Caution / Notice / Hint

WARNING: This page is about a different car, the 2025 Lexus NX 350h, 2024 Lexus NX 350h, 2023 Lexus NX 350h, and 2022 Lexus NX 350h. However, it is still accessible from the selected car via links, so may be relevant.

The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during cylinder head gasket removal/installation are shown below.

NECESSARY PROCEDURES AFTER PARTS REMOVED/INSTALLED/REPLACED

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function when Necessary Procedure not Performed	Link
Replacement of ECM	Update ECU security key	Vehicle Control History (RoB) are stored	Refer to UPDATE ECU SECURITY KEY [11/2021 - ]
Replacement of ECM	Perform Vehicle Identification Number (VIN) registration	DTC is output	Refer to REGISTRATION [11/2021 - ]
Replacement of throttle body with motor assembly Cleaning the deposits from the throttle body with motor assembly Replacement of cam timing control motor with EDU assembly1 Replacement of camshaft timing gear assembly1 Replacement of engine assembly Replacement of cylinder head sub-assembly Replacement of camshaft (for intake or exhaust camshaft) Replacement of camshaft timing exhaust gear assembly Replacement of port fuel injector assembly Replacement of direct fuel injector assembly Replacement of fuel (engine room side) pump assembly (for high pressure side) Replacement of ignition coil assembly Replacement of EGR valve assembly Gas leak from exhaust system is repaired	Inspection after repair	Poor idle, etc. Engine start function, etc.	Refer to INITIALIZATION [11/2021 - ]
Replacement of inverter with converter assembly	Resolver learning	DTCs are stored Slight vibration at a vehicle speed of 5 km/h (3 mph) or less Shock or vibration during acceleration	Refer to UTILITY [11/2021 - ]
Replacement of hybrid vehicle transaxle assembly	Resolver learning Initialize resolver		Refer to UTILITY [11/2021 - ]
Tires	Initialization23 Tire Position Identification23	Tire Pressure Warning System	Refer to Procedures Necessary When Replacing Parts (for Tire Pressure Warning System) table below Refer to WORK PROCEDURE [11/2021 - 03/2023] , or refer to WORK PROCEDURE [03/2023 - 03/2024] , or refer to WORK PROCEDURE [03/2024 - ]
	Rear television camera assembly optical axis (Back camera position setting)	Parking Assist Monitor System	Refer to CALIBRATION [11/2021 - ]
	Parking assist ECU initialization	Panoramic View Monitor System	Refer to CALIBRATION [11/2021 - 03/2024] , or refer to CALIBRATION [03/2024 - ]
	Parking assist ECU initialization	Advanced Park	Refer to CALIBRATION [11/2021 - 03/2024] , or refer to CALIBRATION [03/2024 - ]
Wheel alignment adjustment	Perform "Calibration"	DTCs are stored ABS warning light illuminates Brake system warning light (yellow indicator) illuminates Slip indicator light illuminates Electronically controlled brake system does not operate correctly	Refer to RESET MEMORY / CALIBRATION [11/2021 - ]
Steering intermediate shaft assembly*4	Automatic rack centering	-	Refer to AUTOMATIC RACK CENTERING [11/2021 - ]
Replacement of front bumper assembly*1	Front television camera view adjustment	Panoramic View Monitor System	Refer to CALIBRATION [11/2021 - 03/2024] , or refer to CALIBRATION [03/2024 - ]
Replacement of front bumper assembly*1	Front television camera view adjustment	Advanced Park	Refer to CALIBRATION [11/2021 - 03/2024] , or refer to CALIBRATION [03/2024 - ]
Suspension parts	Rear television camera assembly optical axis (Back camera position setting)	Parking Assist Monitor System	Refer to CALIBRATION [11/2021 - ]
	Parking assist ECU initialization	Panoramic View Monitor System	Refer to CALIBRATION [11/2021 - 03/2024] , or refer to CALIBRATION [03/2024 - ]
	Parking assist ECU initialization	Advanced Park	Refer to CALIBRATION [11/2021 - 03/2024] , or refer to CALIBRATION [03/2024 - ]
	Perform headlight ECU sub-assembly LH initialization	Lighting System (w/ Automatic Headlight Beam Level Control System)	Refer to INITIALIZATION [03/2022 - ]

*1: Even when not replacing the part, it is necessary to perform the specified necessary procedures after installation.

*2: Also necessary after performing a tire rotation.

*3: It is not necessary to perform this procedure if the tire pressure warning valve and transmitters are installed to the same location.

*4: If matchmarks were not placed when removing parts related to steering operation, perform automatic rack centering.

NOTE:

This procedure includes the removal of small-head bolts. Refer to Small-Head Bolts of Basic Repair Hint to identify the small-head bolts.
Refer to PRECAUTION [11/2021 - ]
To prevent the key from being locked in the vehicle, make sure to enter e-latch inspection mode and enable the manual release handle before disconnecting the cable from the negative (-) auxiliary battery terminal.
Refer to INSPECTION MODE PROCEDURE [11/2021 - ]

HINT:

When the cable is disconnected / reconnected to the auxiliary battery terminal, systems temporarily stop operating. However, each system has a function that completes learning the first time the system is used.

LEARNING COMPLETES WHEN VEHICLE IS DRIVEN

Effect/Inoperative Function when Necessary Procedure not Performed	Necessary Procedure	Link
Lighting System (EXT)	Drive the vehicle straight ahead at 35 km/h (22 mph) or more for 5 seconds or more.	Refer to INITIALIZATION [11/2021 - ]
Front Camera System
Adaptive High Beam System

LEARNING COMPLETES WHEN VEHICLE IS OPERATED NORMALLY

Effect/Inoperative Function when Necessary Procedure not Performed	Necessary Procedure	Link
E-latch System Back door opener	Perform door unlock operation with door control switch or electrical key transmitter sub-assembly switch.	Refer to INITIALIZATION [11/2021 - ]
Power Back Door System	Reset back door close position	Refer to INITIALIZATION [11/2021 - ]
Air Conditioning System	After the ignition switch is turned to ON, the servo motor standard position is recognized.	-

COMPONENTS (REMOVAL)

Fig 1: Cylinder Head Gasket Removal Components [03/2022 - ] (1 Of 9)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Callout - Procedure		Part Name Code
1	INSTALL ENGINE ASSEMBLY TO ENGINE STAND	-	See step 1	-	-
2	ENGINE HANGERS	-	-	-	-
3	COMPRESSOR WITH MOTOR ASSEMBLY	88370	See step 3	-	-
4	NO. 2 WATER BY-PASS PIPE SUB-ASSEMBLY	16207	-	-	-
5	FLOW SHUTTING VALVE (WATER BY-PASS HOSE ASSEMBLY)	16260	-	-	-
6	NO. 1 EXHAUST MANIFOLD HEAT INSULATOR	17167	See step 6	-	-
7	MANIFOLD STAY	17118	See step 7	-	-
8	EXHAUST MANIFOLD (TWC: Front Catalyst)	17141	See step 8	-	-
9	EXHAUST MANIFOLD TO HEAD GASKET	17173	-	-	-

*1	STUD BOLT	-	-
*a	Type A: x 3 Type B: x 5	-	-
•	Non-reusable part	-	-

Fig 2: Cylinder Head Gasket Removal Components [03/2022 - ] (2 Of 9)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Callout - Procedure		Part Name Code
10	NO. 5 WATER BY-PASS HOSE	16282F	-	-	-
11	THROTTLE BODY WITH MOTOR ASSEMBLY	22030	See step 11	-	-
12	NO. 6 WATER BY-PASS HOSE	16283	See step 12	-	-
13	THROTTLE BODY GASKET	22271	-	-	-
14	NO. 3 WATER BY-PASS HOSE	16267	-	-	-
15	NO. 4 WATER BY-PASS HOSE	16281	-	-	-
16	EGR COOLER ASSEMBLY	25680	-	-	-
17	EGR VALVE GASKET	25627	-	-	-
18	NO. 1 EGR COOLER GASKET	25685	-	-	-
19	NO. 1 EGR PIPE SUB-ASSEMBLY	25601	See step 19	-	-
20	EGR VALVE ADAPTER GASKET	25629	-	-	-
21	EGR INLET GASKET	25628	-	-	-
22	NO. 4 WATER BY-PASS HOSE	16281	-	-	-
23	NO. 8 WATER BY-PASS HOSE	16296	-	-	-
24	EGR VALVE ASSEMBLY	25620	See step 24	-	-
25	NO. 3 WATER BY-PASS PIPE	16279	See step 25	-	-
26	NO. 2 WATER BY-PASS PIPE	16278	See step 26	-	-
27	INTAKE MANIFOLD	17111	See step 27	-	-
28	NO. 1 INTAKE MANIFOLD TO HEAD GASKET	17177	-	-	-
29	FUEL PIPE CLAMP	23841K	-	-	-
30	FUEL TUBE SUB-ASSEMBLY	23910A	See step 30	-	-
31	NO. 1 FUEL PIPE SUB-ASSEMBLY	23801P	See step 31	-	-
32	FUEL (ENGINE ROOM SIDE) PUMP ASSEMBLY	23100X	See step 32	-	-
33	FUEL PUMP SPACER GASKET	23224D	-	-	-
34	FUEL PUMP LIFTER ASSEMBLY	23470	-	-	-

*A	w/ Stud Bolt	*B	w/o Stud Bolt
*C	for Type A	*D	for Type B
*1	FUEL PUMP FLANGE	-	-
•	Non-reusable part	-	-

Fig 3: Cylinder Head Gasket Removal Components [03/2022 - ] (3 Of 9)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Callout - Procedure		Part Name Code
35	NO. 7 WATER BY-PASS HOSE	16295	-	-	-
36	FUEL DELIVERY PIPE SUB-ASSEMBLY	23807	See step 36	-	-
37	NO. 1 DELIVERY PIPE SPACER	23807V	-	-	-
38	INJECTOR VIBRATION INSULATOR	23291	-	-	-
39	NO. 5 ENGINE WIRE	82125N	-	-	-
40	PORT FUEL INJECTOR ASSEMBLY	23250F	See step 40	-	-
41	WIRE HARNESS	-	-	-	-
42	FUEL DELIVERY PIPE	23814B	See step 42	-	-
43	DIRECT FUEL INJECTOR ASSEMBLY	23250E	See step 43	-	-
44	NOZZLE HOLDER CLAMP	23695A	-	-	-
45	NO. 3 FUEL INJECTOR BACK-UP RING	23258	See step 45	-	-
46	NO. 1 FUEL INJECTOR BACK-UP RING	23256	-	-	-
47	C-RING	-	-	-	-
48	INJECTOR VIBRATION INSULATOR	23291A	-	-	-
49	FUEL INJECTOR SEAL	23255A	See step 49	-	-

•

Non-reusable part

Fig 4: Cylinder Head Gasket Removal Components [03/2022 - ] (4 Of 9)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Callout - Procedure		Part Name Code
50	IGNITION COIL ASSEMBLY	19500	See step 50	-	-
51	ENGINE OIL LEVEL DIPSTICK GUIDE	11452	See step 51	-	-

*1	ENGINE OIL LEVEL DIPSTICK	-	-
•	Non-reusable part	-	-

Fig 5: Cylinder Head Gasket Removal Components [03/2022 - ] (5 Of 9)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Callout - Procedure		Part Name Code
52	OIL PRESSURE CONTROL VALVE ASSEMBLY	15250	See step 52	-	-
53	CAM TIMING OIL CONTROL SOLENOID ASSEMBLY	15370	See step 53	-	-
54	CAM TIMING OIL CONTROL SOLENOID O-RING	15370A	See step 54	-	-
55	CAM TIMING CONTROL MOTOR WITH EDU ASSEMBLY	13090D	See step 55	-	-
56	CAM TIMING CONTROL MOTOR O-RING	13090E	-	-	-

•

Non-reusable part

Precoated part

Fig 6: Cylinder Head Gasket Removal Components [03/2022 - ] (6 Of 9)

Callout - Procedure		Part Name Code
57	NO. 1 WATER BY-PASS HOSE	16261Z	-	-	-
58	NO. 2 WATER BY-PASS HOSE	16264D	-	-	-

Fig 7: Cylinder Head Gasket Removal Components [03/2022 - ] (7 Of 9)

Callout - Procedure		Part Name Code
59	CRANKSHAFT PULLEY ASSEMBLY	13470	See step 59	-	-
60	WATER OUTLET	16331	See step 60	-	-
61	WATER OUTLET GASKET	16341	-	-	-
62	WATER BY-PASS OUTLET	16351	See step 62	-	-
63	WATER OUTLET PIPE GASKET	16345	-	-	-
64	CAMSHAFT POSITION SENSOR (for Intake Side)	11102A	See step 64	-	-
65	CAMSHAFT POSITION SENSOR (for Exhaust Side)	11102A	See step 65	-	-
66	CYLINDER HEAD COVER SUB-ASSEMBLY	11201	See step 66	-	-
67	SPARK PLUG TUBE GASKET	11193	See step 67	-	-
68	ENGINE MOUNTING BRACKET RH	12315A	See step 68	-	-
69	NO. 2 TIMING CHAIN COVER ASSEMBLY	11320B	See step 69	-	-
70	TIMING CHAIN COVER OIL SEAL	11301C	See step 70	-	-
71	SET NO. 1 CYLINDER TO TDC (COMPRESSION)	-	See step 71	-	-

*1	CRANKSHAFT PULLEY BOLT	-	-
•	Non-reusable part	*	Precoated part

Fig 8: Cylinder Head Gasket Removal Components [03/2022 - ] (8 Of 9)

Callout - Procedure		Part Name Code
72	OIL PUMP DRIVE CHAIN SUB-ASSEMBLY	13507A	See step 72	-	-
73	CAMSHAFT TIMING GEAR ASSEMBLY	13050	See step 73	-	-
74	CHAIN SUB-ASSEMBLY	13506	-	-	-
75	NO. 1 CHAIN TENSIONER ASSEMBLY	13540	See step 75	-	-
76	CHAIN TENSIONER SLIPPER	13559	-	-	-
77	NO. 1 CHAIN VIBRATION DAMPER	13561	-	-	-
78	CAMSHAFT TIMING EXHAUST GEAR ASSEMBLY	13070A	See step 78	-	-
79	TIMING CHAIN COVER ASSEMBLY	11310	See step 79	-	-

*A	Type A	*B	Type B
*1	CHAIN TENSIONER PLATE	*2	CHAIN DAMPER SPRING
*3	OIL PUMP DRIVE SPROCKET	*4	OIL PUMP DRIVE SHAFT SPROCKET
*5	CRANKSHAFT TIMING SPROCKET	*6	CAMSHAFT TIMING VALVE ASSEMBLY

Fig 9: Cylinder Head Gasket Removal Components [03/2022 - ] (9 Of 9)

Callout - Procedure		Part Name Code
80	FUEL PUMP LIFTER GUIDE	23477	See step 80	-	-
81	CAMSHAFT HOUSING SUB-ASSEMBLY	11103	See step 81	-	-
82	CAMSHAFT BEARING CAP	-	See step 82	-	-
83	CAMSHAFT	13511	-	-	-
84	NO. 2 CAMSHAFT	13512	-	-	-
85	NO. 1 VALVE ROCKER ARM SUB-ASSEMBLY	13801	-	-	-
86	VALVE LASH ADJUSTER ASSEMBLY	13750	-	-	-
87	VALVE STEM CAP	13716	-	-	-
88	CYLINDER HEAD SUB-ASSEMBLY	11101	See step 88	-	-
89	CYLINDER HEAD GASKET	11115	-	-	-
90	INSPECT CYLINDER HEAD SET BOLT	11101A	See step 90	-	-
91	INSPECT CYLINDER HEAD SUB-ASSEMBLY	11101	See step 91	-	-

*1	CYLINDER HEAD SET BOLT	*2	PLATE WASHER
*3	NO. 1 CAMSHAFT BEARING CAP	*4	NO. 2 CAMSHAFT BEARING CAP
*5	NO. 3 CAMSHAFT BEARING CAP	*6	NO. 4 CAMSHAFT BEARING CAP
•	Non-reusable part	-	-