Question about Chrysler PT Cruiser

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This is a contnuation of my Heard A Pop question. The codes are @0300, p0032, and p0038. The car is a 2004 pt cruiser, 2.4l turbo

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P0300 is
Basically this means that the the car's computer has detected that not all of the engine's cylinders are firing properly.
A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.
A code P0300 may mean that one or more of the following has happened:

  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer
Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converterThis is a contnuation of - mag-glass_10x10.gif has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

P0032 and P0038 are both of your Oxygen sensors that have gone bad and need replacing, make sure that you go OEM on these parts. Parts houses usually have something different and they sometimes work and sometimes dont.

Posted on May 20, 2011

  • 7 more comments 
  • ajuju May 20, 2011

    Very helpful. I did not concentrate
    on p0032 and p0038 because I
    thought they might have been
    brought about by the misfire, ie

  • ajuju May 26, 2011

    I am still battling with p0300, p0032, and p 0038 on my 2004 pt cruiser turbo. I have changed spark plugs, wires, coil, and oxygen sensors; but, these codes keep recurring. Please, help.

  • Jeremy Reddick
    Jeremy Reddick May 26, 2011

    Sorry to say this but the next steps would be reading your gas pressure at the fuel rails, then from there you should have your heads inspected. What happened when you heard a pop noise? Any lose of power? The engine making a loud pinging noise? How does the engine sound now? How does it drive?

  • ajuju May 26, 2011

    Thank you jgwhomeequip. It was a light pop. The engine did not loose power. However, it stumbled, and the engine light came flashing. The light stabilized and remained on. The engine does not ping, and seems to run fine, until the light comes flashing again.

  • Jeremy Reddick
    Jeremy Reddick May 26, 2011

    Have you changed your EGR Valve, and your backpressure valve?

  • ajuju May 26, 2011

    No, I have not checked the egr valve, and I am not familiar with the backpreasure valve.

  • Jeremy Reddick
    Jeremy Reddick May 27, 2011

    OK, check the EGR valve, and the back pressure valve is the hose that connects the top of the EGR valve and runs to another valve. Just trace the hose, its bolted on the firewall.

  • ajuju May 27, 2011

    Thank you . I will check those two today.

  • Jeremy Reddick
    Jeremy Reddick May 27, 2011

    No problem let me know what you find, I am hoping that gets it, without being there is hard to figure it out, so I am going from the Easiest/Cheapest to repair and up


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code p0032refers to heated oxygen sensor(HO2S) 1 bank 1-heater control--circuit high===causes --wiring short to positive--HO2S sensor--ECM
code p0038 refers to heated oxygen sensor(HO2S) 2 bank1 heater control --circuit high===causes --wiring shorted to positive --HO2S---ECM
It is most important that when installing /removing the sensor that the correct tool is used to prevent damage to the wiring for the sensors. Severely twisting the wires during installation/ removal will result in the causes for failure listed.

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upstream and downstream oxygen sensor heater voltages are too high, possible causes are
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clear codes and determine if codes are hard(current)
if they are, unplug sensors, clear codes and re-scan to see if p0032 and p0038 appear.(there will be 2 to 4 other codes generated)if p0032 and p0038 are gone from the list, change both o2 sensors.
if p0032 and p0038 are still in the list, it is either wiring or pcm issue, use a meter to check for short from o2 connector to ground, with pcm unplugged..
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Next, make sure you have replaced the correct Bank or lower or upper sensor when there can be 4 sensors on the exhaust.

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