Have a P0420 Code after Header Install ?
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Have a P0420 Code after Header Install ?
I have a code coming up as P0420 ( cat efficenty system below normal bank 1 ) a month after my headers were installed & the car was tuned but I don`t know if the tuner had the O2s deleted from the system , I did have the front driver O2 replaced for running lean . Could it be the cat ? its new and came with the headers , anyone heard of any problems with SLP bullet cats ??
Thanks .
Thanks .
Last edited by 99canadahawk; 10-05-2011 at 12:05 AM.
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Thanks 2TR , So you think I need to have my rear 02`s turned off then ? it makes sense I don`t think it could be the rear o2 or a cat gone bad & I don`t recall my tuner telling me they were ever turned off so sounds like a good place to start BTW what does DTC stand for ??
Thanks !!
Thanks !!
#4
Appears your front 02's and rear 02's are communicating with each other showing a similar reading from precat sensor to aftercat sensor (gutted or no cats?) thus posting the P0420 code.
DTC = Diagnostic Trouble Code
DTC = Diagnostic Trouble Code
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Ok gotcha , could it be possilbe that it`s a bad rear O2 causing the code to pop up ? It`s just that Ive been talking to some techs at work and they keep telling me to change the O2 first and see if it fixes the problem ? ( but @ $180+ its kinda an expensive trial and error if you ask me ) and would I have to get it fully re-tuned again just to turn off the O2`s ?
Thanks again for the help I`m just not sure wich route to take ???
Thanks again for the help I`m just not sure wich route to take ???
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Ok now we`er getting somewhere ! the only reason I asked about the full tune was that I heard it from a friend of mine saying it needed to be done because of the A/F ratio would be out or something ?? but it really does not make sense like you have stated . Anyways had the car e-tesed ( with the CEL on ) & did not pass out by 3 hydrocarbons , I was also wondering if I had temp cleared the CEL for the e-test would I`ve passed. ..maybe ?? I`m going to try and get a hold of my tuner soon so we can fix this problem !!! . . .
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Not sure where or how the back 2 o2's would cause the a/f to go out?
All the back two o2's sensors do is tell the pcm,hey cats are working dont set the ses light.
The two front o2's control the a/f.
All the back two o2's sensors do is tell the pcm,hey cats are working dont set the ses light.
The two front o2's control the a/f.
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Thanks for everyones help !!! I had my tuner turn off my rear O2`s and clear the CEL everything is good to go !! But. . . . My hi flo cats are not hepling me pass emissions now so I think I will need to replace my '' new SLP cats '' that came with my headers with some Magnaflow heavy metal ones .