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.

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02 Renegade
Cactus Green
5 speed Manual
Evic
6 disc cd with factory Subwoofer

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

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I'm baaaaccckkk...
LOST Member 10
If you can read this you don't need glasses, go Wheel your Jeep!

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

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02 Renegade
Cactus Green
5 speed Manual
Evic
6 disc cd with factory Subwoofer

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 about $25 each, Dealer price

_________________
I'm baaaaccckkk...
LOST Member 10
If you can read this you don't need glasses, go Wheel your Jeep!