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Throwing Oxygen Sensor Related Codes

This is a discussion on Throwing Oxygen Sensor Related Codes within the External Engine forums, part of the LSx Technical Help Section category; I have an ses light on, and just got my computer read. It is thowing both P0420 and P0430 codes. ...

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    Senior Member GULLETT17's Avatar
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    Throwing Oxygen Sensor Related Codes

    I have an ses light on, and just got my computer read. It is thowing both P0420 and P0430 codes. Autozone's computer says this means bank 1 and 2 are below threshold for current engine operatings conditions??? What the hell does this mean? Does this mean both of my cats are bad or just the o2 sensors? I'm planning on purshasing lt headers and off road y in the near future, so would it be safe to ignore this until then? Also, is there any common shops that usually have the capability to delete the rear sensors, because I dont know of any around here.
    Last edited by GULLETT17; 09-09-2008 at 10:48 AM.
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    Senior Member GULLETT17's Avatar
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    in related thread i saw orion mention that gm waranty on the cats are ten yrs. . . should i try this first? even tho i "plan" on gettin the headers and off road y

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    It's more likely bad cats than 02's. Your choice I guess, won't cost you anything but a little down time to have the dealer replace them. Guessing you don't have to worry about emissions.

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    Senior Member GULLETT17's Avatar
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    Quote Originally Posted by 2001NBMZ28 View Post
    It's more likely bad cats than 02's. Your choice I guess, won't cost you anything but a little down time to have the dealer replace them. Guessing you don't have to worry about emissions.
    ya im kinda hopin it is the cats . . . nope no emission testing here.

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    Yo Da Lin The Valley..... astyles's Avatar
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    mine was reading the same......i changed cats,but i have other issues so i have not got to see if the lite stays off yet.....i can say i saw nothing physically wrong with the cats.....

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    Senior Member GULLETT17's Avatar
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    Quote Originally Posted by astyles View Post
    mine was reading the same......i changed cats,but i have other issues so i have not got to see if the lite stays off yet.....i can say i saw nothing physically wrong with the cats.....
    hmm. . . ill prob go ahead and try this first then.

    Now . . this may not mean anything and I may sound dumb with this, but my tips get really black, fairly quickly, so in turn making me wonder if shes runnin rich. so could this be a factor in this whole situation? i know the front o2 can control air fuel ratio.

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    2001 ws6 6-speed david_viny's Avatar
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    I had those two codes and new cats got rid of them. I got them under that warranty too!

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    Senior Member GULLETT17's Avatar
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    Quote Originally Posted by david_viny View Post
    I had those two codes and new cats got rid of them. I got them under that warranty too!
    good deal!!! looks like thats what i definately need to try first!

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    Junior Member Pushead's Avatar
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    I had that problem earlier this spring. The two things I did to fix it:

    1) Lucas fuel system cleaner / lubricant

    2) I cleaned the Mass Airflow Sensor. Since I use a K&N, sometimes the oil ends up coating the little wires, and causes problems with the AFR. They make a cleaner designed for MAS for like $5.

    Between the two, it fixed my errors.

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    Senior Member GULLETT17's Avatar
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    Quote Originally Posted by Pushead View Post
    I had that problem earlier this spring. The two things I did to fix it:

    1) Lucas fuel system cleaner / lubricant

    2) I cleaned the Mass Airflow Sensor. Since I use a K&N, sometimes the oil ends up coating the little wires, and causes problems with the AFR. They make a cleaner designed for MAS for like $5.

    Between the two, it fixed my errors.
    really? and yours was readin these codes too? may have to do this tonight

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    Yo Da Lin The Valley..... astyles's Avatar
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    maybe seafoam could help it too........i think my cats may have been clogged but not burned out

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    Junior Member Pushead's Avatar
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    Quote Originally Posted by GULLETT17 View Post
    really? and yours was readin these codes too? may have to do this tonight
    Yep same codes. I think it was still running a bit lean, but before I had a chance to hook it back up to a wideband O2, I had a valve hit a piston, and tore the engine apart. The two problems aren't related, don't worry.

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    Junior Member ricefordiner's Avatar
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    so you dont have to be the original owners to get the cats swaped by the dealer guys?

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    2001 ws6 6-speed david_viny's Avatar
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    Nope, as long as you have the codes show up and you're in the time/mileage bracket you should be able to get new ones. If the dealers say they have never heard of it ask them to check for it in their computer system if they didnít already. I had to explain to them what it was and they were pretty skeptical lol, then they looked and found it.

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    Junior Member ricefordiner's Avatar
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    my service engine light is on when i went to chek it it came out as both the first oxygen sensors on bank 1 and 2 are either runnig too lean or rich? is that enough evidence for them to change the cats fo me!

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    Quote Originally Posted by david_viny View Post
    Nope, as long as you have the codes show up and you're in the time/mileage bracket you should be able to get new ones. If the dealers say they have never heard of it ask them to check for it in their computer system if they didnít already. I had to explain to them what it was and they were pretty skeptical lol, then they looked and found it.
    Federal emissions warranty is 8 years or 80k miles (whichever occurs first) This covers converters and the PCM. SOME F-bodys had a special policy on the converters for 10 years or 120k miles. The only way to tell is to have the dealer diagnose the problem and figure out if it is even the converters themselves.

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    Junior Member ricefordiner's Avatar
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    the dealer was goin to charge me 110 buks if it wasnt the cats that were bad just to chek them even though its a recall? i explained to the guy the codes it was throwing and i have a scanner in handy so i cheked it myself! that guy at the dealershit pissed me the fuk off!

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    Junior Member ricefordiner's Avatar
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    he was like "just cause you throw those codes doesnt mean the cats are bad" was the dealer shits that strict on u guys when u got them changed?

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    Junior Member ricefordiner's Avatar
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    i have the oxygen sensors, should i just instal them and then see if the codes disapear, then take it bak to the dealershit? ur help would be most appreciated thanks guys!

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    Quote Originally Posted by ricefordiner View Post
    i have the oxygen sensors, should i just instal them and then see if the codes disapear, then take it bak to the dealershit? ur help would be most appreciated thanks guys!
    Put the 02 sensors in and reset the pcm and drive it. If the SES light comes on again, get the codes rescanned and then bring it back to the stealership...

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