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General Ford Flex Discussions • New O2s

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Time to replace both upstream O2s on my 2011. Looking at rock auto, there must have been a change in plugs right around my build date. Build date 12 13 10.
Motorcraft or Bosch? Both look like they are more expensive due to the build date, which is listed as before 12 23 10 for MC, Bosch up to 12 10. Guessing I have the older version….
Any advice?

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