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2000 Ford F250 5.4L V8 with engine code P1120. TPS tested with meter and passes on all 3 leads but OBDII TPS reading is < 5% at full throttle. Any ideas?

Vehicle: 2000 Ford F250 5.4L V8

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Hi there,

This indicates a wiring issue between the TPS and the computer. Unless you are checking the wiring right at the computer pins, then the computer is the likely culprit. I would following the wiring harness and see if it's broken or rubbing against the engine block someplace causing the problem.
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P1120 FORD - Throttle Position Sensor Out of Range
Read more: https://www.autocodes.com/p1120_ford.html

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