[onlycyb]

Hello everyone, my car is throwing a code "lambda probe before catalyst, shear test." Does anyone know what this is about? Thank you!

[Elliott@DetailAddict]

Sounds like a bad O2 Sensor (Lambda Probe).
Clear and see if it comes back. May be a fluke.

[onlycyb]

Thanks for the response! Yeah, I tried clearing it already but it came back. Im a little confused cuz I thought it would specify either bank1 or bank2. Btw, it didnt trigger SES or CEL. Hmmm, I wonder if its something I should be worried about.

[onlycyb]

Anyone else running cobb have or had this code come up?

[MilehighM3]

These cars call bank 1 O2 sensor/lambda probe. It will state bank 2 when necessary.

[ianthegreat]

Originally Posted by onlycyb

Hello everyone, my car is throwing a code "lambda probe before catalyst, shear test." Does anyone know what this is about? Thank you!

Do you have catless DP's installed?

[onlycyb]

Originally Posted by Bmw135er

These cars call bank 1 O2 sensor/lambda probe. It will state bank 2 when necessary.

oh ok, thanks.

[onlycyb]

Originally Posted by ianthegreat

Do you have catless DP's installed?

yes

[sickem]

Any resolution on this? Got this code this am

[onlycyb]

After clearing the code a few times, it went a way. I'm assuming it had to do with the DME adjusting to new tune. Good luck!

[sickem]

Originally Posted by onlycyb

After clearing the code a few times, it went a way. I'm assuming it had to do with the DME adjusting to new tune. Good luck!

Thanks. I cleared it as well and it hasn't come back. I appreciate the follow up!

[Robbie200]

I was getting the same code once every few days on my standard car. Changed bank 1 (cylinders 1,2,3) pre cat lambda sensor and the code hasn't returned.

[sickem]

Originally Posted by Robbie200

I was getting the same code once every few days on my standard car. Changed bank 1 (cylinders 1,2,3) pre cat lambda sensor and the code hasn't returned.

thanks. when my o2 sensors were crapping out I got different codes...but in any case I've cleared the code, it hasn't come back, and the car seems to be running fine otherwise. My mechanic needs to adjust my DPs slightly next week so I'll have him ensure that the wiring is fully intact and that nothing else is amiss. I'll report back any findings.

[335bmwjohn]

I have a simliar problem and have installed 2 sets of o2 precat sensors but the code still come up everytime I start the car. I can clear it and it will not return till I shut the car off and restart. I have replaced coils, plugs, injectors, 02 Sensors, wallnut blast, vaccum lines etc... Im stuck lol

[Julian2485]

Originally Posted by 335bmwjohn

I have a simliar problem and have installed 2 sets of o2 precat sensors but the code still come up everytime I start the car. I can clear it and it will not return till I shut the car off and restart. I have replaced coils, plugs, injectors, 02 Sensors, wallnut blast, vaccum lines etc... Im stuck lol

You ever get this fixed ?

[Julian2485]

Originally Posted by 335bmwjohn

I have a simliar problem and have installed 2 sets of o2 precat sensors but the code still come up everytime I start the car. I can clear it and it will not return till I shut the car off and restart. I have replaced coils, plugs, injectors, 02 Sensors, wallnut blast, vaccum lines etc... Im stuck lol

What you do to resolve the problem