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.

2011 Lexus IS 350 Base, AWDFACTORY OEM SERVICE PROCEDURE

Service Data

Spark plug	Recommended spark plug	DENSO made: FK20HBR11
	Correct electrode gap for new spark plug	1.0 to 1.1 mm (0.0393 to 0.0433 in.)
	Maximum electrode gap for used spark plug	1.4 mm (0.0551 in.)
	Insulation resistance	10 MΩ or more

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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.