DTClookup.com

Search DTC

P1121 – Lexus DTC

Lexus DTC P1121 – Accelerator Pedal Position Sensor Range/Performance Problem

DTC P1121 meaning on Lexus

DTC P1121 on a Lexus indicates a Range/Performance problem with the Accelerator Pedal Position Sensor Circuit.

Lexus DTC P1121 symptoms

  • Check Engine Light illuminated
  • Reduced engine power
  • Poor acceleration response
  • Difficulty maintaining speed

Lexus DTC P1121 causes

  • Defective accelerator pedal position sensor
  • Wiring or connector issues in the sensor circuit
  • Electronic control module (ECM) malfunction

Lexus DTC P1121 seriousness

The DTC P1121 code should be addressed promptly as it can lead to drivability issues and potential safety concerns if the accelerator pedal position sensor is not functioning correctly.

How to diagnose DTC P1121 on Lexus

  1. Use a diagnostic scanner to retrieve the trouble codes
  2. Inspect the accelerator pedal position sensor and its wiring for any visible damage
  3. Test the sensor’s voltage and resistance values according to manufacturer specifications
  4. Check for any loose connections or corrosion in the sensor circuit

How to fix DTC P1121 on Lexus

  1. Replace the accelerator pedal position sensor if faulty
  2. Repair or replace any damaged wiring or connectors in the sensor circuit
  3. If the ECM is determined to be the issue, it may need to be reprogrammed or replaced

How to erase DTC P1121 on Lexus

  1. Use a diagnostic scanner to clear the trouble codes
  2. After making necessary repairs, ensure the issue is resolved before clearing the code
  3. Perform a test drive to confirm the repair and ensure the code does not return

Recommended tools for Lexus diagnostics

Explore our expert picks: The Best OBD2 Scanners for 2025

Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter

← All Lexus Diagnostic Trouble Codes

Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.