Engine code question

[kevfish1]

Just had my 98 dodge ram 1500 serviced and the check engine light was on. They hooked it up to a computer and got a code. They stated I would have to bring to a dodge dealer. Hoping someone here can tell me what this code means.

PO138 02 sensor circuit high voltage BAN K 1 sensor 2.

anybody?

[PierBridge]

I Googled this up for ya!

Bank 1 Sensor 2 is downstream left rear of side of transmission

1/1 is upstream left front

2/1 is upstream right front

2/2 is downstream right rear

A code P0138 may mean that one or more of the following has happened:

* Faulty O2 sensor

* Short to battery voltage in O2 sensor signal circuit

* High fuel pressure (not as likely)

Possible Solutions

Here are some potential solutions:

* Replace O2 sensor

* Repair short to battery voltage in o2 sensor signal circuit

[kevfish1]

is this hard to replace? not sure what I would be looking for, Is this sensor mounted to the transmission??

[Macgyver55]

O2 sensor is in the exhaust pipe. Sensor 2 would be behind the converter.

Very eassy to replace if thats the problem. Unplug, remove sensor, reinstall new sensor and plug in.

[jeffreyd]

my question is what did you have serviced? did you have the transmission done? since they would be close to the sensor if you did, they may have unplugged it or cut it some how. Also if you can take the old sensor out and take it with you if you go aftermarket parts store, double check the wire length. Some of the auto part stores sell a new sensor but the wiring is too short. Good luck.

[kevfish1]

would i have to take exhaust pipe off?

[jeffreyd]

nope it is in the pipe, you will see it sticking out, should have a cover over the wiring to keep the heat off the wires. Should be able to unplug the sensor use a wrench and loosen it then remove by hand just like threading a bolt. there will be two one between the engine and cat and one after the cat

[Big Buck Buster]

You shouldn't have to take the pipe off. 7/8" wrench will work, if it is accessible enough. The auto parts stores have O2 sensor sockets for the tricky to get to ones.

[Jeremy airjer W]

Sounds like a bad O2 to me as well.