Removal Procedure

Disconnect the negative battery cable.
Locate the four oxygen sensors.

Fig 1: Disconnecting Negative Battery Cable
Courtesy of ISUZU MOTOR CO.
- Bank 1 sensor 1 is mounted on the exhaust pipe ahead of the right-hand catalytic converter.
  
  Fig 2: Identifying Bank 1 Sensor 1 Is Mounted On Exhaust Pipe
  Courtesy of ISUZU MOTOR CO.
- Bank 1 sensor 2 is mounted behind the right-hand catalytic converter.
  
  Fig 3: Identifying Bank 1 Sensor 2 Is Mounted Behind Right-Hand Catalytic Converter
  Courtesy of ISUZU MOTOR CO.
- Bank 2 sensor 1 is mounted on the exhaust pipe ahead of the left-hand catalytic converter.
  
  Fig 4: Identifying Bank 2 Sensor 1 Is Mounted On Exhaust Pipe
  Courtesy of ISUZU MOTOR CO.
- Bank 2 sensor 2 is mounted behind the left-hand catalytic converter.
Fig 5: Identifying Bank 2 Sensor 2 Is Mounted Behind Left-Hand Catalytic Converter
Courtesy of ISUZU MOTOR CO.
Disconnect the pigtail from the wiring harness.

Fig 6: Disconnecting Pigtail From Wiring Harness
Courtesy of ISUZU MOTOR CO.

IMPORTANT: The pigtail is permanently attached to the sensor. Be careful not to pull The wires out.

NOTE: Do not use a torch to remove an HO2S unless the sensor is being replaced. Using a torch could damage the sensor.
Remove the sensor from the exhaust pipe.
- Because of the expansion and contraction of the metal in the exhaust system over time, this may be difficult if the engine temperature is below 48°C (120°F).

Fig 7: Removing Sensor From Exhaust Pipe

Courtesy of ISUZU MOTOR CO.