1995 Mercury Sable 3.0L Diagnostic Code P0121: TP Sensor Voltage Too High - No Check Engine Light, Engine Runs Smoothly

Model: 1995 Mercury Sable Fault Code: P0116 Posted: 2016-07-17 14:20

My 1995 Mercury Sable 3.0L is showing diagnostic code P0121, indicating a 'TPS voltage too high' fault. Despite this, the check engine light does not illuminate and the engine runs smoothly under all conditions. I have tested the throttle position sensor (TPS) electrically and confirmed it meets all standard test parameters. Voltage readings are consistent and smooth across the full range of throttle opening and closing. The issue persists even with no visible symptoms or performance problems. Why is this code being triggered if the TPS appears to be functioning correctly?