Thanx for the additional info. I sent it on to my son. Haven't heard from
Behold Beware Believe
: > :> My son called me about a fault code on his 2000 Dak 4x4 w/V6, manual
: > : > trans.
: > : > He said the code is P0138. Looking at allpar.com, the code says HO2S
: > : > Circuit
: > : > High Voltage Bank 1 Sensor 2. Can anyone tell me what this means and
: > where
: > : > this sensor is located, if it needs replacing? Does he need to take
: > : > to
: > : > a shop or can he do it himself? Thanx.
: > :
: > : This is the post-cat oxygen sensor (little thing sort-of looks like a
: > spark
: > : plug sticking out of the exhaust pipe, behind the catalytic converter,
: > with
: > : a wiring harness coming out of it), and since the computer thinks the
: > : voltage is high all the time, it could be one of two things (most
: > commonly).
: > : Either it's a melted/shorted wire, as the wiring harness runs right
: > to
: > : the exhaust, and if any of the hangers/tie-wraps come loose, the
: > : could come in contact with the exhaust.
: > :
: > : If the wiring all checks out, then you've most likely got a bad oxygen
: > : sensor. Replacement is fairly straight-forward... you disconnect the
: > : electrical connection about 12" back from the sensor itself (the
: > has
: > : a pigtail), and unscrew it. That's the tricky part. You either need
: > : oxygen sensor socket (like a really deep socket, but with a slot cut
: > : to allow for the wire pigtail), or a wrench (flare-nut is best,
: > : second choice, open-end as a last resort). It's going to be TIGHT.
: > : some penetrating oil on it first (Kroil, PB Blaster, or the like...
: > : won't cut it). On my friend's Durango, the orientation of the O2
: > was
: > : such that we had to get really creative with our wrench placement, and
: > : of cheater pipes.
: > :
: > : The sensor will run somewhere around $50-$80, and can be had at most
: > : parts places.
: > :
: Also, make sure that they give him the correct sensor. The post sensor is
: different than the pre sensors and even though they will interchange in
: mounting positions, they will not plug in to each others connection.
: ask me how I know this. The best idea is to closely compare the connector
: and wire length with the old one before you even leave the store (IOW,
: the old one out before you even go) . I believe that they are color coded
: at the connector and the post unit has a cage over the tip and pay close
: attention to the key in the connector as it is in a different position on
: the post and pre sensors otherwise you will be making multiple trips.
: If at first you don't succeed, you're not cut out for skydiving
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