check engine p0138 code on 2004 Saturn Vue

Dear Staff: I,ve been driving with the light on for weeks. I believe it is the oxygen sensor. Error high voltage Bank 1 sensor 2. Is this sensor the one after the catalic converter. How can i check it if its bad? How can i check the wiring if it bad? can it be the fuel presure too high? Symtoms are some hesitation and some odor of gas or exhaut. I bought a code reader. Can i get more info from it to help me pin down the problem. Thank-you for the support.......Gino

by in Newbury, MA on May 13, 2010
2 answers 1 comment
ANSWER by on May 13, 2010
This code usually means that the heating element has shorted to the signal circuit inside the Oxygen Sensor. This code refers to the Oxygen Sensor AFTER or at the rear the Catalytic Converter on the REAR bank of cylinders as you look at the front of the car. I would recommend replacing this sensor with a factory part or OEM equivalent. Once the heater element causes this code, there is little to be done with the sensor. If the car was running too rich, you would have a 'fuel trim too rich code' like a P0172 and P0175. You just have code P0138, yes?
COMMENT by on March 02, 2011
I have a p0138 code on our 2001 Saturn SC2 we have already replaced the o2 sensor in bank 1 sensor 2 can you point us in the right direction please.
ANSWER by on May 31, 2015
yes it is the oxygen sensor but it could be a short in the wire that pre heats the oxygen sensor . yiu can check it for proper voltage im not sure of hand what it is but check google for that info