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1997 TOYOTA 4RUNNER
3.0L V6•4WD•AUTOMATIC•gas
4 active safety recalls on this vehicle — view recalls
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Repairs0Labor1028Torque6708Fluid18DTC1806Battery2Maintenance0Recalls4
P2201high severityPowertrain

NOx Sensor Circuit Range/Performance Bank 1

on 1997 Toyota 4Runner 3.0L V6 · 4WD

What this code means

NOx sensor on bank 1 is responding but values are outside expected range.

Symptoms

  • Check engine light
  • Poor emissions performance
  • Possible SCR fault codes

Common causes

  • Degraded NOx sensor
  • Exhaust leak near sensor
  • Contaminated sensor element

Diagnostic steps

  1. Compare actual NOx levels to expected at various loads
  2. Check for exhaust leaks
  3. Inspect sensor condition

Repair notes

Replace NOx sensor if out of specification after leak check.

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