I don't know if this is the right place to ask, but here goes. I have a 2000 Tracker with the 2 litre engine. It started running rough so I hooked up my code reader to it yesterday to see if there was a stored code and there was. The code on it was P0135 Malfunction of 02 sensor cucuit, Bank 1 sensor 1. Am I correct in assuming that the sensor in question is the pre cat sensor ? I'd hate to replace the wrong one as the sensors are $250 each! I checked all of the wires to make sure it wasn't something stupid like it came disconnected or a frayed wire.


Any suggestions would be greatly appreciated!


ROBEdited by: ROBZUK

sensor 1 si always pre cat, sensor 2 would be post cat


bank one is always the side of the engine that no 1 cyl is on. in your case, dont matter.


answer to question. Yes

Thanks Eric, when we come up the barley pops are on the Irishman!


ROB

that reminds me, you want some Schaeffers stuff, dont ya

My son has a Blazer and it has 4 sensors.


Left #1


Right #1


Right #2


Post Cat


He was having trouble with Right #1 being intermitent so I moved it to Post Cat and it has been working ever since. I had a feeling it just might work if I moved it to a cooler part of the syste.