2001 Dakota 4.7 with A/C. One 02 sensor went out so I replaced them all. Now getting a Code: P0051 H02S Sensor Control Circuit Low (Bank 2 Sensor 1)


When driving with scanner on here is the data
Oxy Sensor 2 Bank 1 .660 V (some fluctuations)
Oxy Sensor 1 Bank 2 1.000 V (no fluctuations)
Oxy Sensor 1 Bank 1 .660 V (some fluctuations)
Oxy Sensor 2 Bank 2 .660 V (some fluctuations)


I have replaced Oxy Sensor 1 bank 2 twice now with factory parts and still throw the code.


question: is it possible my 02 Sensor Relay is going bad or is there a fuse somewhere that could be bad?


Thank you in advance!

 

Gonna move this to the 2nd gen dakota section for you. Welcome to DF!

 

What brand did you buy? Bosch? The 4.7 runs bad with Bosch O2's

 

Replace all 4 02 sensors with OEM Denso brand.