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How many O2 sensors on a 3

Tiny
ANONYMOUS
  • MEMBER
  • 2003 DODGE DAKOTA
  • 140,000 MILES
How many o2 sensors on a 3.9 v6, I know of the one by the C. Converter (downstream) is there another somewhere else. I'm getting two codes PO-0037 & PO0137- the check engine lite is on
Friday, February 1st, 2013 AT 3:43 AM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,742 POSTS
A V-type engine will have a minimum of three. One is right before each catalytic converter, and the downstream one can be in the Y-pipe where the two sides connect. For better monitoring of the converters there is usually two downstream sensors; one right behind each converter.

P0137 †Oxygen Sensor Circuit Low Voltage (Bank 1 Sensor 2)

Usually this code sets in response to a wiring problem, not a sensor problem. Bank 1 is the driver's side and sensor 2 is the one after the converter. I don't find a reference to the other code.
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Friday, February 1st, 2013 AT 4:08 AM

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