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Smog Check Repair

2002 Nissan Maxima High RPM Problem

My 2002 Nissan Maxima failed the smog test because the check engine light was on and there was a trouble code P0507. The smog technician said it has something to do with my car's idle speed and RPM. Without pressing the gas pedal the idle is high. The car does feel like it idles a little high, but I've never really had a problem with it. Could this be something with a fuse? Also, if my Maxima doesn't pass the smog test I could apply for low income so that they could help me pay up to $500.00 in repairs. Is that true of course meeting all the criteria low income?


The engine control computer (ECC) generates trouble code P0507 when it senses something is wrong with the engine idle (RPM) speed. On a computer controlled throttle vehicle, such as your Nissan Maxima, there is no accelerator cable which opens or closes the throttle plate; which is used to increase or decrease engine RPM. Whenever the ECC senses the engine idle speed is different than what it has calculated to be, trouble code P0507 is triggered and the check engine light is turned on.

The likely faults for high RPM trouble code may be due to one or more of the following:

  • Major or minor vacuum leak between or within engine components
  • Defective intake manifold or throttle body gasket; causing a vacuum leak
  • Defective or damaged EGR valve; causing a vacuum leak
  • Defective PCV (positive crankcase ventilation) valve
  • Failed IAC (idle air controller) or faulty IAC circuit

In order to pass the smog check it will be necessary to have a smog check repair station conduct an accurate diagnosis of your Nissan Maxima's smog check failure. Once the problems is repaired, the check engine should be reset, and the vehicle driven approximately 200-300 miles over the course of 2-3 days in order to make the "emissions monitors" ready for the smog retest.

For Smog Check Repair Assistance please follow the link below:

I Need Help Paying for Smog Check Repairs

posted by SmogTips Support 02-04-2016 07:15 AM

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