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socket issue

  1. Mazda 6 2011 spark plug replace issue

    Engine & Transmission
    Hi Guys, I have a Mazda 6 2011 model, I wanted to replace spark plugs but I have got a problem with the 4th cylinder others (1-3) have no problem. As I attached pics it looks like the 4th plug socket size is completely different. Anyone has seen it before or any idea how to remove it. Thank you.
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