P1121 – Throttle Position Sensor Range/Performance (Nissan)

Description

The ECM detected a TPS signal outside the expected range.

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Symptoms

  • Poor acceleration
  • Hesitation
  • Rough idle
  • High idle
  • Check engine light

Causes

  • Faulty TPS sensor
  • Throttle body wear
  • Wiring issues
  • ECM signal error

Diagnosis

  • Test TPS output
  • Inspect wiring
  • Check throttle body
  • Scan live data

Repair

  • Replace TPS sensor
  • Repair wiring
  • Service throttle body