Code PO138, 02 sensor

2000 SATURN SL1
200,000 MILES • 1.9L • 4 CYL • MANUAL
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WILLIAMDAISE
  • MEMBER
  • 25 POSTS
have bank 1 sensor 2 behind the cat po-code 138 high voltage. when car is at normal temperature reads 415 to 420 v, is that normal? also steady some times it mimic's the front one. it's an eBay sensor so is the front one. Google it said to change the sensor.
Oct 19, 2020 at 3:11 AM
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DANNY L
  • ✓Experienced Mechanic
  • 5,648 POSTS
Hello, I'm Danny.

I've attached some diagnostic code steps below for code P0138. Here is a tutorial showing how to replace an o2 sensor:

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

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

Hope this helps and thanks for using 2CarPros.


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Oct 19, 2020 at 7:08 AM
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