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2000 GMC SAVANA
4.3L V6•RWD•gas•L35
2 active safety recalls on this vehicle — view recalls
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Repairs0Labor505Torque139Fluid8DTC1763Battery1Maintenance0Recalls2
P1137moderate severityPowertrain

HO2S Lean System Bank 1 Sensor 2

on 2000 GMC Savana 4.3L V6 · RWD

What this code means

The bank 1 downstream oxygen sensor indicates a lean condition. This can affect catalyst monitoring and fuel control.

Symptoms

  • Check engine light on
  • Poor fuel economy
  • Possible catalyst code

Common causes

  • Exhaust leak near sensor
  • Faulty downstream O2 sensor
  • Wiring or connector fault
  • Lean fuel condition

Diagnostic steps

  1. Scan and view downstream O2 data
  2. Inspect exhaust for leaks
  3. Check sensor wiring and connector
  4. Replace O2 sensor if faulty
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