GM 19178924
Oxygen Sensor

The necessary tools for heated Oxygen Sensor (HO2S) replacement include an Oxygen Sensor wrench (J 39194). Oxygen Sensor wrench (J 39194). The ho2s along with the Oxygen Sensor retains their connector-pigtail permanently so do not detach them to prevent sensor dysfunction. The handling of ho2s and o2s must preserve their in-line electrical connector along with louvered end by keeping them clean from contamination and grease using no cleaning fluids. Start the inspection process with engine off while supporting the vehicle at its height. Start removal by taking off both the splash shield and ho2s electrical connector retaining tab that secures the connector. The ho2s electrical connector loses its Oxygen Sensor connector while being unlinked for servicing. Before attempting Oxygen Sensor removal operators need to wait until engine temperature drops below 48°c (120°F) because higher temperatures lead to installation challenges. The Oxygen Sensor wrench (J 39194) should be used to separate the Oxygen Sensor from its position inside the Exhaust Pipe. Reused sensor threads should receive special anti-seize compound treatment before installation by using p/n 5613695 or equivalent if necessary. The exhaust installation of the Oxygen Sensor requires a torque of 41 n.m (30 lb ft) for proper tightening. Position the ho2s connector to the ho2s electrical connector and return the retaining tab to its position on the ho2s electrical connector. Complete installation by adding the front splash shield then lowering the vehicle.

Service procedures for heated oxygen sensors (Bank 1 HO2S 1 and Bank 2 HO2S 1) require the sensor to maintain pigtail and connector attachment to prevent impact on functionality. You need to handle the sensor gently in order to maintain the in-line electrical connector and louvered end clear of dirt and grease and chemical-free from contaminants during removal. The sensor becomes challenging to take out when engine temperature remains below 48°c (120°F) since using too much strength can harm Exhaust Manifold threads along with pipe threads. Start by supporting the vehicle then detach the electrical connector of the ho2s before slowly removing the heated Oxygen Sensor. To make future removal easier the installation process requires application of p/n 5613695 anti-seize compound to heated Oxygen Sensor threads where the compound combines graphite and glass beads to help sensor removal. Tighten the heated Oxygen Sensor by hand to 42 n.m (31 lb ft) torque spec after connecting the ho2s electrical connector.

The first step to replace the Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 involves vehicle elevation. First disconnect the connector for the HO2S before removing the HO2S with the Oxygen Sensor Wrench (J 39194-B). Prior to sensor installation you should apply GM P/N 5613695 anti-seize compound to threads if needed because this compound made from liquid graphite and glass beads will help with future sensor removal procedures. Use the Oxygen Sensor Wrench (J 39194-B) to install the HO2S then fasten it to a torque of 42 N.m (31 lb ft). Use the oxygen sensor wrench to connect the HO2S harness connector then lower the vehicle.

Reinstall the fuel injection sight shield.

Disconnect the oxygen sensor connector from the HO2S electrical connector.

A special anti-seize compound, using P/N 5613695 or equivalent.

Remove the oxygen sensor from the exhaust pipe with the J 39194.

Coat the threads with anti-seize compound P/N 5613695 or equivalent.

A special anti-seize compound, such as P/N 5613695 or equivalent, should be applied.

New service sensors should already have this compound, while reused sensors should be coated with anti-seize compound P/N 5613695 or equivalent.

Remove the HO2S retaining clip from the bracket and disconnect the HO2S electrical connector tab from the retaining clip, followed by the removal of the electrical connector retainer.

Remove the HO2S retaining clip from the bracket and disconnect the HO2S electrical connector tab from the retaining clip, followed by the removal of the electrical connector retainer.

Reused sensors should be coated with anti-seize compound P/N 5613695 or equivalent.

Handle them with care, keeping the in-line electrical connector and louvered end free from grease, dirt, or contaminants, and avoid using any cleaning solvents.

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

First, raise the vehicle.

Carefully back out the heated oxygen sensor, ensuring the in-line electrical connector and louvered end are free of grease, dirt, or other contaminants.

Hand start the heated oxygen sensor and tighten it to 42 N.m (31 lb ft).

Disconnect the HO2S electrical connector.

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

Install the HO2S using the Oxygen Sensor Wrench (J 39194-B) and tighten it to 42 N.m (31 lb ft).

Do not apply contact cleaner or other materials, as this may impair performance.

Handle it carefully, avoiding drops and keeping the in-line electrical connector and louvered end free of grease, dirt, or contaminants.

The J 39194-B Heated Oxygen Sensor Wrench (J 39194-B) is used for removal.

Use the J 39194-B heated oxygen wrench to carefully back out the heated oxygen sensor.

Do not repair any damaged wiring, connectors, or terminals; instead, replace the oxygen sensor if any damage is present.

The anti-seize compound consists of liquid graphite and glass beads to facilitate future removal.

Use the J 39194-B heated oxygen sensor wrench to carefully back out the sensor.

Use the Oxygen Sensor Wrench (J 39194-B) to install it.