O2 Sensor Upstream / Downstream
#1
Driver School Candidate
Thread Starter
Join Date: Sep 2012
Location: FL
Posts: 17
Likes: 0
Received 0 Likes
on
0 Posts
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,!
#2
Pole Position
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.
Thread
Thread Starter
Forum
Replies
Last Post
SICK350
ES - 5th Gen (2007-2012)
7
03-11-14 05:20 PM
swat1727
GS - 2nd Gen (1998-2005)
0
10-01-08 11:50 AM