Hello,

Which side is the bank 2 cat on the exhaust? I'm getting this alarm a lot and the car is louder than normal. I suspect a crack in the exhaust as this is a common problem on this car. Just want to tell the mechanic where to look.

Thanks!

 

passenger side, I guess

 

Confirmed, Bank 2 is on the Passenger side...

 

Great. Thanks! And the most common point of failure would be under the heat shield where it goes into the y-section?

 

I continuously have this error code pop up. Like you said, it's most likely a small hole in the exhaust pipe. I took mine to an exhaust shop and they welded a small hole shut which seemed to help for a few months, but it's back. My next step is probably to replace the entire Y pipe assembly.

It could also be a bad O2 sensor.

 

It could be a small leak, but a catalytic converter with a lot of miles can just become "inefficient" enough over time that it triggers a code and requires replacement to get it back in spec.

I had a similar code and had an exhaust shop that I trust check it out and not find any leaks.

Instead of replacing the factory cats, I just put one of these "extenders" on and never had another issue with the code. I got mine off of Ebay, but it was more of an angled one that could be rotated in order to fit since the exhaust is close to the body. I just grabbed these images online.










The purpose of that sensor is basically for state emissions testers to see if the catalytic converter is in spec and working properly, a "pass/fail" sensor. It's not going to effect engine operation.

 

What does the extender do? Pull the sensor out of the stream?

 

Yea, basically.

You would think it wouldn't "work" since it's still air tight but pulling it out of the direct exhaust stream fools the sensor enough so it's not an issue.

 

Interesting! I'll have a look at that. Thanks for the info.