P0401 code on 1997 Isuzu rodeo

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jgholley@gmail.com - 05 Jun 2006 14:49 GMT

I am getting a P0401 code on a 1997 Isuzu Rodeo V6 engine with
approximately 140,000 miles. EGR valve has been replace a few years
ago. The check engine light comes on and sets the P0401 code when the
fuel tank is 1/4 tank full or less. When you fill the tank with gas the
check engine light goes out after you drive the vehicle for a while and
cycle the engine on and off. The check engine light will come on when
the tank again drops below 1/4 full. Any ideas as to the problem.

John Holley

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Ed - 05 Jun 2006 16:25 GMT

I have a similar problem on my '98 Amigo 2.2L 4 cyl. I just bought an
ODB-II reader and I haven't run it low enough to get a code and I had
disconnect the battery for another repair. Do you have any other codes
present?

>I am getting a P0401 code on a 1997 Isuzu Rodeo V6 engine with
> approximately 140,000 miles. EGR valve has been replace a few years
[quoted text clipped - 5 lines]
>
> John Holley

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Ed - 05 Jun 2006 16:33 GMT

Forgot to mention, that when the tank gets to about 1/8 the gas guage goes
nuts. It will jump to 1/2 indicated, then slowly drop to near empty.

>I have a similar problem on my '98 Amigo 2.2L 4 cyl. I just bought an
>ODB-II reader and I haven't run it low enough to get a code and I had
[quoted text clipped - 10 lines]
>>
>> John Holley

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jgholley@gmail.com - 05 Jun 2006 18:35 GMT

> I have a similar problem on my '98 Amigo 2.2L 4 cyl. I just bought an
> ODB-II reader and I haven't run it low enough to get a code and I had
[quoted text clipped - 10 lines]
> >
> > John Holley

No, that is the only code that is set and the gas gauge does not jump
but is steady. I have seen some online diagnostic services state the
401 code is based on the interaction between the MAP sensor and the
EGR valve. Since the EGR has been changed once already and I am on the
original MAP sensor maybe I need a new MAP sensor. I can pick one up
for about $50 online so maybe that is the way to go. The EGR is
anywhere from $90 to $150 online. I don't like the idea of just
swapping parts hence the posting to see if anyone can help troubleshoot
or advise of similar condition and their solution.

John Holley

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Kaz - 07 Jun 2006 05:58 GMT

Try cleaning your EGR pipe. I am about to do the same to attempt to
kill my codes.

http://www.automotiveforums.com/vbulletin/showthread.php?p=1777258#post1777258

>> I have a similar problem on my '98 Amigo 2.2L 4 cyl. I just bought an
>> ODB-II reader and I haven't run it low enough to get a code and I had
[quoted text clipped - 22 lines]
>
> John Holley

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David Naylor - 18 Aug 2006 00:26 GMT

> Try cleaning your EGR pipe. I am about to do the same to attempt to
> kill my codes.
[quoted text clipped - 27 lines]
>>
>> John Holley

Guys make sure your gas caps o ring is in good shape that bring up the
same code for some stupid reason

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