P1151 Lack Of HO2S21 Switch Sensor Indicates Lean

Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1151 Description
Lack Of HO2S21 Switch – Sensor Indicates Lean is one of the definitions for the P1151; however your vehicle’s manufacturer may have a different definition for the P1151 code. Please check below for your specific make.
P1151 Information for specific makes
P1151 FORD
P1151 HYUNDAI