Catalytic Converter Replacement - Right Side (M15)

Catalytic Converter Replacement - Right Side (LZ9 w/RPO M15)

Special Tools

J 39194-B Heated Oxygen Sensor Wrench

Removal Procedure




1. Remove the muffler assembly. Refer to Exhaust Muffler Replacement (LE5 or LE9 With MH8) Exhaust Muffler ReplacementExhaust Muffler Replacement (2.4L, 3.5L, and 3.9L) Exhaust Muffler ReplacementExhaust Muffler Replacement (LY7, LZ9) Exhaust Muffler Replacement.
2. Remove the rear stabilizer shaft. Refer to Stabilizer Shaft Replacement Rear Suspension.
3. Remove the connector position assurance (CPA) retainer (1).
4. Disconnect the lower right heated oxygen sensor (HO2S) electrical connector (2).





Caution: The oxygen sensor uses a permanently attached pigtail and connector. Do not remove the pigtail from the oxygen sensor. Damage to or removal of the pigtail connector could affect proper operation of the oxygen sensor.

5. Remove the lower right HO2S (2) using the J 39194-B .




6. Remove the left (front) catalytic converter to right (rear) catalytic converter nuts (3).
7. Remove the right (rear) catalytic converter bolt (5) and nuts (1) at the exhaust manifold.
8. Remove the right catalytic converter (2).
9. Remove and discard the gasket (6).
10. Inspect the catalytic converter-to-exhaust manifold flange.

* Service Limit: 0.7 mm (0.028 in) max.
* Standard: 0.7 mm (0.028 in) max.

Installation Procedure




1. Install a NEW gasket to the catalytic converter.
2. Install the right (rear) catalytic converter (2).

Caution: Refer to Fastener Caution Fastener Caution.

3. Install the right (rear) catalytic converter bolt (4) and nuts (1) at the exhaust manifold.

Tighten the nuts to 45 Nm (33 lb ft).

4. Install the left (front) catalytic converter to right (rear) catalytic converter nuts (3).

Tighten the nuts to 22 Nm (16lb ft).





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 beads remain, making the sensor easier the 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 be have anti-seize compound applied before the reinstallation.

5. If reinstalling the old HO2S, coat the threads with anti-seize compound GM P/N 12377953 or equivalent.
6. Install the HO2S (2) using the J 39194-B .

Tighten the sensor to 42 Nm (31 lb ft).




7. Connect the lower right HO2S electrical connector (2).
8. Install the CPA retainer (1).
9. Ensure that the HO2S connector clip (3) is attached to the stud on the engine.
10. Install the rear stabilizer shaft. Refer to Stabilizer Shaft Replacement Rear Suspension.
11. Install the muffler assembly. Refer to Exhaust Muffler Replacement (LE5 or LE9 With MH8) Exhaust Muffler ReplacementExhaust Muffler Replacement (2.4L, 3.5L, and 3.9L) Exhaust Muffler ReplacementExhaust Muffler Replacement (LY7, LZ9) Exhaust Muffler Replacement.
12. Perform the engine mount position adjustment procedure. Refer to Engine Mount Position Adjustment .
13. Start the engine, and check for exhaust leaks.