Question about 2003 Mazda MPV

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I have a 2003 MPV with trouble code PO327 and PO431. What do these mean? Thank you.

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P0327 Knock Sensor 1 Circuit Low Bank 1 or Single Sensor
P0431 Warm Up Catalyst Efficiency Below Threshold Bank 2


Posted on Sep 28, 2009

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I own one of these (nightmare) MPV's. After Ford got their hands on them they are complete junk (I have the repair receipts to prove it).
I fixed bank one about a year ago (PO421) and now bank two is looking to be replaced (P0431). Bank 1 cost $980 for a new catalyst converter and an O2 sensor as Ford (in their infinate engineering wisdom) designed the catalyst convertor DIRECTLY on the exhaust manifolds so they warm up faster.

Best advice is to not get sucked into buying the cat from the dealer and insist on a quality non-OEM direct fit and sell it!

Posted on Mar 19, 2010

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You may want to try adding some good fuel injector cleaner and filling it with premium gasoline.. Lee

Posted on Sep 29, 2009

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Posted on Jan 02, 2017

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Code po300 and po327 on a 2003 suburban what do these mean


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It depends on the actual problem.
Code 431 means the catalytic converter is not performing as expected. The computer uses data from the O2 sensors to monitor cat performance.
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Hi there:This code is for the fuel pressure control solenoid, the solenoid could caus all the codes so I suggest checking it firts. To test..- Remove the PRC solenoid valve.- Check for air flow between ports of the solenoid valve.- If not as specified, replace the PRC solenoid valve.
Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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Intake Air Temperature Sensor Circuit Range/Performance
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IAT sensor signal circuit has high resistance IAT sensor has drifted out of calibration IAT sensor is damaged or has failed PCM has failed

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check the pcv hose at the back of the intake manifold it often leaks and will cause several idle problems

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