I have a 2004 Saturn Vue Red Line. I am looking for information on the location of ground wire as I have a P2256 code and want to check my ground wire connections first, prior to changing the O2 sensor.
Thanks in advance.

 

Thank you for ignoring the sticky that says don't post in this category for the help and suggestion center.

If you are referring to where the ground wire is connected for the O2 sensor, none of the active members of the form currently have a view field service manual. You can probably find the electrical schematics on the internet. Use Google and go through the images. It's amazing what you can find there.

 

Find the engine harness grounds and check those. Best bet.
bank 2 is next to the radiator. Just an fyi.
and make sure to buy oem for that. Dont buy the $10 ebay special

 

Or you can unplug the connector and jumper the ground pin/socket (find a schematic) to a non-corroded metal part of the frame. It should be near zero Ohms resistance (<1 anyway). If it reads infinite resistance, there is a broken ground somewhere along the line.
If you do the positive by mistake, you will of course blow a fuse