P0174: System Too Lean (Bank 2)

What does P0174 mean?

P0174 is a diagnostic trouble code indicating "System Too Lean (Bank 2)". The engine is running with too much air relative to fuel (lean condition). This can cause hesitation, rough idle, and potential engine damage if left unaddressed. The fuel metering needs attention.

Symptoms you may notice

• Check engine light (MIL) illuminated on dashboard
• Poor fuel economy
• Rough idle
• Hesitation during acceleration

Common causes

• Vacuum leak (intake gasket, hose, or PCV valve)
• Weak or failing fuel pump
• Clogged fuel injectors
• Dirty or faulty mass airflow (MAF) sensor
• Exhaust leak before the O2 sensor

What should you do?

Schedule a diagnostic appointment at your earliest convenience. The vehicle is generally safe to drive short distances, but the underlying issue should be addressed to prevent it from worsening.