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1997 TOYOTA 4RUNNER
3.4L V6•RWD•AUTOMATIC•gas
4 active safety recalls on this vehicle — view recalls
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Repairs0Labor509Torque3204Fluid8DTC1656Battery1Maintenance0Recalls4
P0549moderate severityPowertrain

Exhaust Gas Temperature Sensor Circuit High (Bank 2 Sensor 1)

on 1997 Toyota 4Runner 3.4L V6 · RWD

What this code means

The PCM detected a high voltage signal from the bank 2 exhaust gas temperature sensor. This sensor monitors exhaust heat to protect turbo and aftertreatment parts.

Symptoms

  • Check engine light on
  • Reduced engine power
  • Possible limp mode

Common causes

  • Faulty exhaust gas temperature sensor
  • Open in sensor wiring
  • Corroded or loose connector
  • Failed PCM input circuit

Diagnostic steps

  1. Read bank 2 sensor data with scan tool
  2. Inspect wiring for opens
  3. Measure sensor resistance and signal
  4. Compare with known good temperature reading
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