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The diagnostic port is rectangular. They are to feel initially tight because of the seals. They only fit one way but often you feel taking off the cover it wont come apart. You have to lift the tab and when replacing push it hard to click. Unless you remove the tank this is your best option. It's a lot of faff but it's an hours work off and on to be fair just to attach 2 cables. If your under there check air filter too .
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