Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 for Chevrolet Impala 2009

Caution: Refer to Heated Oxygen and Oxygen Sensor Caution in the Preface section.

1. Remove the intake manifold sight shield. Refer to Upper Intake Manifold Sight Shield Replacement.
2. Remove the connector position assurance (CPA) retainer (1).
3. Disconnect the bank 1 sensor 1 electrical connector (2).



4. Remove the bank 1 sensor 1 from the exhaust manifold.

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 reinstallation.

1. If re-installing the old sensor, coat the threads with anti-seize compound P/N 12377953, or equivalent.

Caution: Refer to Fastener Caution in the Preface section.

2. Install the bank 1 sensor 1 to the exhaust manifold.

Tighten
Tighten the sensor to 42 N·m (31 lb ft).




3. Connect the bank 1 sensor 1 electrical connector (2).
4. Install the CPA retainer (1).
5. Install the intake manifold sight shield. Refer to Upper Intake Manifold Sight Shield Replacement.