Question about 2004 Pontiac Grand Prix
Repaced map sensor in 2004 rand prix. Has no codes showing but readiness will not reset.
You have 8 I/M or Emission Monitors
5 that have to run
They should run clear after 10 or 15 miles of driving
IF,ALL problems have been resolved
The Evap Monitor will only run every few days
Any person or repair shop HAS TO Road Test with scan tool
until the monitors run,except evap,BEFORE,BEFORE,Your given
the car back
It is NOT,NOT your job to run monitors or drive cycles
You would have no idea what they are, or how to perform
them,some shops don't ,as they have no data base or care
to look up that info
Your car was not properly diagnosed or repaired (YET)
No Codes on a code reader, is not the same as using professional
tools & enhanced data & other data, to find a problem
Don't need codes present to see or find things that are not right
Posted on May 10, 2014
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Posted on Jan 02, 2017
Turn the key ahead to run mode, without cranking and push gas pedal to floor and back up 3 times within 5 sec, this should reset the oil change light. as for the tire pressure light there are a couple of procedures, but ensure first that the pressures are all above 28 psi, and are the same. however, without the use of a tpms tool to communicate with the tire monitor sensors it may not reset. did you have any tires changed over, or rotated? if so the use of the tpms tool is much easier to reset the light. Probably better off bringing to a tire or mechanical shop that deals with it regularly. It is actually not that difficult, but the tool will allow you to tell if a sensor is faulty, or has a weak battery, etc.. hope this helps
Posted on Jan 26, 2010
Change the throttle sensor first, and see if the map sensor is a victum. throttle sensor is similar to an old volume reostat, on some cars and everything else tries to do react, and everything errors out.... My bet is throttle position sensor... But you never know, it CAN be both, just usually not both.
Posted on Feb 18, 2011
Testimonial: "Thank you very much for the answer. We'll try the Throttle Position sensor first. That does make sense as to what is happening."
have someone test the T.P.S. (throttle position sensor) check to see how much a sensor is and the labor should be no more than 1/2 hour
Posted on Dec 09, 2011
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