Does anyone have a picture of where both o2 sensors are? - Page 2 - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
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Old 06-05-2019, 03:23 AM   #11
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Originally Posted by acsmith1972 View Post
Pretend for a minute that everything I know about cars is from Youtube or what someone showed me in person and that I have no idea what I'm looking at in the picture.
That is the exhaust manifold. By my foot in the picture is the downstream sensor and the hole is where the upstream would be.

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Old 06-05-2019, 11:31 AM   #12
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That is the exhaust manifold. By my foot in the picture is the downstream sensor and the hole is where the upstream would be.

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So that's the one that's on the bottom that you can't see from under the hood?
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Old 06-05-2019, 01:19 PM   #13
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Yep

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Old 06-06-2019, 01:49 PM   #14
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Yep

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Cool, I'll check it out to at least see if I can see that in a little bit.
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Old 06-07-2019, 09:49 PM   #15
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Here's a pic to help.

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Hey just wanted to ask how easy it to remove the factory header from the focus?
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Old 06-08-2019, 11:32 AM   #16
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Hey just wanted to ask how easy it to remove the factory header from the focus?
It wasn't hard but still a pain. 2 people make it much easier. Have to remove both engine mounts (didn't have to touch the trans mount) drop the engine a couple inches and pull it forward a little. Then with a bit of wiggling come out the top pretty easy with one person on each end.

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Old 06-09-2019, 09:19 AM   #17
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Originally Posted by acsmith1972 View Post
Pretend for a minute that everything I know about cars is from Youtube or what someone showed me in person and that I have no idea what I'm looking at in the picture.
If thats the case, Why not have a shop do it?
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Old 06-09-2019, 01:15 PM   #18
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If thats the case, Why not have a shop do it?
Gotta learn somehow

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Old 06-10-2019, 04:49 AM   #19
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Originally Posted by felixthecat View Post
If thats the case, Why not have a shop do it?
So this is what, th condescending blog for people who already know how to do everything to pat each other on the back? You go on blogs to learn.

For example, from Youtube, I have learned how to do the transmission flush and filter change, I already knew oil, I learned how to do my differential and transfer case fluid changes (2009 Toyota Rav4 V6). I learned how to do a coolant flush. I know how to change the calipers, bleed the brakes, and, obviously from that point change the discs and pads. I can do the o2 sensors in my Rav4 because the ones I've had to work on so far weren't in stupid places. I can change the spark plugs and coil packs, clean and even change the MAF, change the PCV, clean the intake manifold, do literally everything electric with the car from wiring anything to radios, headlights, etc. I can change the cabin and engine air filters. I can replace the ac blower motor. I can replace the master cylinder. I can do the purge valve. I can do the chains and belts depending what the car has, but prefer not to, it's a huge pain in the ass. I can do the entire suspension.

Things I cannot do are things I have no clue where they are. There aren't a lot of good pictures or diagrams on the MK3 Focus. It seems to be everyone's least favorite car unless it's an ST or RS and even those are lacking in pictures and the like. I also couldn't do the brakes on my Focus because of the 8mm hex thing on the caliper that would not come off no matter what I tried, so I said screw it and brought the parts to a local shop and had them do it. I can't jack the car in any meaningful way because the people who designed it are idiots and put a plastic trim along the side blocking most of the good spots. I still have no clue how one would jack up the entire front of the car, none of my jacks will reach any jack points that might be in front in the center. If I had to replace the front bumper for whatever reason I wouldn't be able to, I tried taking it off once and had no tools that would reach the two bolts on either side of it that are recessed up inside behind that wheel cover. Most of the easy stuff on my Rav4 I cannot do on the Focus because it's a really bad design. My WRX was way easier to work on.

I can't even figure out how to change the high beam bulbs to aftermarket LEDs because they went with H1 and the clip holds the bulb in and has no room for the aftermarket parts. The H11 low beams were easy to do. I rather like the headlight assembly design and tail light. Very easy to get out. My Rav4 you have to take the front bumper off to do the assembly. Dumbest design ever.
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Old 06-10-2019, 09:19 AM   #20
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Quote:
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I know where the upper one is that you can see when you pop the hood. I know there's one underneath somewhere, but have no clue where it is.
Get the car up on a rack or get the frontend up on jackstands & get underneath it & follow the exhaust manifold/converter back to the flex. You'll find the upstream before the convertor & the downstream after......The o2 sensors read the exhaust content, whether rich/lean, ect. I'm not here to pat ppl on the back as you mentioned. Just basic common sense/logic or you could be that guy that goes into a auto parts store & says I need such & such part for that car over there in the parking lot & has no clue what he's driving, some ppl I find its best to have a shop do it & for others to have buddies, ect help them or show how. Your always going to find some parts on different vehicles takes time to do & then think, what were the engineers thinking, such as a starter on a Northstar or a Lexus LS or a water pump on a 3.5 Ford in a flex/taurus/fusion. Look at the so called lifetime filter on the earlier foci's, I find its easier to remove the front bumper cover off to remove it & all the ducting.
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