GM 19178747
Oxygen Sensor

The replacement process for Heated Oxygen Sensors (HO2S) starts with lifting and supporting the vehicle. Disconnect the HO2S electrical connector. Special anti-seize compound which includes graphite suspended in fluid with glass beads must be used on the heated oxygen sensor threads because it provides both thread protection and ease of sensor removal. After the graphite material burns out during sensor use the glass beads inside will stay behind to help simplify sensor extraction. A special anti-seize compound is already present on new sensors as well as replacement parts. Before reinstalling an HO2S sensor operators must reapply anti-seize compound to its threads. For HO2S removal employ the Heated Oxygen Sensor Wrench (J 39194-B). When installing the HO2S threads should receive a coat of anti-seize compound P/N 12377953 or alternative product if required. Use the Heated Oxygen Sensor Wrench (J 39194-B) to install the heated oxygen sensor then torque the sensor to 42 N.m (31 lb ft). Reconnect the HO2S electrical connector after finishing your work by lowering the vehicle.

For ho2s replacement work you need these tools: Oxygen Sensor wrench (J 39194). Oxygen Sensor wrench (J 39194). Handle both ho2s and Oxygen Sensor components with care while protecting the in-line electrical connector and louvered end from grease or contaminant exposure. Do not use any cleaning solvents during this process. Sensor removal must wait until the engine temperature reaches above 48°c (120°F) so the sensor becomes easy to extract. First disconnect the ho2s electrical connector and remove its retaining clip after dismantling the fuel injector sight shield. Move the ho2s electrical connector off its bracket mounting position. Use the Oxygen Sensor wrench j 39194 for safe removal of the right Exhaust Manifold ho2s. A newly reused sensor requires application of anti-seize compound p/n 12377953 or alternative which should be applied to sensor threads when necessary. Fasten the ho2s onto the right Exhaust Manifold with the Oxygen Sensor wrench (J 39194) to achieve a torque of 41 n.m (30 lb ft). Reinstall the fuel injector sight shield following the bracket retainer installation alongside ho2s electrical connector reattaching and wiring harness electrical connector reconnecting to the ho2s.

The replacement of heated Oxygen Sensor (HO2S) requires using the Oxygen Sensor wrench (J 39194) as a necessary tool. Proper handling of both ho2s and o2s requires attention to their in-line electrical connector and louvered end so they stay free from debris and contaminants but never use cleaning fluids because of safety concerns. Before removing bank 1 sensor 2 always verify your engine temperature exceeds 48°c (120°F) since this will defend against Exhaust Manifold or Exhaust Pipe threading damage. Perform the following sequence to start: turn off the ignition followed by vehicle lifting and support installation. To remove the ho2s electrical connector, first push out the tab protecting the electrical connector then detach the Oxygen Sensor connection from the connector assembly. The Oxygen Sensor wrench (J 39194) will extract the Oxygen Sensor from the Exhaust Pipe. The Oxygen Sensor threads require installation with a special anti-seize compound. Treatment should be already present on fresh sensors. Oxygen sensors getting new service require existing anti-seize compound but when reinstalling used sensors they need equivalent anti-seize compound p/n 5613695. The Oxygen Sensor needs to be installed into the Exhaust Pipe at a wrench torque of 41 n.m (30 lb ft). Secure the ho2s connector to its electrical connector while installing the retaining tab before lowering the vehicle.

A heated Oxygen Sensor (HO2S) replacement begins with obtaining these essential tools: an Oxygen Sensor wrench (J 39194). Handle the ho2s sensor with great care while keeping the permanently attached pigtail and connector protected to maintain proper sensor functionality. Oxygen Sensor wrench (J 39194). Take proper precautions when handling ho2s because damage to its pigtail or connector will lead to sensor performance decline. Start by removing the sight shield from the fuel injector then remove the ho2s electrical cpa retainer before disconnecting the ho2s wiring harness connector from the electrical connector of the ho2s. Detach the ho2s electrical connector from its position on the fuel injector sight shield bracket. Engine temps should exceed 48°c (120°F) while performing this task because operating at lower temperatures can cause damage to Exhaust Manifold or pipe threads and make the process more difficult. You should use an Oxygen Sensor wrench (J 39194) to uninstall the ho2s. When installing the sensor apply a special anti-seize compound to the threads of new or reused components when necessary using p/n 12377953 or equivalent class of compounds. Use the Oxygen Sensor wrench (J 39194) to install the rear Oxygen Sensor into the right Exhaust Manifold with 41 n.m (30 lb ft) torque setting. After connecting the ho2s electrical connector to the wiring harness connector, secure the ho2s electrical connector to the fuel injector sight shield bracket before installing the ho2s electrical cpa retainer and putting the fuel injector sight shield back in place.

Use the Heated Oxygen Sensor Socket (J 39194-B).

Disconnect the electrical connector.

A special anti-seize compound consisting of graphite suspended in fluid and glass beads.

Ensure the rear oxygen sensor is placed in the right exhaust manifold, applying a special anti-seize compound to the threads of a reused sensor, using P/N 12377953 or equivalent.

Tighten it to 41 N.m (30 lb ft).

Lower the vehicle, reconnect the electrical connector to the HO2S, secure the electrical connector tab to the bracket, install the electrical connector retainer, and replace the fuel injection sight shield.

The J 39194 Oxygen Sensor Wrench (J 39194) is used for removal and installation.

Raise and support the vehicle.

Disconnect the HO2S sensor electrical connector and carefully back out the heated oxygen sensor.

The graphite will burn away, but the glass beads will remain, facilitating easier removal of the sensor.

Tighten it to 41 N.m (30 lb ft).

Coat the threads of the new or service HO2S 1 with anti-seize compound GM P/N 12377953 or an equivalent.

The Heated Oxygen Sensor Socket (J 39194-B).

The glass beads will remain, facilitating easier removal.

It consists of graphite and glass beads that facilitate future removal.

Tighten it to 41 N.m (30 lb ft).

A special anti-seize compound is used on its threads, consisting of graphite and glass beads.

Begin by raising and supporting the vehicle.

The necessary tool is the Oxygen Sensor Wrench (J 39194).

Raise and support the vehicle.

Install the HO2S 2 and use the Heated Oxygen Sensor Wrench (J 39194-B) to tighten the sensor to 41 N.m (30 lb ft).

Reconnect the HO2S1 sensor electrical connector.