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What Causes the Three-Way Catalytic Converter Warning Light to Illuminate?

1 Answers

MacVivian

07/30/25 5:43am

The frequent illumination of the three-way catalytic converter engine warning light can typically be resolved by cleaning the converter. Here's the cleaning method: 1. Start the engine and let it run until the coolant reaches normal operating temperature, then turn off the engine. 2. Pour the cleaning solution into a specialized cleaning device and connect the device's output to the vacuum line. 3. Restart the engine, open the flow control valve, and slowly drip the cleaning solution into the intake manifold. 4. After cleaning, keep the engine running for 3 to 5 minutes. Below is some relevant information about three-way catalytic converters: The three-way catalytic converter is an external emission control device installed in a vehicle's exhaust system. It converts harmful exhaust gases such as carbon monoxide, hydrocarbons, and nitrogen oxides into harmless carbon dioxide, water, and nitrogen through oxidation and reduction reactions.

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