I got a peake research tool and today it read 0b and then 0f. Now I have been told that this is Pre cat sensor response time cyl 1-4.
I do not know what this is and anyone please help me? I also noticed that smoke comes out of the drive side exhaust even after I shut off the engine. It is there for only a short time but I can clearly see it.

Thank you

cyl 1-4 is pass side in Canada

Thanks and does anyone know about the pre cat sensor response time?