P1298 – Fuel System Sensor Correlation Fault
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Symptoms
- Check engine light
- Rough idle
- Hesitation
- Poor fuel economy
- Emissions issues
Causes
- Faulty fuel pressure sensor
- MAF error
- O2 sensor fault
- Vacuum leak
- ECU interpretation fault
Diagnosis
- Compare sensor data
- Check fuel pressure
- Check MAF readings
- Check O2 sensor response
- Smoke test intake
Repair
- Replace faulty sensors
- Repair vacuum leaks
- Clean or replace MAF
- Update ECU software
- Clear codes and road test