P1130moderate severityPowertrain
Lack of HO2S Switch — Adaptive Fuel at Limit (Bank 1)
on 2017 Ford Flex 3.5L V6 EcoBoost · AWD
What this code means
The upstream heated oxygen sensor on Bank 1 is not switching properly between rich and lean, and the adaptive fuel strategy has reached its correction limit. The PCM can no longer compensate for the condition.
Symptoms
- Check Engine Light
- Poor fuel economy
- Rough idle
- Hesitation
- Failed emissions test
Common causes
- Large vacuum leak
- Faulty HO2S sensor Bank 1
- Exhaust leak near sensor
- Fuel system issue (low pressure, leaking injector)
- MAF sensor malfunction
Diagnostic steps
- Check for vacuum leaks with smoke test
- Monitor O2 sensor switching on scan tool
- Check fuel pressure
- Inspect for exhaust leaks near O2 sensor
- Check MAF sensor readings
Repair notes
Repair vacuum leaks. Replace O2 sensor if not switching. Check fuel system.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1