Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Removal

REMOVAL

CAUTION / NOTICE / HINT

The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during exhaust manifold (TWC: Front Catalyst) and exhaust manifold assembly LH (TWC: Front Catalyst) removal/installation are shown below.

PROCEDURE

1. DRAIN ENGINE COOLANT

Click here

2. REMOVE FRONT WHEEL RH

3. REMOVE NO. 2 ENGINE UNDER COVER

Click here

4. REMOVE AIR FUEL RATIO SENSOR (for Bank 1)

Click here

5. REMOVE FRONT FLOOR COVER LH

(a) Remove the clip (A), 2 screws and 4 bolts from the front floor cover LH.

*A	for TMC Made
*B	for TMMC Made
	Bolt
	Screw

(b) Disconnect the 2 clips (B) to remove the front floor cover LH.

6. REMOVE FRONT NO. 3 EXHAUST PIPE SUB-ASSEMBLY

CAUTION:

To prevent burns, do not touch the engine, exhaust pipe or other high temperature components while the engine is hot.

(a) Disengage the 4 wire harness clamps.

(b) Disconnect the heated oxygen sensor (for Bank 1) connector.

(c) Remove the 4 bolts, 2 nuts and 2 compression springs and front No. 3 exhaust pipe sub-assembly from the front exhaust pipe assembly and center exhaust pipe sub-assembly (TWC: Rear Catalyst).

	Bolt
	Nut

(d) Remove the 3 exhaust pipe gaskets from the front No. 3 exhaust pipe sub-assembly, front exhaust pipe assembly and center exhaust pipe sub-assembly (TWC: Rear Catalyst).

7. REMOVE MANIFOLD STAY

CAUTION:

To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.

(a) Remove the bolt and nut to remove the manifold stay from the exhaust manifold (TWC: Front Catalyst) and rear engine mounting bracket.

	Bolt
	Nut

8. REMOVE EXHAUST MANIFOLD (TWC: Front Catalyst)

CAUTION:

To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.

(a) Using a 12 mm deep socket wrench, remove the 4 nuts and exhaust manifold (TWC: Front Catalyst) from the cylinder head sub-assembly RH.

9. REMOVE EXHAUST MANIFOLD TO HEAD GASKET (for Bank 1)

(a) Remove the exhaust manifold to head gasket from the cylinder head sub-assembly RH.

10. REMOVE NO. 1 EXHAUST PIPE SUPPORT BRACKET (for Lower Side)

Click here

11. REMOVE FRONT EXHAUST PIPE ASSEMBLY

Click here

12. REMOVE ENGINE OIL LEVEL DIPSTICK GUIDE

Click here

13. REMOVE V-BANK COVER SUB-ASSEMBLY

Click here

14. REMOVE NO. 2 EXHAUST MANIFOLD HEAT INSULATOR

CAUTION:

To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.

(a) Disconnect the air fuel ratio sensor connector.

(b) Disengage the wire harness clamp.

(c) Remove the 3 bolts and No. 2 exhaust manifold heat insulator from the exhaust manifold assembly LH (TWC: Front Catalyst).

15. REMOVE AIR FUEL RATIO SENSOR (for Bank 2)

Click here

16. REMOVE NO. 2 MANIFOLD STAY

CAUTION:

To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.

(a) Remove the bolt and nut and No. 2 manifold stay from the exhaust manifold assembly LH (TWC: Front Catalyst) and cylinder block sub-assembly.

	Bolt
	Nut

17. REMOVE EXHAUST MANIFOLD ASSEMBLY LH (TWC: Front Catalyst)

CAUTION:

To prevent burns, do not touch the engine, exhaust manifold or other high temperature components while the engine is hot.

(a) Disconnect the 2 No. 2 cooling fan motor connectors.

(b) Slide the clip and disconnect the No. 1 radiator hose from the radiator assembly.

(c) Using a 12 mm deep socket wrench, remove the 4 nuts and exhaust manifold assembly LH (TWC: Front Catalyst).

18. REMOVE EXHAUST MANIFOLD TO HEAD GASKET (for Bank 2)

(a) Remove the exhaust manifold to head gasket from the cylinder head sub-assembly.

19. REMOVE STUD BOLT

HINT:

If a stud bolt is deformed or its threads are damaged, replace it.

(a) Using an E8 "TORX" socket wrench, remove the 2 stud bolts from the exhaust manifold (TWC: Front Catalyst).

(b) Using an E8 "TORX" socket wrench, remove the 2 stud bolts from the exhaust manifold assembly LH (TWC: Front Catalyst).