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Just had three codes come up on my sudden check engine light: P1009, P2646 and P0420.

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Just had three codes come up on my sudden check engine light: P1009, P2646 and P0420. Does this mean that suddenly there are 3 different problems that occurred at the same time? Or is only one of them causing the engine light?

Vehicle: 2004 Honda Accord EX-L, 4Cyl

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