Question 1

What does P0174 mean?

Accepted Answer

P0174 - System Too Lean (Bank 2). Engine running too lean on bank 2. If both P0171 and P0174 are present, the lean condition affects the entire engine.

Question 2

What are the symptoms of P0174?

Accepted Answer

Check engine light, Rough idle, Hesitation, Poor economy, Misfires

Question 3

What causes P0174?

Accepted Answer

Vacuum leak (affects both banks), Dirty/failed MAF sensor, Low fuel pressure, Clogged fuel filter, Cracked intake manifold

Question 4

How much does it cost to fix P0174?

Accepted Answer

Typical repair cost: $50-$800. If P0171 AND P0174 (both banks lean), the cause is something affecting the whole engine — MAF, fuel pump, or large vacuum leak.

P0174 — System Too Lean (Bank 2)

Don't guess — diagnose P0174 the right way

Common symptoms of P0174

Common causes of P0174

Repair cost & difficulty

Vehicles commonly affected

Related trouble codes