GM 12594452
Oxygen Sensor

The first step to replace the bank 2 sensor 1 heated Oxygen Sensor (HO2S) is to take off the fuel injector sight shield. The installation requires disconnecting the ho2s electrical connector from the engine wiring harness electrical connector and dislodging the retainer securing it onto the harness clip. Before proceeding remove the ho2s from its position inside the Exhaust Manifold. For reuse of the original sensor during installation it is essential to apply anti-seize compound gm p/n 12377953 as well as equivalent products to the sensor threads because the ho2s features a special anti-seize compound made of liquid graphite and glass beads for easy removal. Fasten the ho2s on the Exhaust Manifold at 42 n.m torque (31 lb ft). Install ho2s electrical connector retainer to the engine wiring harness clip by connecting the engine wiring harness electrical connector to the ho2s electrical connector before placing the fuel injector sight shield back position.

The J 39194-B Heated Oxygen Sensor Wrench (J 39194-B) must be used to remove the Heated Oxygen Sensor 2 while maintaining the integrity of both sensor's pigtail connections since removal may damage operational functionality. The oxygen sensor requires careful handling to prevent drops while preserving both the in-line electrical connector and louvered end free from contaminants and dirt and grease. The sensor and vehicle harness connectors should never receive contact cleaner or similar materials. Additionally maintain safe conditions around the sensor pigtail and harness wires to prevent damage. Managing the lead wires by avoiding bends and keeping the oxygen sensor ground wire in position will maintain your engine performance. The vehicle harness connector peripheral seal must stay intact to stop water infiltration while you use Packard's Crimp and Splice Seals Terminal Repair Kit for fixes instead of soldering. Secure removal of the heated oxygen sensor requires engine temperatures at or above 48°C (120°F) to avoid breaking the thread connection. Turn OFF the ignition followed by vehicle lift then disconnect the sensor harness connector. Using the J 39194-B back out the heated oxygen sensor. Special thread protection comes in the form of anti-seize compound GM P/N 5613695 or its equivalent which must be applied to the heated oxygen sensor threads during installation. Embed the HO2S 2 sensor and apply 41 N.m (30 lb ft) torque while connecting its electrical connector and returning the vehicle to the ground.

Vehicle support and elevation should become the first step for bank 1 sensor 2 heated Oxygen Sensor (HO2S) replacement. First remove the cpa retainer from the ho2s electrical connector then break its connection to the engine wiring harness electrical connector . Remove the ho2s from the Exhaust Pipe with caution to avoid damaging the pigtail and connectors because sensor performance may suffer from such damage. Apply anti-seize compound gm p/n 12377953 or equivalent with a special liquid graphite and glass bead composition to the ho2s threads to enhance sensor thread extraction before reinstalling the sensor. Tighten the install position of the ho2s on the Exhaust Pipe to 42 n.m (31 lb ft). Connect the ho2s electrical connector to the engine wiring harness electrical connector then place the cpa retainer before lowering the vehicle. The sensor performance requires the vehicle harness connector peripheral seal to stay intact along with protective measures against water entry and damage to wiring from contact cleaners and physical abuse.

To replace heated Oxygen Sensor 1, start by removing the cover of the intake manifold. Next, remove the connector position assurance (CPA) retainer and disconnect the engine harness, electrical connector from the ho2s connector. Then raise the vehicle and unhook the ho2s electrical connector from the ignition coil bracket and proceed to unhook the ho2s from the Exhaust Manifold. When installing the new sensor apply the anti-seize compound p/n 12377953 on the threads if using the old one, because the anti-seize compound, which contains liquid graphite and glass beads, makes removal easy. Mount the ho2s on the Exhaust Manifold and secure it with a torque of 42 n.m (31 lb ft). Reconnect the engine harness electrical connector to the ho2s connector, replace the cpa retainer, and then install the ho2s electrical connector to the ignition coil bracket. Lower the vehicle and then replace the intake manifold cover. Do not damage the pigtail or harness wires as well as the peripheral seal of the vehicle harness connector during the process to keep out water.

Changing the heated Oxygen Sensor (HO2S) for bank 2 sensor 2 requires maintenance personnel to avoid disconnecting the pigtail from either the ho2s or Oxygen Sensor (O2S) because it can harm sensor operation. Stay cautious with the Oxygen Sensor by preventing drops from happening and maintain the in-line electrical connector and louvered end clean from contaminants along with avoiding any cleaning solvents. The Oxygen Sensor needs replacement rather than repair when the pigtail wiring or connector or terminal shows any damage because such modifications affect air reference pathways and reduce sensor quality. Rarely use contact cleaner with sensor or vehicle harness connectors because applying it harms sensor pigtail wires and harness wires which can create performance issues when sharp bends form in lead wires. Keep the Oxygen Sensor ground wire in place whenever possible because it functions as the primary sensor grounding point and maintain the peripheral seal on the vehicle harness connector to stop water damage. The packard crimp and splice seals terminal repair kit serves as an alternative for engine harness repairs instead of soldering processes. Start the uninstallation process by eliminating the connector position assurance (CPA) retainer then unplug the ho2s electrical connector from the engine wiring harness electrical connector. First increase the vehicle height while providing support and remove the ho2s unit from the Exhaust Pipe. During installation you must use the anti-seize compound gm p/n 12377953 on the old sensor threads when reusing it since new sensors arrive with pre-applied coating. Install the ho2s to the Exhaust Pipe then use torque to a maximum of 42 n.m (31 lb ft). The installation process requires reconnecting the ho2s electrical connector between the engine wiring harness electrical connector before returning the cpa retainer and lowering the vehicle.

Install the HO2S to the exhaust manifold and tighten it to 42 Nm (31 lb ft).

Carefully handle the oxygen sensor to avoid dropping it and ensure the in-line electrical connector and louvered end remain free of grease, dirt, or contaminants; do not use any cleaning solvents.

Begin by disconnecting the HO2S 1 harness connector.

Begin by removing the connector position assurance (CPA) retainer.

Use the Oxygen Sensor Wrench (J 39194-C) to remove the HO2S.

The Oxygen Sensor Wrench (J 39194-C).

Remove the upper intake manifold.

Reconnect the engine harness electrical connector to the HO2S connector and install the CPA retainer.

Remove the HO2S from the exhaust pipe.