P0420/P0430 OBD code - what a bad catalytic converter looks like
September 8th, 2013, 12:35 AM
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P0420/P0430 OBD code - what a bad catalytic converter looks like
No question, just thought I'd share a little info that might help others with codes P0420/P0430. Often I see people asking if the O2 sensors are bad or the catalytic converter. Since I use the ScanTool and software to graph the O2 sensor voltage levels, I think it's safe to see, in my case, that the bank 2 (right side) catalytic converter is toast.
Bad cat Bank 2 (right/passenger side) - notice the signals are nearly the same both pre (sensor 1) and post-cat (sensor 2), meaning, the cat isn't doing anything.
Good cat (bank 1 left/drivers side) - The pre/post cat signals are very different.
If I'm wrong, please let me know and I'll correct this post. I would hate to have a reference with bad information.
I'm using the OBD Wiz software
ScanTool.net LLC - OBDwiz Automotive Diagnostic Software
that came with my cheapo OBD interface.
OBDLink SX Scan Tool USB Interface w/ OBDwiz Diagnostic Software
on my little Gateway notebook. Well worth the $49!
Bad cat Bank 2 (right/passenger side) - notice the signals are nearly the same both pre (sensor 1) and post-cat (sensor 2), meaning, the cat isn't doing anything.
Good cat (bank 1 left/drivers side) - The pre/post cat signals are very different.
If I'm wrong, please let me know and I'll correct this post. I would hate to have a reference with bad information.
I'm using the OBD Wiz software
ScanTool.net LLC - OBDwiz Automotive Diagnostic Software
that came with my cheapo OBD interface.
OBDLink SX Scan Tool USB Interface w/ OBDwiz Diagnostic Software
on my little Gateway notebook. Well worth the $49!
Last edited by CableSux; September 8th, 2013 at 12:37 AM.
September 8th, 2013, 1:45 PM
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September 8th, 2013, 11:21 PM
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Correct, it came with the SX. Actually, I think the version that came with it was older and I downloaded the latest version at
http://www.obdsoftware.net/obdwiz.aspx
http://www.obdsoftware.net/obdwiz.aspx
Last edited by CableSux; September 8th, 2013 at 11:24 PM.
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September 18th, 2013, 9:05 AM
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FYI - Just had to replace my catalytic converter, vent valve, sub harness and O2 sensory on my 2007 Suburban with 84k miles...a $1,230 job. I missed the gov emissions warranty by 4k miles.
May 20th, 2016, 2:07 PM
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Will these codes cause the reduced engine power messages? I just had my throttle position sensor replaced and I am still getting this code....supposedly they cleaned the throttle body while replacing the sensor.