Very unlikely it will clog. Rarely see it.

its due to a poor design of the engine block by ford. The TSB has you replace the long block and head gasket. It will happen again if you only replace the gasket.

Wide band will usually label 02 voltage as LAMBDA and are not used as downstream sensors. They work opposite of narrow. High voltage means lean low means rich. 1v would be ideal A/F ratios and anything above or below would be as I described. Pull a vacuum line while watching voltage to see if the 02 reacts or not. Down stream 02 should be a steady 750-800mv.

I don’t think you will get an answer on here. You need a scan tool and somebody that can interpret the data that it will show you.

What engine size

1. Wrench on inner, Wrench on nut
2. Impact Wrench with a socket
3. Acetylene torch heat then Impact Wrench
4. Cut it and replace inner

Intermittent suck. Take it to someone reliable and they will just have to keep it until the problem happens again.

There is no easy way. Pretty sure that’s part of the entire dash.

It’ll be fine. May under perform a bit but won’t cause any other damage.

Eat the loss and take it to someone who can actually fix it.