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O2 Sensor High Voltage (Bank 1 Sensor 2)

Tiny
AARONACURA
  • MEMBER
  • 1997 ACURA CL
  • 111,111 MILES
Hello,

My car is throwing a P0138 O2 Sensor High Voltage (Bank 1 Sensor 2) CEL error code.

-Is "Sensor 2" the down-stream (post catalytic converter) oxygen sensor?
-Where is "Sensor 2" located?
-Would replacing the down-stream oxygen sensor fix this problem and get rid of the CEL?

I need to pass a emissions test and smog check ASAP. Any advice is greatly appreciated!

Thanks in advance,
Aaron
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Saturday, October 22nd, 2011 AT 7:33 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

The sensor 2 is the oxygen sensor located after the catalytic converter.
I have attached a picture below showing the location of the sensor 2.

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

The code P0138 can be due to a bad oxygen sensor. But it can also be due to a fault in the oxygen sensor circuit.

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

I have attached a trouble shooting flow chart below for the code P0138.
Follow those steps and it can help you determine the issue.

Please let me know if you have any questions.
Thank you.
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Sunday, January 23rd, 2022 AT 11:03 PM

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