P4030 Code will not go away
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Freshman User
Joined: Mar 2003
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P4030 Code will not go away
(Correction P0430)
Received the code which stated I had a bad O2 sensor downstream threshold bank 2. I decided to replace the all O2 Sensor and change the plugs but after clearing the code it comes back after a few miles. I have reset the code using an OBD II and taking the NEG BAT cable off for 6 hours. I installed a new complete Magnaflow stainless system in late August 2008 from the exhaust maniford to tailpipe.
Navigator pictures by dtl504 - Photobucket
I am lost! could the catalyst convertor be bad? I do not have any leaks in the exhaust system....Puzzle......
Received the code which stated I had a bad O2 sensor downstream threshold bank 2. I decided to replace the all O2 Sensor and change the plugs but after clearing the code it comes back after a few miles. I have reset the code using an OBD II and taking the NEG BAT cable off for 6 hours. I installed a new complete Magnaflow stainless system in late August 2008 from the exhaust maniford to tailpipe.
Navigator pictures by dtl504 - Photobucket
I am lost! could the catalyst convertor be bad? I do not have any leaks in the exhaust system....Puzzle......
Fleet Owner
Joined: Apr 2008
Posts: 24,316
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From: 0,0,1
Although I agree with your diagnosis, I am equally wondering why a 1-1/2 year old catalytic converter would be bad already?
Hotshot
Joined: Jan 2004
Posts: 19,760
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From: St Louis
I learned a really loooonnnnng time ago (the hard way) - just because something is new(er), doesn't mean it's good. Always assume it can be anything and follow the data.
Assuming it's not a manufacturing defect, the most common reason for premature cat failure is due to excessive unburned fuel getting dumped into it for an extended time. A misfire, vacuum leak, or a faulty O2 sensor (either of which should have previously tripped a MIL) are the more common reasons.
Senior User
Joined: Feb 2005
Posts: 285
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From: Ft. Worth, TX
It's a MagnaFlow...
I learned a really loooonnnnng time ago (the hard way) - just because something is new(er), doesn't mean it's good. Always assume it can be anything and follow the data.
Assuming it's not a manufacturing defect, the most common reason for premature cat failure is due to excessive unburned fuel getting dumped into it for an extended time. A misfire, vacuum leak, or a faulty O2 sensor (either of which should have previously tripped a MIL) are the more common reasons.
I learned a really loooonnnnng time ago (the hard way) - just because something is new(er), doesn't mean it's good. Always assume it can be anything and follow the data.
Assuming it's not a manufacturing defect, the most common reason for premature cat failure is due to excessive unburned fuel getting dumped into it for an extended time. A misfire, vacuum leak, or a faulty O2 sensor (either of which should have previously tripped a MIL) are the more common reasons.
FTE Legend
Joined: Mar 2009
Posts: 161,103
Likes: 8,083
From: North Bay Ont Canada
I had some welding done on my exhaust system & soon after the code came on for all 4 sensors,after fooling around for days I found a blown fuse in the fuse box under the hood,that was the problem,Gigger
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