O2 Sensor Upstream / Downstream
Thread Starter
Driver School Candidate
Joined: Sep 2012
Posts: 17
Likes: 0
From: FL
O2 Sensor Upstream / Downstream
Whats the difference?
I am getting a code P1135 and the guy at AutoZone said it was the downstream sensor. I think it is the upstream one. I am planning on replacing both, want to make sure I understand and order the correct DENSO part.
Thanks,!
I am getting a code P1135 and the guy at AutoZone said it was the downstream sensor. I think it is the upstream one. I am planning on replacing both, want to make sure I understand and order the correct DENSO part.
Thanks,!
Pole Position
Joined: Sep 2012
Posts: 338
Likes: 16
From: Oregon
P1135 is a Bank 1 Sensor 1 heater circuit malfunction. Sensor 1 is the pre-cat A/F sensor not the O2 sensor after the cat. You should be able to check this with your volt/ohm meter. Check for heater resistance. If the heater is burned out, you will get an open circuit. If you get a low resistance (a few ohms) it is ok. Then check to see if its getting power.
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