P1151 Lack of HO2S-21 Switching, Sensor Indicates Lean (Bank 2)Possible Causes Setting Conditions
•Check for air leaks after the MAF sensor mounting location
•Check for air leaks in the EGR system and in its related hoses and/or valve
•Check for air leaks in the PCV system and in its related hoses and/or valve
•HO2S connector is damaged (check pins for damage, and for moisture)
•HO2S signal circuit open, shorted to ground, shorted to voltage
•HO2S has failed (it may be contaminated with fuel, silicone or water)
•Low fuel pressure or vehicle driven until it was out of fuel
•Vacuum hoses leaking and/or damaged
Engine running in Closed Loop; and the PCM detected that the Bank 2 HO2S-21 signal was less than 0.450v. In this case, the PCM is "correcting" rich for an overly lean condition.
This code sets in 2 Trip(s).
This code will turn on the MIL (Malfunction Indicator Lamp)