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Confirmation Driving Pattern

Switch hand-held tester from normal mode to check mode. Start engine and let engine idle for 100 seconds or more. Drive vehicle at 24 mph or more for 20 seconds for more. Let engine idle for 20 seconds or more. Repeat procedure 3 times. Let engine idle for 30 seconds. Check oxygen sensor output voltage. If a malfunction exists, CHECK ENGINE warning light should come on.

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