[Oliverms3]

Quick question guys... I have this issue with a cel p0139 (rear o2 sensor) it's keep on coming back everytime I reset it with the AP. I'm wondering if this issue is coming from a leak in the dp. .. I have a picture below of my dp showing the part of the flex section. If you look closely, it has black soot on the weaves. Possibly it's not sealed anymore?

Thanks

 

[mazdaspeedmyk]

Did you try replacing the sensor Oliver?

 

[Oliverms3]

Did you try replacing the sensor Oliver?

Yah.. they're new.

 

[Oliverms3]

Did you try replacing the sensor Oliver?

Yah.. they're new.

 

[pdc001]

A flex pipe not sealed anymore can cause the rear o2 sensor to go off. Wrap it with some wrap that people use to wrap exhaust manifolds with to see if that would cure the problem.

 

[Oliverms3]

I just removed it and welded a new pipe

 

[pdc001]

Even better!