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Code PO155, Oxygen sensor location needed

Tiny
DEQUESO
  • MEMBER
  • 2003 CHEVROLET ASTRO
  • 4.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 78,000 MILES
Scanner read out PO155 02 heater circuit (bank 2, sensor 1). Can you let me know where that is located and is there only 1? 1 bad rest good?
Friday, July 2nd, 2021 AT 12:31 PM

12 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Hello again.

The sensor is on the passenger side of the motor just down from the exhaust manifold. It is before the cat converter.

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

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

I attached the flow chart for the code. Most of the time, it is the sensor that is bad but you need to verify it by following the flow chart.

Roy
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Friday, July 2nd, 2021 AT 2:15 PM
Tiny
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Can I remove the sensor drive to buy new sensor to compare that it is the same long trip to parts store? Also what kind of scanner do I need to check flow? I am a novice to the new cars. Great info great web.
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Saturday, July 3rd, 2021 AT 5:29 AM
Tiny
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  • MECHANIC
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Yes, you could but not recommended. You could loosen it and make it easy to remove when you get to the parts store.

There is only one sensor for sensor 2 bank 1. Do not get a universal sensor. They are not qualified and may not even work out of the box. Get a name-brand sensor.

Roy
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Saturday, July 3rd, 2021 AT 6:16 AM
Tiny
DEQUESO
  • MEMBER
  • 38 POSTS
Good idea good info again. It will be a while before I get 2 it. Thank you and have a good 4th. One little thing AutoZone gave me a bosch #15898 exact fit. That should be the right one not universal?
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Saturday, July 3rd, 2021 AT 8:19 AM
Tiny
ASEMASTER6371
  • MECHANIC
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That is correct.

You are welcome.

Always glad to help.
.
Roy
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Saturday, July 3rd, 2021 AT 9:54 AM
Tiny
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  • MEMBER
  • 38 POSTS
Prior to replacing oxygen sensor 02 disconnected battery put jumper from positive 2 negative set 10 minutes replaced sensor. Does the check engine light stay on if so about how long?
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Tuesday, July 13th, 2021 AT 8:12 AM
Tiny
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Why are you doing that? That does absolutely nothing at all.

Roy
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Tuesday, July 13th, 2021 AT 1:59 PM
Tiny
DEQUESO
  • MEMBER
  • 38 POSTS
Thought that was the way to get check engine light off after replacing bank 2 sensor.
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Tuesday, July 13th, 2021 AT 2:13 PM
Tiny
ASEMASTER6371
  • MECHANIC
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No. I do not know who told you that but it is not the way.

You could remove the negative battery cable for about 10 seconds or you can use a scan tool to clear the code.

Roy
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Tuesday, July 13th, 2021 AT 2:40 PM
Tiny
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I will give that a try. Thank you
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Tuesday, July 13th, 2021 AT 2:45 PM
Tiny
ASEMASTER6371
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You are welcome.

Always glad to help.

Roy
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Tuesday, July 13th, 2021 AT 2:51 PM
Tiny
DEQUESO
  • MEMBER
  • 38 POSTS
  • 2003 CHEVROLET ASTRO
  • 3.4L
  • 6 CYL
  • 4WD
  • 79,000 MILES
Does the sensor spray that they have really work also are all the sensors on bank 1 and bank 2 from and rear the same?
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Saturday, October 9th, 2021 AT 6:29 PM (Merged)

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