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deldakota
Dodge Dakota
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12/18/2005
13:41:58
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 Subject: code po155&po051
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Message:
2001 4.7dakota is showing these codes....i think po155 is an o2 sensor issue but im not sure which one.....not sure about po051 though.....thanks
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Mattleg
Dodge Dakota
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12/18/2005
15:37:56
| RE: code po155&po051
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Message:
P0155 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
P0151 O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1)
Think you ment po151 since codes dont go below po100
Anyway, I would say you have a bad O2 sensor on the number 2 cylinder side, and whichever one is closes to the engine along the exhaust.
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deldakota
Dodge Dakota
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12/18/2005
19:29:45
| RE: code po155&po051
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Message:
nope........just checked it again...po051.....but i have not been able to find out what it means either.....
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bridges
Dodge Dakota
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12/24/2005
02:22:18
|  RE: code po155&po051
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Message:
PO 51 has to do with a rich mixture.
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dickc
Dodge Dakota
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12/24/2005
22:20:32
| RE: code po155&po051
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Message:
P0051: O2 Sensor Heater Circuit Low 2/1
P0155: O2 Sensor Heater Failure 2/1
P0151: O2 Sensor shorted to ground 2/1
The heater power comes from the PCM directly so it is probably a bad sensor. The forward O2 sensors have a heater relay.
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Red99DakR/T
Dodge Dakota
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12/25/2005
12:56:55
| RE: code po155&po051
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Message:
Just so you don't get blind sided by the terminology, when you go to a dealer or an autoparts store, they refer to the O2 sensors as the upstream sensor and downstream sensor. Before you go through the money loss of the new sensor, I recommend taking out the old one and clean it, then put it back in and try it again. Of course, make sure you disconnect the battery when doing this to prevent any chance of accidently setting off the AirBag.
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