Does anyone know what the 1151 code is?

 

"Lack of H02S21 switch -Sensor Indicates Lean"

 

From the Ford Service Manual
See Possible Causes for DTC P1130
P1130 - Lack of HO2S-11 Switch, Fuel Trim at Limit

Electrical:
- Short to VPWR in harness or HO2S
- Water in harness connector
- Open/Shorted HO2S circuit
- Corrosion or poor mating terminals and wiring
- Damaged HO2S
- Damaged PCM
Fuel System:
- Excessive fuel pressure
- Leaking /contaminated fuel injectors
- Leaking fuel pressure regulator
- Low fuel pressure or running out of fuel
- Vapor recovery system
Induction System:
- Air leaks after the MAF
- Vacuum Leaks
- PCV system
- Improperly seated engine oil dipstick
EGR System:
- Leaking gasket
- Stuck EGR valve
- Leaking diaphragm or EVR
Base Engine:
- Oil overfill
- Cam timing
- Cylinder compression
- Exhaust leaks before or near the HO2S(s):

 

Thanks for all your help. This is a great site!