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06-30-2014
Hi,
I need help. I have a 2006 Pontiac Grand Prix Gxp and I'm getting a check engine light coming on code P0420 and the service engine
soon light also pops up on the DIC while I'm driving. I had the car scanned and wanted to know where bank 1 is for the O2 sensor? Thanks
for your help in advance. Already put a new cat converter in over the weekend but still getting the code.
06-30-2014
if you put in a generic weld in cat, you may not ever get rid of the P0420 code
07-02-2014
No it is a own fit car. What is the best way to remove the o2 sensor on the exhaust manifold pipe?? Really tight there against the firewall. Thanks.
07-02-2014
That code you gave is for a rear o2 sensor.
The one after the cat.
07-03-2014
And..the code isn't for a bad sensor.
Bad sensor codes include ones for sensor slow to respond, bad voltage, heater etc.
P0420 is the code that says the rear sensor isn't seeing the catalytic doing a good job of reducing the emissions .
07-03-2014
Thank you for your help. I will probably just replace both. What is the easiest way to get the upstream O2 sensor removed. I had trouble trying to get it loose from the top. Is it easier to get to it with the car jacked up from underneath. Thank you again.
07-03-2014
you need a o2 socket for the upper one. i got mine out from the top with bout a foots worth of extensions. that got my ratchet right under the cowl and the pipe on the ratchet cleared the engine.
one of these, got mine at HF for like 7 bucks.
07-03-2014
I have one of these, same basic thing.
image_13142.jpg
It's 1/2" drive..so a couple extensions and a nice long 1/2" ratchet. I've had one that fought to the point I had the car running while I fought it out.
07-03-2014
mine was just damn tight, once it broke free it came right out, the new one should come with some anti seize for the threads.
07-03-2014
Scott.. did you see which section we are in. Our method for the sensor may not be spot on.. damn 5.3's lol
07-03-2014
in another thread 91parkave i think it is, said its in the same place on a v8. exhaust is pretty much the same. same with the banks and locations. 1 and 2
07-03-2014
Thanks to everyone for your feedback. I will let u know how I make out.
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