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2001 GMC SAVANA
4.3L V6•RWD•gas•L35
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Repairs0Labor505Torque139Fluid8DTC1763Battery1Maintenance0Recalls0
P1132moderate severityPowertrain

HO2S Circuit Low Variance Bank 1 Sensor 1

on 2001 GMC Savana 4.3L V6 · RWD

What this code means

The bank 1 upstream oxygen sensor shows little signal variation. This suggests the sensor is stuck or unresponsive.

Symptoms

  • Check engine light on
  • Poor fuel trim
  • Reduced fuel economy

Common causes

  • Faulty O2 sensor
  • Contaminated sensor tip
  • Wiring or connector issue
  • Exhaust leak

Diagnostic steps

  1. Scan and graph O2 sensor voltage
  2. Check for flat or stuck signal
  3. Inspect wiring and connector
  4. Replace O2 sensor if unresponsive
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