P1445 — Volkswagen — Catalyst Temperature Sensor 2 Circuit Range Performance

P1445 (Volkswagen): Catalyst Temperature Sensor 2 Circuit Range Performance — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Catalyst Temperature Sensor 2 Circuit Range Performance. Source catalogue definition; confirm applicability using vehicle service information.

Affected system: Powertrain

Symptoms

  • Check engine light illumination
  • Inaccurate catalyst temperature readings
  • Potential decrease in fuel efficiency
  • Possible engine performance degradation
  • Failure of vehicle emissions test

Possible causes

  • Faulty catalyst temperature sensor
  • Damaged or melted sensor wiring
  • Corroded or loose electrical connector
  • Internal exhaust system restriction affecting heat
  • Faulty engine control module (ECU) reading circuit

What to check

  • Inspect the sensor connector for corrosion or loose pins
  • Measure the sensor resistance using a digital multimeter
  • Check the wiring harness for signs of physical damage or heat exposure
  • Verify the live sensor data using a professional OBD-II diagnostic tool
  • Examine the exhaust system for obstructions or leaks near the sensor