Question about 2004 Chrysler PT Cruiser

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Codes po171 and po522 on my dash board - 2004 Chrysler PT Cruiser

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P0171 Fuel system lean bank 1, P0522 Engine oil pressure/switch circuit low voltage. Take care of the P0522 get the oil pressure check out first. As for P0171 that can be from a vacuum hose leak from false air.Worn out sparkplugs. To a contaminated MAF(mass air flow sensor).Lean bank is a easy fix but low oil pressure get that look at.

Posted on Feb 25, 2012

  • Anonymous Nov 10, 2016

    Code error p0171 2007 pt cruiser turbo, How do i fix it? Thanks

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I have a Dodge Grand Caravan XL 2005. Went to get oil changed in it and the van has not ran rite since. Code is coming up Po522.


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I would start by checking the oil on the dip stick. If OK there, it sounds like you may have a bad oil pressure sensor. I would go back to the shop and have them check it.

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My 2005 PT Cruiser shows error codes P0508, P0688, and P0522. Sometimes it runs well, and other times it runs rough then dies and won't start back.


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1 Answer

PO121 code still on, replaced o2 sensors, replaced cracked air tube, put seafoam in gas. reset computer, light came back on after 40 miles. same codes. DIAGNOSTIC TROUBLE CODES PO171 System Too Lean...


PO121 : TP Sensor Performance = The PCM supplies 5V to the TP sensor(throttle position). The TP sensor is a variable resistor that drops the voltage to about 4 volts at WOT(wide open throttle) to less than 1 volt at closed throttle. Some TP sensors are adjustable. others have a learn procedure to determine closed throttle. PO171 Fuel Trim System Lean = In closed loop the PCM adjusts fuel delivery based on H2OS 1 readings and is indicated by long & short fuel trim values. If lean the PCM will add fuel (fuel trim above 0%) & if rich the PCM will reduce fuel(fuel trim below 0%) PO128 ECT Below Thermostat Regulating Temperature = possible failed thermostat, low or empty on coolant, Engine Coolant Temp Sensor, Poor connection/Harness/Wires, faulty PCM Connection. I think you hit the nail on the head , the ECT Sensor ( which is different than the temp sensor for the dash gauge)

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