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 LC 500hFACTORY OEM SERVICE PROCEDURE

Spark Plug

SPARK PLUG

Standard Insulation Resistance	Spark plug (terminal part) - Body ground	10 MΩ or higher
Spark Plug Type	DENSO made	FK20HBR8
Maximum Electrode Gap	For Used Spark Plug	1.1 mm (0.0433 in.)
Standard Electrode Gap	For New Spark Plug	0.7 to 0.8 mm (0.0276 to 0.0315 in.)

Factory Service Tools

Use the Manual With the Right Hardware

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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.

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