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2001 GMC SAVANA
4.3L V6•RWD•gas•L35
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Repairs0Labor505Torque139Fluid8DTC1765Battery1Maintenance0Recalls0
P1157moderate severityPowertrain

HO2S Lean System Bank 2 Sensor 2

on 2001 GMC Savana 4.3L V6 · RWD

What this code means

The downstream oxygen sensor on bank 2 indicates a lean exhaust condition. This is a GM-specific code with no direct generic OBD-II equivalent.

Symptoms

  • Check engine light on
  • Reduced fuel economy
  • Hesitation under load

Common causes

  • Exhaust leak near sensor
  • Vacuum or intake leak
  • Faulty downstream O2 sensor
  • Weak fuel delivery

Diagnostic steps

  1. Scan and record freeze frame data
  2. Inspect exhaust for leaks
  3. Check fuel pressure and trims
  4. Test or replace O2 sensor
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Other Powertrain codes on this vehicle

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