Installation [11/2021 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus IS 500, 2023 Lexus IS 500, and 2022 Lexus IS 500. However, it is still accessible from the selected car via links, so may be relevant.

INSTALL TAIL EXHAUST PIPE BAFFLE SUB-ASSEMBLY

Set 4 new tail exhaust pipe baffle sub-assemblies to the tail exhaust pipe assembly and tail exhaust pipe LH.

Align the cutout of each tail exhaust pipe baffle sub-assembly with the protrusion of the tail exhaust pipe assembly and tail exhaust pipe LH as shown in the illustration.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Plastic Hammer
*b	Protrusion
*c	Cutout

Using a plastic hammer, uniformly tap each tail exhaust pipe baffle sub-assembly onto the tail exhaust pipe assembly and tail exhaust pipe LH.

Check that the cutout of each tail exhaust pipe baffle sub-assembly is aligned with the protrusion on the bottom of the tail exhaust pipe assembly and tail exhaust pipe LH as shown in the illustration.

HINT:

Adjust the tail exhaust pipe baffle sub-assemblies if necessary.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Tail Exhaust Pipe Baffle Sub-assembly Edge
*b	Protrusion
*c	Cutout

CONNECT TAIL EXHAUST PIPE LH
1. Connect the tail exhaust pipe LH to the 3 exhaust pipe supports.
  NOTE:
  Protect the rear bumper assembly using protection material such as a piece of cloth to avoid damage by the tail exhaust pipe baffle sub-assemblies.
CONNECT TAIL EXHAUST PIPE ASSEMBLY
1. Connect the tail exhaust pipe assembly to the 3 exhaust pipe supports.
  NOTE:
  Protect the rear bumper assembly using protection material such as a piece of cloth to avoid damage by the tail exhaust pipe baffle sub-assemblies.

INSTALL FRONT EXHAUST PIPE ASSEMBLY (TWC: Rear Catalyst)

Using a vernier caliper, measure the free length of the compression springs.

Standard Length	40 mm (1.57 in.)
Minimum Free Length	38.5 mm (1.52 in.)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If the free length is less than the minimum, replace the compression spring.

Temporarily install 2 new exhaust pipe gaskets to the front exhaust pipe assembly (TWC: Rear Catalyst) for tail exhaust pipe assembly and tail exhaust pipe LH side.

Using a plastic hammer and wooden block, tap in each exhaust pipe gasket until its surface is flush with the front exhaust pipe assembly (TWC: Rear Catalyst).

NOTE:

Be sure to install the exhaust pipe gaskets in the correct direction.
Do not reuse the exhaust pipe gaskets.
Do not damage the exhaust pipe gaskets.
Do not push in the exhaust pipe gaskets by using the exhaust pipes when connecting them.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	Front Exhaust Pipe Assembly (TWC: Rear Catalyst)
*2	Exhaust Pipe Gasket
*a	Wooden Block

Install 2 new exhaust pipe gaskets to the front exhaust pipe assembly (TWC: Rear Catalyst) for exhaust manifold sub-assembly LH (TWC: Front Catalyst) and exhaust manifold sub-assembly RH (TWC: Front Catalyst) side.
Connect the front exhaust pipe assembly (TWC: Rear Catalyst) with 4 new nuts and 4 new bolts.
Torque: 39 N.m (398 kgf/cm, 29 ft.lbf)

Install the front exhaust pipe assembly (TWC: Rear Catalyst) to the tail exhaust pipe assembly and tail exhaust pipe LH with the 4 bolts and 4 compression springs.

Torque: 43 N.m (438 kgf/cm, 32 ft.lbf)

HINT:

After installation, check that the space between the flanges of the front exhaust pipe assembly (TWC: Rear Catalyst) and tail exhaust pipe assembly and tail exhaust pipe LH is consistent front-to-rear and left-to-right.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	Tail Exhaust Pipe Assembly or Tail Exhaust Pipe LH
*2	Front Exhaust Pipe Assembly (TWC: Rear Catalyst)
*3	Exhaust Pipe Gasket
*a	Space between Flanges: 6.5 mm (0.256 in.)

CONNECT HEATED OXYGEN SENSOR

HINT:

Perform "Inspection After Repair" after replacing a heated oxygen sensor.

Refer to INITIALIZATION [11/2021 - ]

for Bank 2:

Before installing the heated oxygen sensor, twist the sensor wire counterclockwise 4 turns.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

4 Turns

Using SST, connect the heated oxygen sensor to the front exhaust pipe assembly (TWC: Rear Catalyst).

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Torque Wrench Fulcrum Length

SST: 09224-00011

Specified tightening torque

Torque: 44 N.m (449 kgf/cm, 32 ft.lbf)

NOTE:

Be careful not to drop the heated oxygen sensor.

HINT:

Calculate the torque wrench reading when changing the fulcrum length of the torque wrench.
Refer to PRECAUTION [09/2020 - ]
When using SST (fulcrum length of 30 mm (1.18 in.)) + torque wrench (fulcrum length of 260 mm (10.2 in.)):
39 N.m (398 kgf/cm, 29 ft.lbf)

Engage the heated oxygen sensor grommet to the vehicle body.

for Bank 1:

Before installing the heated oxygen sensor, twist the sensor wire counterclockwise 4 turns.

4 Turns

Using SST, connect the heated oxygen sensor to the front exhaust pipe assembly (TWC: Rear Catalyst).

*a	Torque Wrench Fulcrum Length

SST: 09224-00011

Specified tightening torque

Torque: 44 N.m (449 kgf/cm, 32 ft.lbf)

NOTE:

Be careful not to drop the heated oxygen sensor.

HINT:

Calculate the torque wrench reading when changing the fulcrum length of the torque wrench.
Refer to PRECAUTION [09/2020 - ]
When using SST (fulcrum length of 30 mm (1.18 in.)) + torque wrench (fulcrum length of 260 mm (10.2 in.)):
39 N.m (398 kgf/cm, 29 ft.lbf)

Engage the heated oxygen sensor grommet to the vehicle body.

INSTALL FRONT CENTER FLOOR BRACE
Refer to PROCEDURE - Step 46
INSTALL REAR NO. 2 FLOOR BOARD SUB-ASSEMBLY
Refer to PROCEDURE - Step 74
INSTALL REAR NO. 1 FLOOR BOARD SUB-ASSEMBLY
Refer to PROCEDURE - Step 75
INSPECT FOR EXHAUST GAS LEAK
If gas is leaking, tighten the areas necessary to stop the leak. Replace damaged parts as necessary.
1. Perform "Inspection After Repair" after repairing an exhaust gas leak.
  Refer to INITIALIZATION [11/2021 - ]