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Ok is there a way to read the check engine codes without taking it to a service place, or having a computer to read them. In the past a lot of my cars have been read by simply placing a jumper wire in the plug in and it would blink the codes. Can that be done with the liberty? This is the second time my check engine light has come on since i bought the car a month ago and im starting to get pissed.
 
FiEND said:
For the 1999 Jeep Grand Cherokee and up, you do the switching the key on and off 3 times, but not quickly. You turn it to on so the odometer turns on, turn it off, and then back on, wait for the light to turn on, etc. On the fourth time you'll get a code, or you'll get the word "done."

http://www.allpar.com/fix/codes.html
Actually this works for nearly all Chrysler, Jeep, Dodge vehicles.

2005 CRD Limited Flame Red w/ Renegade rock rails & light bar, AirLift rear helper springs -225/75R16 MT/R's on cheap black steel wheels, dual MOPAR subwoofers & seat covers.
 
I was able to get a code doing the key thing. However it was erroneous. Further discussion with both the Fairbanks and Anchorage Alaska Jeep Dealers proved that this method does not work for the 2005 CRD. They both said do not use the key method. I live in a remote area. I had to have a special scanner flown in to get the real code and fix the problem. The key method showed P0096, the scanner showed P0105. The correct part was ordered and the MIL fixed.
 
learstroker said:
I was able to get a code doing the key thing. However it was erroneous. Further discussion with both the Fairbanks and Anchorage Alaska Jeep Dealers proved that this method does not work for the 2005 CRD. They both said do not use the key method. I live in a remote area. I had to have a special scanner flown in to get the real code and fix the problem. The key method showed P0096, the scanner showed P0105. The correct part was ordered and the MIL fixed.
learstroker,

By any chance, did you have a bad boost pressure sensor?
It measures both the intake manifold pressure and intake air temperature.

P0096 (Intake Air Temperature Sensor 2 Circuit Range/Performance)
P0105 (Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction)

Chris
 
I'm doing it every time I try with 4 turns of the key. The fourth time being the one I stop on in the on position to look for the code. It does not work for me when I park the car after driving. It does not work for me when I try to do it two times in a row. It seems like I have to shut off the engine, leave the car, lock the doors and then wait a awhile for something to reset. After a little while when I come back, I can do the key trick and read the codes again.
 
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