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help with an engine code?
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=1&t=3633		 Page 1 of 1
Author:  harsh20 [ Tue Nov 22, 2005 8:07 pm ]
Post subject:  help with an engine code?
my check engine light came on so did the onoffonoffonoffon method and it gave me a code of P0121. can anyone tell me what this code is?
Thanks in advance.
Author:  USAFCOP [ Tue Nov 22, 2005 8:19 pm ]
Post subject: 
well, p0121 could be one of two things,

TPS Voltage does not agree with Map-TPS signal does not correlate to MAP sensor signal

or

Accelerator position sensor signal voltage is too low-APPS voltage input below minimum acceptable voltage

TPS-Throttle position sensor
MAP-Manifold Absolute Pressure
APPS-Accelerator Position Sensor

Basically, you have something electrical or a bad sensor reading

This info is from the 'o2 Liberty Service manual
Author:  harsh20 [ Tue Nov 22, 2005 8:40 pm ]
Post subject:  engine code
Thanks the info, what you said makes sence. the light comes on after i pass another vehicle or anytime i push the throttle deep. it normally clears after about 40 miles and a restart. tonight however the engine would die when i had to come to a complete stop and low and behold i ran into accident traffic on the way home with a 6 mile backup that was quite frustrating. after it was cutting off i realized throttle postion sensor could be going bad because i have had one go out on another vehicle before.
Good news is it that it is under warranty and the dealer can diagnose the root cause.
Thanks again
Author:  USAFCOP [ Tue Nov 22, 2005 11:28 pm ]
Post subject: 
well, TPS and MAP sensors are easy fixes, looks easy on the lib, probably spendy though...

I remember on my old GNX, the TPS went out all the time... due to certain mods :roll: about $25 each, Dealer price
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