So in the midst of diagnosing a problem I scanned the car to see what codes it was throwing. It came back with the obvious ones cause I have no cats but the one that threw me for a loop said o2 sensor heater circuit malfunction bank 1. Now I know that bank one means the one attached to the EM but does that mean the sensor is bad or its having a wiring issure?

 

The sensor is bad, change it

 

Thanks. Would that make the idle inconsistent and the Air/Fuel ratio go crazy?

 

Yup, I have the same issues unfortunately.

 

Ok so onto my next question. Has anybody used a "universal" o2 sensor? They have those at the parts store in my area. basically its a o2 sensor with no connector. You would use the connector from the OE one im assuming. Any ideas/feedback?

 

I wouldn't see why it wouldn't work. Just splice the wires.

 

So ive been looking for a diagram to figure out which wires are which when it comes to the o2 sensor and this is what Ive found. it was on the dsm forums so can someone tell me if this applies to the lancer as well.

 

Ok so officially that diagram is very similar and the universal sensor works like a charm. turned off the CEL within 5 minutes. If anyone needs any help doing this just msg me

 

Did this diagram work for you,? the colors on my sensor are blue, red, white, & black on the original, am going to get the universal part & will need to know how to apply it to splicing in. Thanks Bob RMo8235376@aol.com

 

I bought a Pre-cat Bosch Universal o2 sensor for my vehicle (according to auto parts dealer)... and it comes with "Black, Grey, White, White".

please advise.

 

I also bought a Bosch sensor for front from Pep Boys ($80, lowest price).
It shouldnt matter about the color codes, as the harness only connects in one way.
Added tip, check if the old one was torqued tight, when I went to change mine, it seemed very loose, as there is very little thread area, I installed the new one anyway, will always wonder if tightening would have solved the problem.

 

Universals work fine, I use the universal for the second O2 sensor as I needed the extra length.
Just make sure you connect the wires according to the diagrams that come with the universal.

 

Can someone post a direct link to a good EM o2 sensor. Im having trouble telling which sensors are for which part of the car. Im currently using rockauto to do my searching, here is their list of sensors.

http://www.rockauto.com/catalog/rafr...279855-2620311

 

Anything's good, just watch out for the universals as they don't have the stock connector, you have to do splicing and wiring. Check autozone.com or advanceautoparts.com and they'll list the OEM sensor and you can make your choice from there...

 

So if the o2 sensor says "front" i can still use it for any part of the car? im confused. I understand the universals need to be spliced, but i havnt looked at the o2 sensor under the car yet, just at the EM.