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Old 09-28-2015, 01:42 PM   #1
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scanner code P0171

so my check engine light just came one 2 days ago and when i went to get it scanned code P0171 came up, too lean bank 1 etc.

I cleaned the MAF sensor, no luck, with the research i did i found its very common that its either a vacuum leak or an o2 sensor. I do have a cold air intake too which i hear usually kills o2 sensors. also the car has 205,xxx miles on it.
any ideas? today is my last day off for the next few days so having it taken care of soon would be ideal. any thoughts?


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Old 09-28-2015, 01:48 PM   #2
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Moved to General Tech Chat where you can find more info. on this.

PCV hose to the intake is the usual first check for a vacuum leak on these.

Cold air intake is only involved it the plumbing has a vacuum leak, no effect on O2 sensor lifespan. You need an operational sensor to get the code, guessing that it's not operating correctly is usually a bit of a stretch (not too likely).
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Old 09-28-2015, 01:51 PM   #3
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alright, im currently using a heater hose for mine, ill go pop it off and look.
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Old 09-28-2015, 03:09 PM   #4
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ok so i went out and checked on the hose and plugged one and and blew into it really hard and heard no hissing, i also checked it really closely and saw nothing, i also checked all the vacuum hoses going to the egr and they all felt alright too.
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Old 09-28-2015, 05:03 PM   #5
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Listening for hissing when running, looking at everything connected to the intake, and even using propane/ether/carb cleaner carefully on suspect joints to see if idle changes are all diagnostic tricks to try and find a possible leak. Even the brake booster hose is suspect as it carries vacuum to the booster.
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Old 09-28-2015, 05:14 PM   #6
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alright ill do that, the only hissing i heard was coming from the alternator area. i think it might just actually be the alternator hissing.
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Old 09-28-2015, 05:22 PM   #7
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Similar normal noises makes it harder.
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Old 09-28-2015, 05:30 PM   #8
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FWIW I had to replace my front O2 sensor at 150k due to it being bad.
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Old 09-28-2015, 06:22 PM   #9
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ok so i went and sprayed carb cleaner on basically everything, behind, on top, tough areas, etc. no luck, even shut the car off and started it again and tried again, nothing.

i also failed to mention when i pulled my pvc hose a little bit of water came out.
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Old 09-30-2015, 01:44 AM   #10
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could it be a fuel delivery issue? the car feels like its going to die at stop lights, when im going through the gears i can feel the flat spots in the revs and the exhaust dying. anything else im forgetting?
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