P2166Throttle/Pedal Position Sensor D Maximum Stop Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2166 refers to position signal D, which on Ford designs is the first track of the accelerator pedal. The code means the reading with the pedal pressed all the way does not match the calibrated maximum, for instance because the pedal never reaches its stop or the track is worn at the far end. No manufacturer documents P2166 publicly; it applies the logic of the A version P2163 and of the open-stop learning in a Visteon patent to the pedal. A thick floor mat, a bent pedal arm or a worn pedal module are typical causes. The engine computer may then cap the torque request, so the car feels as if it never reaches full power. P2115 covers the rest position of D, P2120-P2124 its circuit, and P2138 the D/E correlation.
- What you may notice
- Engine warning lamp on
- No kickdown or no full power with the pedal floored
- Possible limp mode
- Likely causes
- LikelyFloor mat or object keeps the pedal from its stop
- PossiblePedal sensor track D worn at full travel
- RareBent pedal arm or damaged pedal bracket
- RareCorroded pedal connector shifting signal D
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.