![I ran a computor check on a 04 grand cherokee and came up with the code P0155, oxygen sensor heater circuit malfunction. I ran a computor check on a 04 grand cherokee and came up with the code P0155, oxygen sensor heater circuit malfunction.](https://www.justanswer.com/uploads/ebrock63/2008-01-12_192711_o2.png)
I ran a computor check on a 04 grand cherokee and came up with the code P0155, oxygen sensor heater circuit malfunction.
![P0155 Code: Oxygen Sensor Heater Circuit Malfunction (Bank 2, Sensor 1) - In The Garage with CarParts.com P0155 Code: Oxygen Sensor Heater Circuit Malfunction (Bank 2, Sensor 1) - In The Garage with CarParts.com](https://www.carparts.com/blog/wp-content/webp-express/webp-images/doc-root/wp-content/uploads/2020/04/oxygen-sensor.jpeg.webp)
P0155 Code: Oxygen Sensor Heater Circuit Malfunction (Bank 2, Sensor 1) - In The Garage with CarParts.com
![P0155 Code: Oxygen Sensor Heater Circuit Malfunction (Bank 2, Sensor 1) - In The Garage with CarParts.com P0155 Code: Oxygen Sensor Heater Circuit Malfunction (Bank 2, Sensor 1) - In The Garage with CarParts.com](https://www.carparts.com/blog/wp-content/uploads/2021/10/automotive-egr-system-1024x683.jpg)
P0155 Code: Oxygen Sensor Heater Circuit Malfunction (Bank 2, Sensor 1) - In The Garage with CarParts.com
![Have 2002 Chevy Blazer 6 cylinder 4 wheel drive, engine light came on, used my scanner and got a trouble code P0155 - Have 2002 Chevy Blazer 6 cylinder 4 wheel drive, engine light came on, used my scanner and got a trouble code P0155 -](https://ww2.justanswer.com/uploads/drivefast1971/2011-04-16_185235_1.gif)
Have 2002 Chevy Blazer 6 cylinder 4 wheel drive, engine light came on, used my scanner and got a trouble code P0155 -
![I have a check eng. light on. P0155, says it is upstream, bank #2 O2 Sensor. Which one is that passenger side or Drives I have a check eng. light on. P0155, says it is upstream, bank #2 O2 Sensor. Which one is that passenger side or Drives](https://ww2.justanswer.com/uploads/drivefast1971/2012-05-15_161938_1.gif)