code p0174 running to lean

2007 PONTIAC G5
140,000 MILES
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WAYNE1988
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I have a 2007 Pontiac g5. My ce just came on and the code is p0174 which is the car is running to lean.i looked for leaks but nothing visible?

When I'm giving it the gas I can hear a rattling noise from my exhaust up from somewhere
Sep 23, 2012 at 12:34 AM
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ASEMASTER6371
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174 could be a vacuum leak, low fuel pressure or a bad mass air flow sensor.

Roy
Sep 23, 2012 at 12:45 AM
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WAYNE1988
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How do I check for these possible problems without have to take it to a mechanic
Sep 23, 2012 at 1:18 AM
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ASEMASTER6371
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you need a fuel pressure gauge, and a scan tool to monitor the long terms. not really a job for home. at least get a diag to confirm the failure as guesses are expensive and most of the time wrong

Roy
Sep 23, 2012 at 1:24 AM
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WAYNE1988
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Don't know if this will help but when I fill my car up with gas my ce goes off
Sep 23, 2012 at 9:34 PM
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ASEMASTER6371
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with the 174, it should not effect it.

Roy
Sep 23, 2012 at 9:47 PM
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WAYNE1988
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so turns out i have a leak at flexpipe infront of my o2 sensor. i was wondering how do i know what kind of cat my car has? or if i could put a aftermarket one on with my oem exhaust? my flexpipe and cat are one assembly. thx
Sep 25, 2012 at 2:21 AM