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Oxygen Sensors (5.3L): Installation

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  1. Connect the HO2S electrical connector (3). See Fig 1.
  2. Install the CPA retainer.
  3. Install the catalytic converter.
    NOTE: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.
  4. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N (12377953).
    NOTE: If the HO2S sensor is connected to the main wiring harness during installation. Rotate the HO2S sensor several turns counterclockwise before threading the HO2S sensor into the catalytic converter. This action of initially reverse winding of the pigtail wires will prevent a condition where the HO2S sensor pigtail wires become severely twisted or binding once the HO2S sensor is installed into the catalytic converter.
  5. Install the HO2S (2). See Fig 2. Tighten the sensor to specification. See TORQUE SPECIFICATIONS .
Fig 1: Removing & Installing HO2S, Bank 1 Sensor 1 (1 Of 2)
G00256489Courtesy of GENERAL MOTORS CORP.
Fig 2: Removing & Installing HO2S, Bank 1 Sensor 1 (2 Of 2)
G00256490Courtesy of GENERAL MOTORS CORP.


NOTE: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.
  1. If reinstalling the old sensor, coat the threads with Anti-Seize Compound GM P/N (12377953).
  2. Install the HO2S (2). See Fig 2 and Fig 3 . Tighten the sensor to specification. See TORQUE SPECIFICATIONS .
  3. Connect the HO2S electrical connector.
  4. Install the CPA retainer. See Fig 1.
  5. Lower the vehicle.
Fig 1: Removing & Installing HO2S, Bank 1 Sensor 2 (1 Of 3)
G00256491Courtesy of GENERAL MOTORS CORP.
Fig 2: Removing & Installing HO2S, Bank 1 Sensor 2 (2 Of 3)
G00256492Courtesy of GENERAL MOTORS CORP.
Fig 3: Removing & Installing HO2S, Bank 1 Sensor 2 (3 Of 3)
G00256493Courtesy of GENERAL MOTORS CORP.
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