Catalytic Converter Replacement - Left Side

Catalytic Converter Replacement - Left Side (LZ4) (3.5L)

Special Tools

J 39194-B Heated Oxygen Sensor Wrench

Removal Procedure




1. Remove the left catalytic converter nuts (1) at the exhaust manifold.
2. Remove the muffler assembly. Refer to Exhaust Muffler Replacement (LE5 or LE9 With MH8) Service and RepairExhaust Muffler Replacement (2.4L, 3.5L, and 3.9L) Service and RepairExhaust Muffler Replacement (LY7, LZ9) Service and Repair.




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

Note: 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).

Note: 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.

* 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 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).

Caution: Refer to Fastener Caution Fastener Caution.

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

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




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

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




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

Tighten the sensor to 42 Nm (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 Exhaust Muffler Replacement (LE5 or LE9 With MH8) Service and RepairExhaust Muffler Replacement (2.4L, 3.5L, and 3.9L) Service and RepairExhaust Muffler Replacement (LY7, LZ9) Service and Repair.




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

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

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