P0174 Code: Meaning, Symptoms, Causes & Fixes
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Causes ranked by likelihood
| Cause | Likelihood | DIY difficulty |
|---|---|---|
| Vacuum leak on Bank 2 intake side — Smoke-test the intake to find the leak. | Most likely | 2/5 |
| Dirty MAF sensor — MAF affects both banks — clean first. | Possible | 2/5 |
| Low fuel pressure — Affects both banks; both lean codes typically appear together. | Less likely | 2/5 |
Symptoms of P0174
- Rough idle
- Stalling
- Check engine light
How to diagnose P0174
- Confirm the code. Read P0174 with an OBD-II scanner and note the freeze-frame data (speed, temperature, load) recorded when it set.
- Check for companion codes. Look for other stored or pending codes such as P0171, P0102 — they often point to one shared root cause.
- Check: Vacuum leak on Bank 2 intake side. Smoke-test the intake to find the leak.
- Check: Dirty MAF sensor. MAF affects both banks — clean first.
- Check: Low fuel pressure. Affects both banks; both lean codes typically appear together.
- Clear and verify. After the repair, clear the code and complete a full drive cycle to confirm P0174 does not return.
Can I drive with P0174?
Drive short distances only — a lean condition damages catalytic converters quickly.
Related codes
P0174 by vehicle
- P0174 on the Ford F-150
- P0174 on the Ford Escape
- P0174 on the Ford Explorer
- P0174 on the Ford Focus
- P0174 on the Ford Mustang
- P0174 on the Chevrolet Silverado
- P0174 on the Chevrolet Equinox
- P0174 on the Chevrolet Malibu
- P0174 on the Chevrolet Tahoe
- P0174 on the Chevrolet Traverse
- P0174 on the Chevrolet Cruze
- P0174 on the Toyota Camry
- P0174 on the Toyota Corolla
- P0174 on the Toyota RAV4
- P0174 on the Toyota Highlander
- P0174 on the Toyota Tacoma
- P0174 on the Toyota Prius
- P0174 on the Honda Civic
- P0174 on the Honda Accord
- P0174 on the Honda CR-V
- P0174 on the Honda Pilot
- P0174 on the Honda Odyssey
- P0174 on the Nissan Altima
- P0174 on the Nissan Rogue
- P0174 on the Nissan Sentra
- P0174 on the Jeep Grand Cherokee
- P0174 on the Jeep Wrangler
- P0174 on the Jeep Cherokee
- P0174 on the Hyundai Elantra
- P0174 on the Hyundai Sonata
- P0174 on the Hyundai Santa Fe
- P0174 on the Hyundai Tucson
- P0174 on the Kia Forte
- P0174 on the Kia Sorento
- P0174 on the Kia Sportage
- P0174 on the Kia Telluride
- P0174 on the Kia Optima
- P0174 on the Subaru Outback
- P0174 on the Subaru Forester
- P0174 on the GMC Sierra
- P0174 on the GMC Acadia
- P0174 on the Ram 1500
- P0174 on the Dodge Charger
- P0174 on the Volkswagen Jetta
- P0174 on the Mazda CX-5
- P0174 on the BMW 3 Series
- P0174 on the BMW X5
- P0174 on the Mercedes-Benz C-Class
Frequently asked questions
What does P0174 mean?
P0174 means system too lean (bank 2). P0174 is the Bank 2 version of P0171 — too much air or not enough fuel on the opposite cylinder bank. Causes are identical: vacuum leaks, dirty MAF, or fuel delivery problems.
Can I drive with code P0174?
Drive short distances only — a lean condition damages catalytic converters quickly.
What is the most common cause of P0174?
Vacuum leak on Bank 2 intake side — Smoke-test the intake to find the leak.
What are the symptoms of P0174?
Rough idle, Stalling, Check engine light.
How much does it cost to fix P0174?
A typical shop repair range is $10–$800, depending on which cause it turns out to be. Cheaper causes such as low fuel pressure should be ruled out first.