P0174: System too lean (bank 2)

What does it mean?

System

Powertrain (engine and transmission)

Subsystem

Fuel and air metering (sensors)

Type of code

Generic code: means the same on every make.

How urgent?

Have it checked soon. You can usually still drive, but avoid long trips and heavy loads.

Possible causes

• Air or vacuum leak in the intake
• Dirty or faulty sensor (air flow, manifold pressure)
• Damaged wiring or a corroded connector
• Clogged air filter

Tip: don’t just clear the code. Clearing a code doesn’t fix the cause. It often comes back, and the stored data that helps us find the cause is then gone.