P0057+P1456 is gone but now P0420+P0456
07-06-2011, 11:03 AM
#1
P0057+P1456 is gone but now P0420+P0456
First of all, sorry for the long story but it might help in figuring out the problem. I have had a SES light for a while and since my registration expired May 2011 I decided to get it fixed in order to pass emissions.
Well, I did a scan and came up with P0057 (Bank 2 Sensor 2) and P1456 (Very Small Leak) so I figured I would worry about the obvious one first (the O2 sensor). I went to O'reillys and told the guy that I needed the bank 2 sensor 2 but their system has it labeled left/right upstream/downstream. He told me he was positive bank 2 was the firewall side so I trusted his word, and he sold me a Bosch O2 sensor for $150 which had a really short wire so I had to cut and extend to reach.
After replacing the sensor I drove approx. 30 miles then did another scan to see if the code was gone but it was still there. So after doing some research, I found out that Bank 2 is on the radiator side and the guy at O'reillys doesn't know what he is talking about.
So I decided that since I replaced a perfectly good O2 sensor, that I would use the one I replaced from bank 1 to replace the bank 2 sensor (and splice to bank 2 sensor 2 plug). Went back to scan and now the P0057 is gone but now I have P0420.
So is this because I have a bad cat? or did cutting and splicing both downstream sensors f*** something up? I recently bought some Cattman headers/y-pipe but they are still sitting around waiting to be installed (when I have the time) and then I'll do O2 sims (If I can find anyone that sells them anymore) but will headers/O2 sims fix the P0420 code or do I need to go buy 2 new (correct length) downstream sensors as well?
On a side note, the P1456 has changed to P0456 (both say very small leak) but I will look into that after I figure out the P0420
Well, I did a scan and came up with P0057 (Bank 2 Sensor 2) and P1456 (Very Small Leak) so I figured I would worry about the obvious one first (the O2 sensor). I went to O'reillys and told the guy that I needed the bank 2 sensor 2 but their system has it labeled left/right upstream/downstream. He told me he was positive bank 2 was the firewall side so I trusted his word, and he sold me a Bosch O2 sensor for $150 which had a really short wire so I had to cut and extend to reach.
After replacing the sensor I drove approx. 30 miles then did another scan to see if the code was gone but it was still there. So after doing some research, I found out that Bank 2 is on the radiator side and the guy at O'reillys doesn't know what he is talking about.
So I decided that since I replaced a perfectly good O2 sensor, that I would use the one I replaced from bank 1 to replace the bank 2 sensor (and splice to bank 2 sensor 2 plug). Went back to scan and now the P0057 is gone but now I have P0420.
So is this because I have a bad cat? or did cutting and splicing both downstream sensors f*** something up? I recently bought some Cattman headers/y-pipe but they are still sitting around waiting to be installed (when I have the time) and then I'll do O2 sims (If I can find anyone that sells them anymore) but will headers/O2 sims fix the P0420 code or do I need to go buy 2 new (correct length) downstream sensors as well?
On a side note, the P1456 has changed to P0456 (both say very small leak) but I will look into that after I figure out the P0420
07-06-2011, 12:44 PM
#3
Sexier Than Simpson
Join Date: Apr 2007
Location: Buffalo/Alden, NY
Posts: 1,683
First off, an O2 code is most likely the result of something else and not its own fault. Downstream O2's dont change how your car runs and since you need O2 sims I would have just bought those anyway. More than likely the leak triggered the O2 code since the sensor reads an expected range and any leak of air will throw an out of voltage range code.
