Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Installation

INSTALLATION

PROCEDURE

1. INSTALL HEATED OXYGEN SENSOR (for Bank 2)

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2. INSTALL FRONT EXHAUST PIPE ASSEMBLY

(a) Install a new exhaust pipe gasket to the front exhaust pipe assembly.

(b) Install the front exhaust pipe assembly to the exhaust manifold assembly LH (TWC: Front Catalyst) with the 2 nuts.

Torque:

55 N·m {561 kgf·cm, 41 ft·lbf}

(c) Connect the heated oxygen sensor (for Bank 2) connector.

(d) Engage the 2 wire harnesses clamps.

3. INSTALL NO. 1 EXHAUST PIPE SUPPORT BRACKET (for Lower Side)

(a) Install the No. 1 exhaust pipe support bracket with the 2 bolts.

Torque:

21 N·m {214 kgf·cm, 15 ft·lbf}

4. INSTALL HEATED OXYGEN SENSOR (for Bank 1)

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5. INSTALL FRONT NO. 3 EXHAUST PIPE SUB-ASSEMBLY

(a) Install 2 new exhaust pipe gaskets to the front No. 3 exhaust pipe sub-assembly.

(b) Install the front No. 3 exhaust pipe sub-assembly to the front exhaust pipe assembly and exhaust manifold (TWC: Front Catalyst) with the 2 bolts and 2 nuts.

Torque:

55 N·m {561 kgf·cm, 41 ft·lbf}

(c) Connect the heated oxygen sensor (for Bank 1) connector.

(d) Engage the 4 wire harness clamps.

6. INSTALL CENTER EXHAUST PIPE ASSEMBLY (TWC: Rear Catalyst)

(a) Using a vernier caliper, measure the free length of the 2 compression springs. Standard Length 43.0 mm (1.69 in.) Minimum Free Length 41.5 mm (1.63 in.) If the free length is less than minimum, replace the compression spring.

(b) Temporarily install a new exhaust pipe gasket to the front No. 3 exhaust pipe sub-assembly.

(c) Using a plastic hammer and wooden block, tap in the exhaust pipe gasket until its surface is flush with the front No. 3 exhaust pipe sub-assembly. NOTICE: Be careful with the installation direction of the exhaust pipe gasket. Do not reuse the exhaust pipe gasket. Do not damage the exhaust pipe gasket. Do not push in the exhaust pipe gasket by using the exhaust pipes when connecting them.

*1 Front No. 3 Exhaust Pipe Sub-assembly *2 Exhaust Pipe Gasket *a Wooden Block

(d) Connect the center exhaust pipe assembly (TWC: Rear Catalyst) to the 2 exhaust pipe supports.

(e) Install the center exhaust pipe assembly (TWC: Rear Catalyst) to the front No. 3 exhaust pipe sub-assembly with the 2 bolts and 2 compression springs.

Torque:

43 N·m {438 kgf·cm, 32 ft·lbf}

HINT:

After installation, check that the space between the flanges of the center exhaust pipe assembly (TWC: Rear Catalyst) and front No. 3 exhaust pipe sub-assembly is consistent front-to-rear and left-to-right.

7. INSTALL TAIL EXHAUST PIPE ASSEMBLY (w/o Rear No. 2 Seat)

(a) Install a new exhaust pipe gasket to the center exhaust pipe assembly (TWC: Rear Catalyst).

(b) Connect the tail exhaust pipe assembly to the 2 exhaust pipe supports.

(c) Install the tail exhaust pipe assembly to the center exhaust pipe assembly (TWC: Rear Catalyst) with the 2 bolts.

Torque:

55 N·m {561 kgf·cm, 41 ft·lbf}

8. INSTALL TAIL EXHAUST PIPE ASSEMBLY (w/ Rear No. 2 Seat)

(a) Install a new exhaust pipe gasket to the center exhaust pipe assembly (TWC: Rear Catalyst).

(b) Connect the tail exhaust pipe assembly to the 4 exhaust pipe supports.

(c) Install the tail exhaust pipe assembly to the center exhaust pipe assembly (TWC: Rear Catalyst) with the 2 bolts.

Torque:

55 N·m {561 kgf·cm, 41 ft·lbf}

9. INSTALL NO. 2 TAIL EXHAUST PIPE ASSEMBLY (w/o Rear No. 2 Seat)

(a) Install a new exhaust pipe gasket to the tail exhaust pipe assembly.

(b) Connect the No. 2 tail exhaust pipe assembly to the 2 exhaust pipe supports.

(c) Install the No. 2 tail exhaust pipe assembly to the tail exhaust pipe assembly with the 2 bolts.

Torque:

55 N·m {561 kgf·cm, 41 ft·lbf}

10. INSPECT FOR EXHAUST GAS LEAK

If gas is leaking, tighten the areas necessary to stop the leak. Replace damaged parts as necessary.

(a) Perform Inspection After Repair after repairing an exhaust gas leak.

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11. INSTALL FRONT FLOOR COVER LH

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