I have code P023 and have carried out a smoke/leak test to investigate.

I didn't find any leaks externally but when I do the smoke test on the Bank A intake/charge air circuit I get some smoke appearing out of the Bank B intake pipe.

I carried out the smoke test by removing the air intake box and MAF sensors and injecting the smoke into the Bank A pipework that connects to the MAF sensor housing/air filter box.

Is this a problem? If so could it be causing my P023 code?
Grateful for any help/advice All the best
Chris