P0174Medium urgency
System Too Lean (Bank 2)
Fuel System · Air/Fuel Mixture
⚠️ Drive with caution — lean conditions can damage engine over time.
What this means
Bank 2 is running lean — too much air relative to fuel. Mirror of P0171 but affects the passenger side bank on V6/V8 engines.
Likely causes
- Vacuum leak Bank 2 intakeMost common
- Dirty MAF sensorMost common
- Clogged fuel injectorsCommon
Estimated repair cost
Vacuum leak repair$75 – $250
MAF sensor replace$100 – $300
Fuel injector clean$100 – $250
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Frequently asked questions
What does P0174 mean?
Bank 2 is running lean — too much air relative to fuel. Mirror of P0171 but affects the passenger side bank on V6/V8 engines.
Is P0174 serious?
Drive with caution — lean conditions can damage engine over time.
How much does it cost to fix P0174?
Repair costs for P0174 range from $75 – $250 depending on the root cause and your vehicle.
Can I drive with P0174?
You can drive short distances but should have it repaired within 1-2 weeks to prevent further damage.