Diagnostic Aids

Check sensor heater operation.

Fig 1: Code P0133 Schematic ("S" & "T" Series 4.3L (VIN W) Bank 1, Sensor 1) Heated Oxygen Sensor Slow Response

Fig 2: Code P0133 Flow Chart ("S" & "T" Series 4.3L (VIN W) Bank 1, Sensor 1) Heated Oxygen Sensor Slow Response