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Where is sensor 2 bank 1 located?

Tiny
JAYDOG83
  • MEMBER
  • 2018 CHEVROLET MALIBU
  • 1.5L
  • 4 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 58,000 MILES
I'm looking for a sensor 2 bank 1. It's giving me a code for delayed response rich too lean on ho2s 2 bank 1.
Friday, June 25th, 2021 AT 6:00 PM

7 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

I attached a picture with the location of the sensor for you.

Do you have a code set for this? If you do, can you please post it so I can help narrow the area of failure for you?

Most of the time, it is not the sensor at all. It is something else causing the sensor to read incorrectly.

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

I would check the fuel pressure as low fuel pressure will cause lean running conditions. Very common issue.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Roy
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Saturday, June 26th, 2021 AT 5:05 AM
Tiny
JAYDOG83
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Now I did see black soot coming from a flange that comes from the intake. And also noticed that something was hit and knocked the whole exhaust system back a little. Just enough to maybe break that seal?
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Saturday, June 26th, 2021 AT 6:28 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Thank you. If you have an exhaust leak, and it looks like you do, then it would explain the O2 sensor code. Not only is it leaking exhaust, but it is also pulling in the air into the system.

You need to repair the leak. Once it is repaired, clear the code and see if it returns. Watch the voltage changes when it is running.

https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor

https://www.2carpros.com/articles/how-an-oxygen-sensor-works

Roy
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+1
Saturday, June 26th, 2021 AT 6:34 AM
Tiny
JAYDOG83
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Thanks a lot. I'll definitely try to fix the leak, instead of changing the sensor first, and hopefully that's it. I didn't know what sensor was 1 or 2, actually my first ever O2 sensor run in.
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Saturday, June 26th, 2021 AT 6:50 AM
Tiny
ASEMASTER6371
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You are welcome.

Always glad to help.

Keep us updated.

Roy
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Sunday, June 27th, 2021 AT 9:57 PM
Tiny
JAYDOG83
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Fixed the exhaust leak, cleared the code, and it's running better. Now I tried tightening the flange but it's not sealing completely. I used a flange sealant from work that we use on somewhat high pressure flanges/high temperature applications and it seems to be holding so far. But if the code comes back I know it would be or where it would be.
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Monday, June 28th, 2021 AT 10:55 AM
Tiny
ASEMASTER6371
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Correct.

Good job.

Roy
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Monday, June 28th, 2021 AT 11:46 AM

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