OBD Guide
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P0121

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

P0121 is an OBD-II diagnostic trouble code meaning: Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance. Common causes: throttle position sensor malfunction, damaged tps sensor wiring or connectors. Estimated repair cost: $11–89.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$11–89 (est.)

Symptoms

  • Unstable idle speed
  • Jerks during acceleration
  • Loss of engine power
  • Increased fuel consumption
  • Difficulty starting the engine
  • Unexpected increase in speed
  • Check Engine Light Illuminated

Causes

  • Throttle Position Sensor Malfunction
  • Damaged TPS sensor wiring or connectors
  • Dirty or stuck throttle valve
  • Incorrect sensor calibration
  • Mechanical wear of the throttle assembly
  • Connector pin corrosion
  • Engine control unit malfunction

How to Fix

  1. Connect a diagnostic scanner and read all error codes
  2. Check the operation of the TPS sensor using a multimeter
  3. Inspect wiring and connectors for damage
  4. Clean the throttle valve from carbon deposits and dirt
  5. Check the correct installation and fastening of the sensor
  6. If necessary, replace the throttle position sensor
  7. Calibrate the new sensor according to the manufacturer's procedure
  8. Clear error codes and test drive

Related codes

P0120P0122P0123P0220P0222P0223

Error P0121 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0121 code mean?

P0121 is an OBD-II diagnostic trouble code that indicates: Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance

What causes a P0121 error code?

The most common causes of P0121 include: Throttle Position Sensor Malfunction; Damaged TPS sensor wiring or connectors; Dirty or stuck throttle valve; Incorrect sensor calibration.

How do I fix a P0121 diagnostic trouble code?

To fix P0121: Connect a diagnostic scanner and read all error codes. Check the operation of the TPS sensor using a multimeter. Inspect wiring and connectors for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0121?

Limited driving only, diagnose soon

How much does it cost to fix P0121?

The estimated repair cost for P0121 is $11–89. Actual cost depends on your vehicle, location, and labor rates.

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