MonguseAz

Just installed a rebuilt motor, and several other items. The problem I am having is the O2 sensor for the right side pre-cat causes a fuse to blow and also have a "Service Engine Sooon" just wanted to know if anyone had thie happen and where would be the best place to start looking for the short. I had a shop look at it as I had severa other codes before and this is that one I need to fix.

jwog666

try unplugging the sensor and see if the fuse still blows, if not then u may just have a bad sensor, otherwise check the harness as it works its way over the bellhousing area, its common to get it pinched between the engine and trans

WhiteFoxGT

This

The trans harness isnt very big. Its one plug up on the firewall on the passenger side, and runs down the top side of the trans. I've seen the wires rub through on a few spots above the trans, or like stated above its possible it got sandwiched between the eng/trans

MonguseAz

Thanks for the input maybe I just yank the harness to test it. I did forget to say the shop said they replaced the O2 sensor and it a as still poping the fuse.