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2000 MPV P0031

  #1  
Old 09-29-2007, 04:38 PM
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Join Date: Aug 2007
Posts: 4
Default 2000 MPV P0031

I have found three of the 4 or more O2 sensors and from reading old posts I think this code refers to the engineward (flow-wise) of the two on the manifold between the (below the front windshield) firewall and the block (rear of the block facing engine from front of car).

Is this correct?

Then P0051 then refers to the upper sensor on the oposite bank...

What codes refer to the other sensors and how many more are their... for instance does code P0031 refer only to that upper O2 sensor and some other code refers to the lower...

Thanks.
 
  #2  
Old 09-29-2007, 08:04 PM
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Join Date: Aug 2007
Posts: 4
Default RE: 2000 MPV P0031

Also, is there any trick to disconnecting the harness plug connector? I was having trouble getting the lower one disconnected without being able to see it when I started pulling it by mistake... before finding the upper one.
 
  #3  
Old 09-30-2007, 08:36 AM
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Posts: 1,324
Default RE: 2000 MPV P0031

Those codes indicate o2 sensor heater failure. You can test the heaters with an ohm meter. The 2 black wires are for the preheater circuit. Unplug them and ohm them outfirst. 6 ohms or so is good. They get power from the black/white wire.
 
  #4  
Old 10-03-2007, 07:32 AM
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Default RE: 2000 MPV P0031

What does the plug connector look like ? I dont want to break it but could be 100,000 miles has just made it resistant to removal...hard to say when you can't see anything back there. Is there something to depress or pry up on the connector?
 
  #5  
Old 10-03-2007, 08:09 AM
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Posts: 1,324
Default RE: 2000 MPV P0031

You can follow the o2 sensor to find the connector. There is a little red slide tab that locks it then just push the other tab and pull.
 
  #6  
Old 10-04-2007, 09:09 AM
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Default RE: 2000 MPV P0031

Ah a slide tab. That expains it. Thanks.
 
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