The throttle position sensor (TPS) tells your engine's computer exactly how far the throttle is open at any given moment — critical information for fuel delivery, ignition timing, and even automatic transmission shift points. On vehicles like the F-150, Explorer, Expedition, Mustang, and several Lincoln and Mercury models, a failing TPS can produce symptoms that are easy to misdiagnose as something more serious.
1. Rough or Erratic Idle
A degrading TPS can send inconsistent signals to the ECM even when the throttle isn't moving, causing the idle to surge, hunt, or feel unstable.
2. Hesitation on Acceleration
If the sensor's signal doesn't accurately reflect throttle position, the engine can hesitate or stumble when you press the gas pedal.
3. Sudden, Unexpected RPM Increases
A faulty TPS can occasionally cause the engine to briefly rev on its own, which understandably alarms drivers — this is one of the more distinctive TPS failure symptoms.
4. Check Engine Light with TPS-Related Codes
Codes like P0120 through P0124 point directly to throttle position sensor circuit or performance issues.
5. Poor or Delayed Transmission Shifting
Because the ECM uses throttle position data to help determine shift timing, a failing TPS can cause automatic transmissions to shift late, early, or harshly.
Why Genuine Motorcraft Matters
The DY-1164 is built to Ford's exact calibration specification for accurate, consistent signal output. Off-spec aftermarket sensors can drift out of calibration faster or produce signal noise that the ECM interprets incorrectly — leading to symptoms that return even after a "fix."
👉 Shop the Genuine Motorcraft DY-1164 Throttle Position Sensor — free worldwide shipping, and a free step-by-step install video included with every order.