P0170 – Fuel Trim Malfunction (Bank 1)
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Symptoms
- Rough idle
- Hesitation
- Poor fuel economy
- Check engine light
- Weak acceleration
Causes
- Vacuum leak
- Faulty MAF sensor
- Fuel pressure issue
- Exhaust leak
- O2/AFR imbalance
Diagnosis
- Check fuel trims
- Inspect for vacuum leaks
- 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