got code p0171 little help needed - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 17 (permalink) Old 10-25-2012, 05:21 PM Thread Starter
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got code p0171 little help needed

did some searching and most people end up with cracked vac lines or cracked pcv hose has anyone had a cracked oil seperator on the 2.3l thinking about buying it along with the pcv valve and hose



have to remove the intake to find the vac leak and decided to just replace this stuff when its off.

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post #2 of 17 (permalink) Old 10-25-2012, 06:14 PM Thread Starter
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did the carb cleaner test and seems the leak is coming from behind the intake manifold.

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post #3 of 17 (permalink) Old 11-04-2012, 11:44 PM Thread Starter
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ended up pulling the intake manifold to replace the cracked pcv hose and install new pcv hose




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post #4 of 17 (permalink) Old 11-04-2012, 11:49 PM Thread Starter
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only problem is that i am still getting p0171 code car is completely stock any ideas on things to try was also getting p0421 before hose and pcv replacement but p0421 has not showed back up yet.

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post #5 of 17 (permalink) Old 11-05-2012, 02:51 PM Thread Starter
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anybody

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post #6 of 17 (permalink) Old 11-05-2012, 10:21 PM
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Have you reset the ECU since? How many drives cycles since you replaced the PCV hose?

Sometimes, it will take the ECU a bit of time to adjust.

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post #7 of 17 (permalink) Old 11-06-2012, 09:49 PM Thread Starter
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reset the ecu yesterday to clean maf p0171 came back today.

what can cause p0171 if i have no vacuum leaks or intake?

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post #8 of 17 (permalink) Old 11-07-2012, 01:09 AM
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The workshop manual doesn't even list that code as a fault code for the L3 engine.

But for the AJ (the V6) it says it's a fuel related issue. Too lean to be precise.


Are you experiencing any symptoms? Do you have access to your own code reader? I would clear it out and see if it pops back up again.

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post #9 of 17 (permalink) Old 11-07-2012, 09:10 AM Thread Starter
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yes i have a code reader that's how i got the code i was getting both p0421 p0171 untill i fixed the pcv hose now i am only getting p0171.

cleared the p0171 twice came back both times no symptoms really besides reduced mileage and car runs smooth.

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post #10 of 17 (permalink) Old 11-07-2012, 05:28 PM Thread Starter
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well both codes are still coming up p0421,p0171 guess fixing the pcv did nothing but fix a vac leak

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