Catalytic Converter Replacement - Left Side LZ4

Tools Required

J 39194-B Heated Oxygen Sensor Wrench

1. Remove the left catalytic converter nuts (1) at the exhaust manifold.
2. Remove the muffler assembly. Refer to Muffler Replacement .



3. Remove the rear heated oxygen sensor (HO2S) connector position assurance (CPA) retainer (1).

Important: The HO2S uses a permanently attached pigtail and connector. This pigtail should not be removed from the sensor. Damage or removal of the pigtail or connector will affect proper operation of the sensor.

4. Disconnect the rear HO2S electrical connector (2).



5. Remove the front HO2S CPA retainer (2).

Important: The HO2S uses a permanently attached pigtail and connector. This pigtail should not be removed from the sensor. Damage or removal of the pigtail or connector will affect proper operation of the sensor.

6. Disconnect the front HO2S electrical connector (1).



7. Remove the front and rear HO2S (1, 2) using the J 39194-B .



8. Remove the right catalytic converter bolt (4) and nuts (1) at the exhaust manifold.
9. Remove and discard the gasket (2).
10. Remove the right catalytic converter (3).



11. Remove the left catalytic converter to right catalytic converter nuts (3). (Powertrain shown removed for clarity).
12. Remove the left catalytic converter (1).
13. Remove and discard the left catalytic converter to manifold gasket.
14. Inspect the catalytic converter-to-exhaust manifold flange.

Catalytic Converter to Manifold Flange Warpage:

•	Service Limit: 0.7 mm (0.028 in) max.

•	Standard: 0.7 mm (0.028 in) max.

1. Install a NEW gasket to the front catalytic converter studs.
2. Install the left catalytic converter (1).
3. Install a NEW gasket (2) to the right catalytic converter studs.
4. Install the right catalytic converter (3).

Notice: Refer to Fastener Notice in the Preface section.

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

Tighten
Tighten the bolt and nuts to 31 N·m (23 lb ft).




6. Install the left catalytic converter to right catalytic converter nuts (3). (Powertrain shown removed for clarity).

Tighten
Tighten the nuts to 31 N·m (23 lb ft).




7. Install the front and rear HO2S (1, 2) using the J 39194-B .

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




8. Connect the front HO2S electrical connector (1).
9. Install the front HO2S CPA retainer (2).



10. Disconnect the rear HO2S electrical connector (2).
11. Install the rear HO2S CPA retainer (1).
12. Install the muffler assembly. Refer to Muffler Replacement .



13. Install the left catalytic converter nuts (1) at the exhaust manifold.

Tighten
Tighten the nuts to 31 N·m (23 lb ft).

14. Start the engine, and check for exhaust leaks.