I just had codes p0164 and p0162 pop up.
Oxygen sensor related.
This is the 2nd time now in less than 5000 miles I’ve had oxygen sensor issues since doing the “burble” tune from velocity.

 

Any way to remove the P167F-00? I have a Velocity AP tune previously now the car is back to stock but I am afraid it won't pass smog with this error. Thanks!

 

That particular "Tune" may be running a bit too "Rich"... Not letting the Cats to burn off enough exhaust/pollution before it hits that particular downstream 02 Sensor thus causing the error code.

Also, what is the normal operating temp/range of the engine's thermostat? It might also be at too cool of a degree setting/range which will also cause 02 problems because the engine's optimal running temp isn't high enough robbing it's optimal operating temp and efficiency.

Just a couple things to check and think about. Of course, as always, YMMV...