Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2021 Lexus NX 300h BaseFACTORY OEM SERVICE PROCEDURE

Removal [10/2014 - ]: Procedure

DISCONNECT WIRE HARNESS
Refer to PROCEDURE - Step 4 [10/2014 - 09/2016], or refer to PROCEDURE - Step 4 [09/2016 - ]
REMOVE NO. 1 EXHAUST MANIFOLD HEAT INSULATOR
Refer to PROCEDURE - Step 4
DISCONNECT INVERTER RESERVE TANK ASSEMBLY
Refer to PROCEDURE - Step 7 [10/2014 - 09/2016], or refer to PROCEDURE - Step 7 [09/2016 - ]

REMOVE AIR FUEL RATIO SENSOR

Remove the radiator hose clamp as shown in the illustration.

GTY521058

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Push

Disconnect the air fuel ratio sensor connector.

Using SST, remove the air fuel ratio sensor from the exhaust manifold.

SST: 09224-00011

GTY502803

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.