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2002 LEXUS GS 430
4.3L V8•RWD•AUTOMATIC•gas
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Repairs0Labor478Torque3074Fluid8DTC967Battery1Maintenance0Recalls0
P1133moderate severityPowertrain

Air/Fuel Sensor Circuit Response Bank 1 Sensor 1

on 2002 Lexus GS 430 4.3L V8 · RWD

What this code means

The A/F sensor Bank 1 Sensor 1 is responding too slowly to exhaust changes.

Symptoms

  • CEL
  • Poor fuel economy
  • Rough idle
  • Increased emissions

Common causes

  • Aging sensor
  • Contaminated sensor
  • Exhaust leak
  • Fuel issues

Diagnostic steps

  1. Monitor sensor response time
  2. Check exhaust for leaks
  3. Test sensor heater
  4. Compare to specs

Repair notes

Replace A/F ratio sensor.

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