P2163: Throttle/Pedal Position Sensor A Maximum Stop Performance

P2163 concerns position signal A at the upper end of its travel: with the throttle or pedal resting on its maximum mechanical stop, the reading or the learned full-open value lies outside the band the calibration accepts. On Ford layouts A is the first throttle body sensor, while D to F belong to the pedal. Ford lists P2163 for the 2014 Boss 302S with MIL and wrench lamp. A Visteon patent shows the idea: the motor presses the plate onto its fully open stop for about 60 ms, the sensor value is stored, and a learned stop outside roughly 80 to 110 degrees is reported as a failure. Carbon, a bent stop or a worn sensor track are typical causes. P2109 is the matching closed-stop check; P2164-P2168 test the other letters. Reduced power is possible.

Symptoms

• Check engine and throttle warning lamps on
• Engine does not reach full power
• Limp mode with limited throttle opening

Most likely causes

• Carbon or a bent stop keeps the plate from reaching full opening
• Sensor A track worn at the full-open end
• Replacement throttle body not matching or not relearned
• Contact resistance in the sensor connector shifting the signal

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the pedal and throttle connectors
2. Compare the reading with other engine data while varying the engine speed.
3. Use live data to confirm that both sensors rise smoothly and consistently
4. Clean the throttle if it has carbon buildup
5. Run the relearn procedure with the scanner if the manufacturer requires it
6. Replace the part identified by the diagnosis

Good to know

• Repair difficulty: medium
• It can trigger limp mode.
• It affects emissions.

What each character of P2163 means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 1: Air and fuel
• 63: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2163?

Be careful: the car may suddenly lose power. If it goes into limp mode, get off the highway and calmly make your way to a repair shop.

What causes code P2163?

The most common causes are: carbon or a bent stop keeps the plate from reaching full opening; sensor A track worn at the full-open end; replacement throttle body not matching or not relearned.

Related codes

• P2109Throttle/Pedal Position Sensor A Minimum Stop Performance
• P2164Throttle/Pedal Position Sensor B Maximum Stop Performance
• P0121Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance
• P2135Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation
• P2119Throttle Actuator A Control Throttle Body Range/Performance

Sources

• performanceparts.ford.com: 2014 BOSS 302S OBDII Codes
• patents.google.com: en
• newtonnet.co.uk: fordobd2012
• law.cornell.edu: 13 CCR 1968.2

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.