Question about 2004 Isuzu Rodeo

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3.5l Ra Rodeo running rich


keeps pulling codes po172 and po175

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  • michaelc01 Jun 22, 2008

    P0172 & P0175 codes, 02 Sensor rich does, left & right bank fuel being leaned off by up to 20%, engine revs dropping & regaining at traffic lights then engine stalls

  • DiNo001 Jan 31, 2009

    I also have code PO172 and PO175 also PO101Ive replaced the mass airflow regulator still no help. When I first start the Rodeo and put it in reverse it dies. Once I wait and start and rev it for a little while and put it directly in drive it will work. Then about 2 weeks later it starts all over again. Every mechanic I have taken it to, because the check engine light is not on at the time say we have no idea why this is happening. when I do get the chekc engine light I get the codes as stated above. Any help...Any would be fantastic.Thanks Dana deguirefam@yahoo.com


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The PCm has determined that during testing, ther fuel system for bank 2 was too rich. Can anyone know the solution?

Posted on Jan 12, 2009

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I have seen 2 things that cause this on the V6 6VE1 petrol engine, one could be a pin hole in the fuel pressure regulator diaphram causing fuel to be sucked into intake manifold. the other is a bad wire crimp joint for main earths which is in main wiring loom under injector rail on left bank between the first and second injector (black wires with black tape that has all white sticky stuff under it) take wires out of plastic tubing to find splice joint remove sticky gooie tape and clean with electrical contact spray and dry then soilder joint and re tape up. can confirm this fault by pulling moving loom when engine running and noting readings changing on scan tool for O2 sensors and possibly engine running rough then good.
should then reset fuel trim cells with scan tool after either repair then watch the short and long term fuel trims they wont be as high as they were which would have been 25% or higher to bring on check engine light and set your rich fuel trim codes.

Posted on Oct 03, 2013

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Try co2 sensor check or air filter

Posted on Jan 05, 2009

  • Baddog Oct 03, 2011

    co2 sensor? What is a co2 sensor if you will ! Did you mean o2? Just wondering if I've missed something?

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1 Answer

I have a 1997 1500 with a 5.0 Im getting codes po143 po172 po175 and po300. Im not sure what the cause could be.


Code 300 is for a random miss.
172 and 175 are for the same problem - 172 is for a rich fuel mixture bank one and 175 is for the fuel mixture too rich on bank two.
Code 143 is for a rich mixture for sensor number 3.
All of the codes could be connected to a leaking injector or other fuel problem. Very seldom are all of the O2 sensors faulty at the same time.

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When this happens, the computer tries to turn down the injectors which makes the engine run too lean.
Since you have a code for both sides, I doubt the sensors are faulty. You probably have a real problem with the fuel mixture.
You would need to check fuel pressure and look for fuel leaks into the cylinders.

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These codes mean system too rich, meaning too much fuel while running, I would check the vacuum lines and then clean the Mass Air Flow sensor (MAF), it should be located in line with the air intake tube from the air filter. Be careful not to damage the sensors internal components (use electrical cleaner or brake cleaner), and make sure it is dry before re-installation. Hope this helps, let me know.

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