Location
- Arizona
- Posts
- 51,360
Black- 383 Procharged & N20 Vert
Sounds like a cat.
-
09-26-2005, 05:29 PM #7
- Join Date
- Jul 2005
- Location
- Earth
- Age
- 47
- Posts
- 3,365
414 RWHP 395 RWTQ- 00 Black Ram Air Trans Am
P0420 was my cat, drivers side. I had both replaced for free under 8/80k emissions law by dealer
-
09-26-2005, 06:14 PM #8
Its the cat inefficiency code, rear O2 sensors should be fine.
-
09-26-2005, 07:53 PM #9
if I bring mine to the dealer for the fed emissions warrenty, do you think i should put my stock intake back on?
-
09-26-2005, 08:15 PM #10
It wont matter to some dealers, but if it was me, I would just go through the trouble of putting it back on. Good luck.
-
10-23-2005, 02:28 PM #11
- Join Date
- Oct 2005
- Location
- Philadelphia
- Posts
- 13
Black/Black- 2000 TransAm WS6
I had the same problem a little while ago. Checked a bunch of stuff - sensors, wires, etc., but it turned out to be my catalytic converters - first the right side went - got that replaced at 76,000 miles, then the left went at 78,700 miles. Fortunately, both converters were still under warranty (warranty is good for 80,000 miles) so they didn't cost me a nickle to get them replaced.
-
10-23-2005, 07:34 PM #12Originally Posted by KillerWS6
-
11-07-2005, 01:24 PM #13etuckerGuest
I just got the same code today.......I have a 10 pound nitous bottle between the back seats. There is no way for me to remove all of the lines and intake. Will this be a problem?
-
11-09-2005, 08:20 PM #14
- Join Date
- Aug 2005
- Location
- Los AngeleSS
- Age
- 41
- Posts
- 96
Light Pewter Metalic- 01 Camaro SS
Originally Posted by SeVeReDiStOrTiOn
-
11-10-2005, 10:51 AM #15
I'm in Wa. and my dealer said it's 8yr/80,000 I have the same code, but want to be sure before the dealer gets it.
Thread Information
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
Similar Threads
-
p0420 code help me
By ws6ws6 in forum Firebird / WS6Replies: 9Last Post: 08-24-2012, 03:18 AM -
P0420 code
By KahanaReef in forum External EngineReplies: 8Last Post: 09-20-2010, 03:08 PM -
P0420 code!
By bluefields88 in forum General HelpReplies: 20Last Post: 07-08-2010, 07:07 PM -
Please Help with code P0420
By Mac500r in forum General HelpReplies: 10Last Post: 06-03-2006, 01:08 PM -
Car is throwing a code???? p0420
By white01ws6 in forum Western MembersReplies: 5Last Post: 09-26-2005, 05:46 PM
Bookmarks