I will try to paste an article for you. Several sources indicate this is a Bank 2 O2 sensor problem and that it is failing to switch and adjust for the fuel mix. But as you can see, many defects can lead up to this O2 sensor Code 1150.
I would try to use a spray bottle of water and go around the Intake manifold and spray the water while the engine is running. An intake leak will draw water into the engine and change RPM.
If no success then try changing the O2 bank 2 sensor. You may need to wipe the computer and clear the Code.
H40 DTCs P1131, P1132, P1151 AND P1152: UPSTREAM HO2S NOT SWITCHING. DTC P1130:
SWITCHING AT FUEL
Diagnostic Trouble Codes (DTCs) P1131 bank 1
(Cylinder 1) and P1151 bank 2 indicate the fuel/air ratio is correcting rich for
an overly lean condition. The HO2S voltage is less than 0.45 volt. DTCs P1132
bank 1 (Cylinder 1) and P1152 bank 2 indicate the fuel/air ratio is correcting
lean for an overly rich condition. The HO2S voltage is greater than 0.45
DTC P1130 and P1150 indicate the fuel control system
has reached maximum compensation for a lean or rich condition and the HO2S is
DTC/HO2S Reference List
•HO2S-11 = DTCs P1131, P1132 and P1130
•HO2S-21 = DTCs P1151, P1152 and P1150
•Excessive fuel pressure.
•Leaking fuel pressure regulator.
•Low fuel pressure or running out of fuel.
•Contaminated fuel injector(s)
leaks after the MAF.
•Vacuum leaks (vacuum lines and
•Restricted air inlet.
•Improperly seated engine oil dipstick
•Stuck open EGR
•Exhaust leaks before or near the HO2Ss.
•Check intake air system for leaks, obstructions and damage.
•Check air cleaner element, air cleaner housing for
•Verify integrity of the PCV system.
•Check for vacuum leaks.