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Home/DTC Codes/Lincoln/MKX/2014-2014 3.7L V6/P0121
P0121

Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance

2014-2014 Lincoln MKX 3.7L V6

High SeverityPowertrainGeneric (SAE)

The 2014 Lincoln MKX is equipped with a 3.7L V6 engine. Below you'll find detailed p0121 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.

Description

The TPS signal does not match expected values for the current operating conditions.

Symptoms

  • Check Engine Light
  • Erratic throttle response
  • Stalling
  • Hesitation
  • Limp mode

Common Causes

  • Worn TPS
  • Carbon buildup on throttle body
  • Sticking throttle plate
  • Loose throttle cable

Diagnostic Steps

  1. Monitor TPS signal during throttle sweep
  2. Check for flat spots or dropouts
  3. Clean throttle body
  4. Inspect throttle cable/linkage

Repair Notes

Clean throttle body. Replace TPS if signal is erratic.

Related Codes

P0120Throttle/Pedal Position Sensor/Switch A CircuitP0122Throttle/Pedal Position Sensor/Switch A Circuit Low InputP0123Throttle/Pedal Position Sensor/Switch A Circuit High Input

Other Powertrain Codes

P0121 on Other Vehicles

Lincoln Aviator

2003-2003 4.6L V8 DOHC

Lincoln Aviator

2004-2004 4.6L V8 DOHC

Lincoln Aviator

2005-2005 4.6L V8 DOHC

Lincoln Aviator

2020-2020 3.0L Twin-Turbo V6

Lincoln Aviator

2020-2020 3.0L V6 Twin Turbo

Lincoln Aviator

2020-2020 3.0L V6 Twin Turbo Hybrid

Lincoln Aviator

2021-2021 3.0L Twin-Turbo V6

Lincoln Aviator

2021-2021 3.0L V6 Twin Turbo

Common Questions

What does code P0121 mean on a 2014-2014 Lincoln MKX?

P0121 stands for "Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance". The TPS signal does not match expected values for the current operating conditions.

What are the symptoms of P0121 on a Lincoln MKX?

Common symptoms of P0121 include: Check Engine Light, Erratic throttle response, Stalling, Hesitation, Limp mode.

What causes P0121 on a 2014-2014 Lincoln MKX?

Common causes of P0121 include: Worn TPS, Carbon buildup on throttle body, Sticking throttle plate, Loose throttle cable.

Last updated: March 2026

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