What is wrong with a Cadillac CTS 2007 when it will crank but will not run?

Answer 1

Looking up from below the engine the sensor is located about half way up above the catalytic converter. Look for a black cable and follow it into the side of the engine block. (finding it is the easy part). To get a wrench on to the end of the sensor I had to drop the catalytic converter off it's mounting bracket . You can unscrew the sensor and follow the cable back up through the engine compartment. The end of the sensor is located behind the engine block, there are several other electrical connections in the area. Look at the number on the cable to type of cable and disconnect the cable. Plug in the cable and try and follow the same route back to the side of the engine, reposition the new sensor. I( had to reroute the cable as it was a pain to follow the same cable in the car). If you have the car on blocks you can check the sensor. Turn the engine on if it cranks your on your way. If not you may have the wrong connection behind the engine block. If the engine turned over your OK. Note :I had a very difficult job trying to remount the catalytic converter because the mounting studs interfere with the bracket. I cut the studs down with a hacksaw just enough to slide the bracket back on. Hope this helps Mick Richmond VA