03 H6 P0174

bank 2 lean- driver's side or passengers?

Popped up on the test drive after spending all day replacing the rear steel brake lines.

I see that code mentioned a lot, almost never see the resolution. Haven't seen one yet searching through the posts here, need to dig deeper.

Have just recently run a bottle of techron through it, 2 separate tankfulls a few tanks apart.

Only symptom it has had (for a long time) is a brief hesitation giving it some gas pulling away from a stop.

New plugs in a few weeks ago.