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Old 12-21-2008, 09:59 PM   #1
wishpony13
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What is the Bank 1 and Bank 2 on 1998 Tahoe 4WD


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My husband is working on our 1998 Chevy Tahoe and he has a diagnostic tool and refers to Bank 1 and Bank 2 in reference to the oxygen sensors. Where is bank 1 and bank 2 located at?
And also what kind of tool is needed in order to change fluids in the transfer case? Evidently previous people who worked on it stripped one of the filler plugs and my husband thinks it's a metric tool but not sure which one.

Thanks for your assistance.
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Old 12-22-2008, 12:01 AM   #2
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Bank 1 is the drivers side and 2 is passenger sensor 1 is before cat and 2 is after
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Old 12-22-2008, 12:19 AM   #3
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Thanks so much...now can you answer this. My husband can only find two oxygen sensors one in front of the cat and one facing the vehicle on the front on right side of the block single wire. Someone told him there were four oxygen sensors. If there is, where are the other two?
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Old 12-22-2008, 12:31 AM   #4
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Ok, the first sensors for bank one and two are right after the joint on the manifolds right up by the firewall. The second set of sensors are behind the cats, one is before the two pipe connection and the other is right behind it.


The number one sensors for both banks is the one that controls the fuel map. The number two sensors are just check sensors to make sure the cats are working. They don't control a thing. They just make life miserable by turning on the check eng. light when the cats start getting a little lazy to light off. Espically when it gets colder out.

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Old 12-22-2008, 12:54 AM   #5
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Thank you so much for your help. I will keep coming back when he has more questions. I have bought him so many books on this vehicle and sometimes they just don't make a bit of sense...not even to me. Thanks again!!!:thumbsup:
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Old 12-22-2008, 12:55 AM   #6
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tell ur hubby not to be shy jump on here and post some pics of that hoe
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Old 12-22-2008, 12:59 AM   #7
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I will definitely post some pics of his hoe when I can take some. He's still learning about the computer so I am doing the posting while he watches.
He also wanted to know about transfer case filler plugs and drain plugs as to what type of tool to use to get them off. Standard and metric doesn't fit and someone else previously it looks like they stripped the filler plug. So he needs advice on how to get those off so he can drain and fill the transfer case.
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Old 12-22-2008, 01:40 AM   #8
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Fill and drain plugs, try to get on them with the best fitting 6 point socket you got. If that don't work vise-grip them off and replace them. I'm dealing with idiot previous owner stuff myself.
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Old 12-22-2008, 02:07 AM   #9
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He says a socket won't work because there is nothing to grab a hold of. The tool that takes it off fits inside the plug which is four sided square. He tried a quarter inch rachet which is too small and three eighths which is too large. So any ideas on that????? The plugs are flush with the transfer case. So he can't grab onto anything.
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Old 12-22-2008, 02:36 AM   #10
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OK they're that style. They should come out with a 3/8 drive. Chip and scrape the corrosion and junk out of the hole until it fits. Not unless the hole is round then they have these little things that are called easy-outs. They have a back wards spiral on them as wall as a taper. The more you turn them the harder they bite as they draw into the hole. You may have to grind one down to get the right size at the tip to start properly.
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