P0174 Engine is running lean (bank 2)

Check this first

Same checks as bank 1 – if both banks are lean, look for one shared leak or a fuel supply problem.

What usually fixes it

In the order a good shop checks them. Typical total: $67–$1,006 at $130 an hour.

1. Vacuum or intake leak

   $171–$444

   A leak in a shared pipe shows on both banks at once.

2. Air flow sensor

   $112–$401

   One sensor feeds both banks, so it upsets both.

3. Fuel pressure or injectors

   $410–$1,006

   A tired pump leans out both sides under load.

Code titles are the generic SAE definitions. Prices are typical US parts and labor for a common car or light truck – a guide for judging a quote, not a quote. Always confirm a repair against the vehicle in front of you.