How do you replace the passenger side upstream 02 sensor from under this vehicle?

2000 Ford Explorer 5.0 V8

I have had my (4) 02 sensors replaced about 3-4 yrs ago and I stood beside the vehicle while the mechanic replaced them 1 by 1. He handed me the old one and I handed him the new one. After he was done the vehicle threw a CEL. The problem was the mechanic didn't fasten one of the connectors all the way. My question is how did he do it from under the vehicle? It is an extremely tight space under there. Most people are saying they went inside the vehicle and under the console to unhook the 02 sensor and hook it back up. Well, this mechanic didn't. He did everything from under. He also didn't take anything apart or go inside my vehicle. So obviously this mechanic knew a secret route or something. It didn't take him very long to replace them either. Maybe it will just take a while to get your hand to where you can unhook and hook it back up from under or something. Not sure. Any ideas? My guy said there was no way he could get to it from under the vehicle because of the tight space between everything. But I know you can!

Car makes a creaking noise while driving, what could be the issue?

I have a 2009 Ford Explorer that when I'm driving it makes a creaking noise-the kind of noise if you heard a door or something like that making a similar sound you'd just spray some WD-40 and be good to go. I know the brakes are a possible issue, but the creaking sound is more when I'm actually driving and not braking.

Any guesses?

What's the best car to buy?

What brand/ model/year won't give me a hard time (I'm sooo over ford explorers pure nightmares) . What do yall recommend?

What's wrong with my SUV?

My Ford Explorer is 2003. It has a new battery and starts up great. However once in a while just dies. I have had it checked and alternater is good and no codes came up. Can anyone tell me what it could be. I depend on this vehicle for work and my kids.

Same cop keeps pulling me over, what should I do?

5am one morning I was going to work and a cop went behind me and turned his flashers on and I pulled over and stopped. He got onto me over turning my high brights on and supposedly 'bright spotting' him. I told him it was dark and he said 'It ain't that dark'

He let me off with a warning and told me to get my vision checked. He was really aggressive and grumpy. This cop was a sheriff and had a cop car that looked like a Ford explorer.

The other day I was driving and he magically appeared behind me and tailgated me for a while and then he turned his flashers on.

I pulled over and rolled down my Windows and he said 'I pulled you over before' and I said 'yes' and he ask me 'why do you keep speeding up and then breaking?'

I told him I'm trying to maintain the speed limit of 45 and don't want to go over it. He told me the speed limit is 55 up until you get to that point over here and he pointed his fingers to this area of road over there.

I asked him if he needed to see my credentials and he didn't ask or want them and he walked back to his sheriff car and I drove off. He went then about his business. I was nervous this time.

What should I do?

I drive a toyota Corolla 2015 sedan. My car doesn't look suspicious and is pretty new and I do have a cb radio installed with a antenna on top.