supercow

I'm confused, which 02 did you extend? you need to extend the 2nd one past the cat.

I had my first one in the spot that comes on the headers forever, never extended it.

zoned019

man, this is not a hard concept...why are there so many threads on it?

one o2 sensor BEFORE the cat one AFTER the cat

header
flex pipe
1st o2 sensor
CATALYTIC CONVERTER
2nd o2 sensor
rest of exhaust

one o2 sensor BEFORE the cat one AFTER the cat.

you may have to extend the wires for the 2nd o2, you may not. it all depends on your setup. Either way, its 4 wires, it should take you 15 minutes to solder and heat shrink extensions in there....very simple

if you have two working o2 sensors and one cat, then you put the 1st sensor before the cat and the 2nd sensor after the cat you will NOT have a CEL.

deestibo

Question what code do you have?Also is the first o2 sensor suppose to be on header or the flex pipe?Mine is on the header and I have code po135 could that be my issue?My second o2 is on the flex pipe then comes cat.thats wrong?

landshark16

Im having problems with the second sensor. I did cut/add wires and soldered them together, never got them mixed up, and everytime it didnt work. I was getting P0136 which is downstream O2 sensor malfunction.

lilo shark

maybe you short circuted a fuse or something or else the o2 is bad?

Alex01tib

PM me with how you wired in the simulator and what you did with the 02 sensor.

hamhead

Well, your wiring has to be screwed cause the o2 simulator would work whether the sensor was good or not if you wired it properly.