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Code P0171

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Old 12 Jun 2009, 05:41 pm
leftoverture's Avatar
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Join Date: Aug 2008
Location: Lester Prairie, MN
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Default Code P0171

Got a code P0171 on the cruiser (year 2001). I know there are lots of things it can be. Just wondering if any of you have had it and what it was in your case?
2001 PT Cruiser Limited Edition
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Old 12 Jun 2009, 06:17 pm
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Join Date: Sep 2001
Posts: 27,743
Default Re: Code P0171

From PT

P0171 - 1/1 Fuel System Lean - A lean air/fuel mixture has been indicated by an abnormally rich correction factor.

There are a number of possible causes including:

Restricted Fuel Supply Line
Fuel Pump Inlet Strainer Plugged
Fuel Pump Module
O2 Sensor
O2 Signal Circuit
O2 Return Circuit
O2 Sensor Heater Operation
Throttle Position Sensor Sweep
MAP Sensor Operation
ECT Sensor Operation
Engine Mechanical Problem
Fuel Contamination/Exhaust Leak

The majority of tests performed to rule out each component require the use of a DRB III scan tool and or special equipment which most owners do not have, therefore your ability to DIY will be limited. However the diagnostic that I provided will give you some idea on which areas to focus on.

As far as others on the forum having that same code:

P0171 Error code

Oxygen Sensor
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