P0174 – System Too Lean (Bank 2)
Want to confirm the real cause of this fault code?
A high‑quality OBD2 scanner gives you live data, fuel trims, sensor readings and freeze‑frame information — exactly what you need to verify the root cause of this code with confidence.
Symptoms
- Rough idle
- Hesitation
- Poor acceleration
- High fuel trims
- Possible misfires
Causes
- Vacuum leaks
- MAF contamination
- Weak fuel pump
- Clogged filter
- Exhaust leaks
Diagnosis
- Check fuel trims
- Inspect vacuum lines
- Test MAF
- Smoke test
- Check fuel pressure
Repair
- Fix vacuum leaks
- Clean or replace MAF
- Replace filter
- Repair exhaust leaks
- Replace pump