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Where is the bank2 sensor located and how to replace it?

Tiny
RYDER1477
  • MEMBER
  • 2004 CHEVROLET IMPALA
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 220,000 MILES
I only need the male end. I did a motor swap between 2, 2004 Impala LS. One that was wrecked but had a newer motor with only 101,000 kms on it. So, I swapped them out and somehow when taking the older motor out, the line was cut for the bank2 sensor. I have from just before the catalytic converter, the sensor but without the male end connector. Can't find it anywhere and the closest store says it will be 3-4 weeks to get it.
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Sunday, November 10th, 2024 AT 8:55 AM

25 Replies

Tiny
AL514
  • MECHANIC
  • 4,793 POSTS
Hello, so you do not have both ends that were cut still. Meaning you can't use crimp connectors to repair the 4 wires that run to the bank 2 oxygen sensor? Or you're saying that the connector on the sensor side of the harness was lost somehow. I assume by you're mentioning km, you are not in the US, where are you located?
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Sunday, November 10th, 2024 AT 12:18 PM
Tiny
RYDER1477
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I'm in Canada. And no, somehow the male end connector is nowhere to be found. The sensor w/female end is still there. Trying to locate any distributors that carry and/or have the O2 sensor connector available is next to impossible, nobody has it.
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Sunday, November 10th, 2024 AT 1:35 PM
Tiny
AL514
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Yeah, trying to find the connector itself will be very difficult, the best thing to do is just to get a new oxygen sensor altogether.

I'm looking at the wiring diagrams right now, and it showing only 1 upstream oxygen sensor and 1 downstream after the cat, even though this is a V6, is that correct? Or do you have a sensor upstream of the Cat in both banks of the engine?
Service info is showing only one upstream 02 for both VIN #s.

And is the 8th digit of your VIN # a "1" or a "K"?
I don't want to get your hopes up, but Ill take a look and see if I can find you one.
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Sunday, November 10th, 2024 AT 2:40 PM
Tiny
AL514
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This is what its showing, just one upstream and one downstream 02 sensors.
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Sunday, November 10th, 2024 AT 2:42 PM
Tiny
AL514
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Can you send me a picture of the harness connector for the sensor you need. I actually might have your sensor here right now, a friend who was retiring actually gave 150 oxygen sensors that are all from the late 90s up to 2004-5 range, I'll take a picture of the connector on these sensors and let me know if it looks correct.
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Sunday, November 10th, 2024 AT 3:04 PM
Tiny
AL514
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These are supposed to be for a 04 Chevy Impala 3.8L VIN both 1 and K. I have a bag full of them.
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Sunday, November 10th, 2024 AT 3:11 PM
Tiny
RYDER1477
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  • 19 POSTS
Yes! That is the connector I need! Nobody in western Canada has one and ordered it wouldn't be here until Dec.4.
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Sunday, November 10th, 2024 AT 3:49 PM
Tiny
RYDER1477
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And 8th digit/letter of my VIN is a K.
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Sunday, November 10th, 2024 AT 3:51 PM
Tiny
RYDER1477
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  • 19 POSTS
And I haver a 04 chevy impala LS 3.8L.
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Sunday, November 10th, 2024 AT 3:52 PM
Tiny
RYDER1477
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  • 19 POSTS
Actually they sell just the connector up here but everyone here is outta stock or its not available to order
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Sunday, November 10th, 2024 AT 3:55 PM
Tiny
RYDER1477
  • MEMBER
  • 19 POSTS
Actually that's not what I need that's the female end in your images I need the male end 4 PIN connector like in my image above.
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Sunday, November 10th, 2024 AT 3:56 PM
Tiny
AL514
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Okay, it looks like the upstream 02 sensors have a female connector and the downstream (after the Cat) have a male connector as in the pictures above.
This is the upstream (pre-Cat) S1 oxygen sensor connector, it is a female connector.
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Sunday, November 10th, 2024 AT 4:21 PM
Tiny
AL514
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Refresh this page, I posted new pictures.
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Sunday, November 10th, 2024 AT 4:22 PM
Tiny
RYDER1477
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Yup that's it.4 PIN w/slot on 1 side not 2.
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Sunday, November 10th, 2024 AT 4:53 PM
Tiny
RYDER1477
  • MEMBER
  • 19 POSTS
Why do you say it's misleading in the first image? It looks exact to me.
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Sunday, November 10th, 2024 AT 4:55 PM
Tiny
AL514
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This one actually has the pins marked on it, B and D and C and A, that pinout is correct according to service info, Send me an email address and I'll contact you on the side, I'll mail these both up to you tomorrow. I'm not sure how long it will take, I can't imagine it will take more than a few days.
Do you want the Sensor 2 as well? I have no need for all these sensors, I was just going to give them away, so it makes no difference to me if you want both.
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Sunday, November 10th, 2024 AT 4:58 PM
Tiny
AL514
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I just meant in service information they show the harness side of the connectors not the sensor side, and S1 and S2 are both opposite. They just have them listed weird. But service info is sometimes incorrect. This looks all good though.
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Sunday, November 10th, 2024 AT 5:01 PM
Tiny
RYDER1477
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Oh man! That would be great Thank you! Connect with me here:
ryder1477@pm. Me
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Sunday, November 10th, 2024 AT 5:22 PM
Tiny
AL514
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Heres the replacement info for sensor 1, they can be difficult to get out sometimes, try some heat if it feels like it's going to strip the threads out of the exhaust manifold.

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor
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Sunday, November 10th, 2024 AT 5:23 PM
Tiny
AL514
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I'll email you right now.
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Sunday, November 10th, 2024 AT 5:25 PM

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