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2nd Gen Dakota 1997 - 2004 Dakota's

Code P0051

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Old 07-12-2014, 04:58 PM
daveespey daveespey is offline
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Default Code P0051

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!
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Old 07-12-2014, 05:22 PM
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HeyYou HeyYou is online now
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Gonna move this to the 2nd gen dakota section for you. Welcome to DF!
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Old 07-12-2014, 08:22 PM
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98DAKAZ 98DAKAZ is offline
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What brand did you buy? Bosch? The 4.7 runs bad with Bosch O2's
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Old 07-13-2014, 01:36 PM
daveespey daveespey is offline
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Default Code P0051

Replace all 4 02 sensors with OEM Denso brand.
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