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P1620 – Engine Coolant Temperature Sensor Fault

Want to confirm the real cause of this fault code?

A high‑quality OBD2 scanner gives you live data, fuel trims, sensor readings and freeze‑frame information — exactly what you need to verify the root cause of this code with confidence.

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Symptoms

  • Overheating
  • Hard starting
  • Poor fuel economy

Causes

  • Faulty sensor
  • Wiring issue
  • Connector corrosion

Diagnosis

  • Read ECT data
  • Inspect wiring
  • Check connector

Repair

  • Replace sensor
  • Repair wiring
  • Clean connector
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