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A blinking check engine light on a 2000 Toyota Sienna typically indicates a serious issue, such as a misfire, that can damage the catalytic converter if not addressed promptly. It's important to stop driving the vehicle and diagnose the problem as soon as possible. You can use an OBD-II scanner to retrieve diagnostic trouble codes, or take the vehicle to a mechanic for a thorough inspection. Ignoring this warning could lead to more costly repairs down the line.
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I believe it is blinking because there is a misfire inside the engine. Meaning that the timing is off. This could be because the timing belt may be old and the teeth are chewed and are not as rigid. That was the case for my 96 tacoma.
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In the manual for my car it says a blinking, yellow check engine light means the catalytic converter is malfunctioning.
