Generation III Internal Engine 1997-2006 LS1 | LS6
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PO121 ???

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Old 11-15-2001, 01:30 PM
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Default PO121 ???

I changed my TP sensor, no change. This is a little strange because it happened ONLY after my stock transmission and convertor was put back in the car. Could the stock stall over my TP4400 have something to do with it electricly? If anyone has any ideas, please feel free to share.
Old 11-15-2001, 05:50 PM
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Default Re: PO121 ???

Hi there,
This code is for inactivity, not a low or high voltage. I would inspect for your correct 5volt reference into the TPS.
Also, see if any wires were pinched during the transmission replacement.
Besttoyou, c4c5




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