Correct answer
Reach the operating temperature specified for its design.
Reach its operating temperature. Warm-up efficiency depends on design and conditions; no universal 250 °C threshold or fixed three-to-five-minute warm-up applies to every catalyst. Follow manufacturer instructions and do not use this explanation to justify unnecessary idling.
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Cool as far as possible because it only works cold.
Always wait exactly five minutes, regardless of design.
Reach the operating temperature specified for its design.
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