P1491 – EVAP Canister Temperature Sensor Fault (Nissan)

Description

The ECM detected a malfunction in the EVAP canister temperature sensor.

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Symptoms

  • Check engine light
  • Poor emissions

Causes

  • Sensor failure
  • Wiring issue
  • Canister overheating

Diagnosis

  • Check sensor resistance
  • Inspect wiring
  • Scan EVAP data

Repair

  • Replace sensor
  • Repair wiring

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