Question about 2002 Ford Mustang

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I have a 2002 mustang gt 5 speed throwing a p01131,p01151

I have a 2002 mustang gt 5 speed throwing a p01131,and p01151,i just replaced both upstream bank 1 and 2 sensors and still throwing codes any one have a idea

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It sounds like you may have a vacuum leak, either from the intake manifold or vacuum hoses or a broken or cracked plastic vacuum line elbow, maybe around the PCV valve. Also, I would check to see if the fuel filter has been changed, if the fuel filter is dirty, it could be limiting the fuel pressure and causing a lean condition. I'd check the fuel pressure also.

Posted on May 27, 2010

  • krmr_kn May 27, 2010

    i just found a hole in a line from my pcv valve to the fuel injection could that be it

  • James Milzheimer
    James Milzheimer May 27, 2010

    That would do it. It sucks air in, and causes the motor to run lean, which the sensors pick up, and sets the codes. That's alot of the problem with computer systems in cars, the computer can't always know why the sensor is reading bad, it can be the sensor, or something else making the sensor read wrong. I'm glad you found it. I have found in 25 years of working on cars to always check the basics, then address the computer issues.



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If the orange engine management light is illuminated, then you should have a code read carried out, which will point you in the right direction as to a repair.

I will add that the most likely scenario is a faulty O2 sensor, and this can be checked via a live scan at any reputable garage. In fact, I do believe Autozone perform scans and code reads for free.

If you do have a code read done, please don't hesitate to let me know what the code or codes are and I would be more than happy to decipher it or them for you.

Very best regards


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