p0430,0420 - Taurus Car Club of America : Ford Taurus Forum
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post #1 of 13 (permalink) Old 04-05-2011, 11:09 AM Thread Starter
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p0430,0420

2005 ford taurus vulcan
error code that i never had b4
p0430,0420
you guys came thru b4 need you all again ty
in advance
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post #2 of 13 (permalink) Old 04-05-2011, 11:14 AM
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Both of your downstream O2 sensors are reading too much fuel in the exhaust gas. Your long-term fuel trims are probably set rich from running with a vacuum leak. Try disconnecting the battery for 10 minutes, reconnect it, take the car out and drive it like you stole it for about 30 miles. PCM will relearn fuel trims.

edit: it could also mean that both of your O2 sensors and/or cats have gone bad simultaneously, but I kind of doubt that. Your recent work points to a rich fuel/air mix. Try the battery trick first.


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Last edited by danhasenauer; 04-05-2011 at 11:20 AM.
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post #3 of 13 (permalink) Old 04-05-2011, 05:33 PM Thread Starter
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Quote:
Originally Posted by danhasenauer View Post
both of your downstream o2 sensors are reading too much fuel in the exhaust gas. Your long-term fuel trims are probably set rich from running with a vacuum leak. Try disconnecting the battery for 10 minutes, reconnect it, take the car out and drive it like you stole it for about 30 miles. Pcm will relearn fuel trims.

Edit: It could also mean that both of your o2 sensors and/or cats have gone bad simultaneously, but i kind of doubt that. Your recent work points to a rich fuel/air mix. Try the battery trick first.
ty ill try it
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post #4 of 13 (permalink) Old 04-05-2011, 08:38 PM Thread Starter
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I disconnected neg battery cable
drove to manhattan from long island
and to jones beach on the way back
still no check engine light

forgot to mention early today
that the light didnt come on until after
after the scan
no probs until scan
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post #5 of 13 (permalink) Old 04-06-2011, 06:33 AM
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If your fuel economy is OK and the car will pass inspection, I personally would let it go until the cats go out completely. Unfortunately that code does mean the catalysts are below their efficiency threshold.

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post #6 of 13 (permalink) Old 04-06-2011, 06:53 AM Thread Starter
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If your fuel economy is OK and the car will pass inspection, I personally would let it go until the cats go out completely. Unfortunately that code does mean the catalysts are below their efficiency threshold.
thats what im trying to do pass inspection
like i said drove from long island to to manhattan and back
drove to jones beach all together 75 miles
of driving no check engine light
so im going to drive to the beach about 25 miles there 25 back
then to inspection shop if no check engine light
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post #7 of 13 (permalink) Old 04-06-2011, 10:42 AM
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After repairing the vac. leak, prob. relearning fuel trims as Dan mentioned.
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post #8 of 13 (permalink) Old 04-06-2011, 07:44 PM
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p430 and p420 may be pending, that is no Check Engine light. Do they check pending codes?

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post #9 of 13 (permalink) Old 04-07-2011, 07:23 AM Thread Starter
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p430 and p420 may be pending, that is no Check Engine light. Do they check pending codes?
im not sure
all i know is
the repair put it on the scanner and it said 2 cat sensors wasnt ready
i was told drive 50 miles
i did that and returned to the repair shop as i pulled in the check eng light was on
scanner came up with 420,430
repair shop and the family here said reset and drive again i did
no check engine came back on but scanner still came up w/ 420 430
put sea foam in tank still ran 420,430
put sea foam in fuel line no more codes was it the seafoam? or was it i finally drove it enough? idk
i appreciate you guys and this forum
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post #10 of 13 (permalink) Old 04-07-2011, 07:24 AM
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^^^^^^ Good point. Cat efficiency codes usually take a fairly long time to set. The other problem the OP may have is that some of the other IM monitors, such as EVAP, take forever to set due to the specific conditions that need to be present for the EVAP test to run. Different states have different requirements as to how many IM monitors can be pending for the car to pass inspection.

A good idea would be to use a scan tool to 1) see if 420 / 430 are pending, and 2) see how many of the IM monitors are complete. A call to your DMV might be in order to ask how many IM monitors can be pending and still pass the test.

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