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P0174 System Too Lean (Bank 2)
What it means
Bank 2 is running lean — too much air or not enough fuel. When P0171 and P0174 appear together, look for something shared like a vacuum leak, MAF, or fuel pressure.
Severity: Moderate
Can I drive it? Short-term driving is usually OK; fix soon to avoid misfires and damage.
Common causes (most likely first)
- Vacuum leak
- Dirty or faulty MAF sensor
- Low fuel pressure
- Leaking intake gasket on bank 2
- Clogged injectors
Likely fixes
- Smoke-test for vacuum leaks
- Clean/replace MAF sensor
- Test fuel pressure
- Replace intake gasket if leaking
DIY parts cost
$10–$250
Approximate estimate
Shop repair cost
$100–$800
Approximate estimate, parts + labor
DIY difficulty
Easy to Moderate
Varies by vehicle
Cost ranges are rough, approximate U.S. estimates and vary widely by vehicle, region, and parts brand. Always confirm the diagnosis before buying parts.
Parts you may need
- MAF sensor cleanerCheck price
- Vacuum hoseCheck price
- Intake manifold gasketCheck price
- Fuel filterCheck price
Affiliate links are placeholders. Verify fitment for your year/make/model.