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Old 05-04-2011, 07:22 PM   #1
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Default p0171 p0174 on an 04 gxp

just had my check engine light come on after a hard acceleration. got the codes checked and it turns out that bank 1 and bank 2 are running lean. anybody else see these codes? im thinking possibly fuel filter/pump because i have been running the tank fairly low recently. any suggestions?
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Old 05-04-2011, 07:36 PM   #2
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Check for vacuum leaks. They can make you run lean.

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Old 05-04-2011, 09:06 PM   #3
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Alot of possibles for the codeWhen you say it'* after hard acceleration makes me think fuel pump, filter, and injectors as well as 2KG'* advice. Not a common code for GXP'* thus far.
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Old 05-05-2011, 04:20 AM   #4
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whats the mileage on your car? when was the last time the fuel filter replaced?
i would definitely start with that, many people forget their maintenance lol
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Old 05-05-2011, 09:27 AM   #5
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I started getting the P0171 and P0174 codes several months ago on my '05 which is currently at 66,400 miles so there are at least two of us experiencing these codes on GXPs. The fuel filter was replaced at 43K. I either reset the codes with my OBDII or just let the SES indicator get reset by the required number of restarts. Then the car will go for several weeks without an error indication. I have noticed nothing unusual in the cars performance or fuel mileage so I am just living with the condition for the time being.
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Old 05-06-2011, 02:28 AM   #6
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If your going the wait and see route, I suggest pulling to positive wire for a couple seconds, and dump some Techron in the tank. Pretty good stuff and it can't hurt.
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Old 05-06-2011, 05:16 AM   #7
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Testing the pressure might also help, wouldn't it?
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Old 05-06-2011, 09:31 AM   #8
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i would say that too, the fuel pumps sometimes start to loose pressure a little until they fail. if your on the low end you may need to replace it. theres also a screen on the pickup that can catch some whatever, i think you guys have inspection covers might be worth popping the sender out and take a look. just make sure you get a good seal when putting it back together or youll start with the evap codes
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Old 05-06-2011, 10:12 PM   #9
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yeah thats what i meant, i mean start with what you can do youself before jumping into a shop and spending money on it
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Old 05-07-2011, 06:41 PM   #10
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right on guys. well i did some searching and found that my intake hose clamps were loose (probably didnt have anything to do with the codes but i tightened them anyway), but couldnt tell if there was anything leaking on the vacuum lines. poured some slick 50 in the tank and bit the $75 full tank bullet. had the codes reset and the light hasnt come back on, at least for now. the car has 111k and i havent replace the fuel filter since 60k. where do i look for the fuel filter? is it in line underneath the car or do i have to go into the tank? and while im at it, where the heck is the pcv valve? i bought one thinking that id replace it myself, and the new one looks nothing like anything that i can see under the hood. the only piece that i can find that even remotely looks like a pcv is like half the size of the one i bought, which is the one that advance autoparts' computers told me to use.
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