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If the check engine light is on in your 2002 Toyota SR5, it indicates that the vehicle's onboard diagnostics system has detected an issue. Common causes can include problems with the oxygen sensor, catalytic converter, spark plugs, or fuel system. It's advisable to use an OBD-II scanner to retrieve the trouble codes, which can help pinpoint the issue. If you're unsure, consider taking the vehicle to a mechanic for a thorough inspection and repair.

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