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.
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HOMESERVICE MANUALSTOYOTA2002HIGHLANDER 4WD L4-2.4L (2AZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSRECALLSCAMPAIGN - ECM UPDATE FOR MIL ON/DTC P0420/P0430IV. BACKGROUND
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)
IV. Background
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)SECTION IV. Background
In recent months, Toyota has received reports that some customers may experience a Malfunction Indicator Light (check engine light) "ON" condition (P0420 or P0430). Toyota has investigated these concerns and discovered an issue with the program logic in the Engine Control Module (ECM). New program logic has been developed to correct this condition.
RENDER: 1.0x
NO RELATED
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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.