P0173 – Fuel Trim Malfunction (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 fuel economy
- Check engine light
- Weak acceleration
Causes
- Vacuum leak (Bank 2)
- Faulty MAF sensor
- Fuel pressure issue
- Exhaust leak (Bank 2)
- O2/AFR imbalance
Diagnosis
- Check fuel trims
- Inspect Bank 2 vacuum lines
- Test MAF sensor
- Measure fuel pressure
- Check exhaust leaks
Repair
- Repair vacuum leaks
- Replace MAF sensor
- Fix fuel pressure issues
- Repair exhaust leaks
- Recalibrate fuel trims