2007 Saab 9-3 2.0T O2 Sensor Replacement

Just a simple how-to video on replacing your upstream oxygen sensor in a NG Saab 9-3 (phone battery died at the end, but the important bits are there). Even in the cold, it's a straightforward process. Merry Christmas to my Saab!

Symptoms of a failing O2 sensor (could be in combination with other problems, e.g. spark plugs, coil packs, MAF sensor, dirty throttle body, etc.):
- less than usual fuel economy
- rougher start/idle/power delivery at higher revs
- a few random misfires (without a check engine light, observable with scan on a OBD2 reader and app)

A few technical problems to look out for:
- rusty bolts for heat shield (lube is your friend, don't over torque), heat shield has to be angled the right way to slip out
- electrical connector harness clip can break, be careful/gentle with both the clip and the slide-out lock (red)
- O2 sensor can be seized, access is tight even with the right tool (see video for potential solution), remember to apply anti-seize to the threads on replacement and not to over-tighten.

Don't forget to reset your ECU (e.g. disconnect your battery for ~1/2 hr.) to let the car relearn the new sensor's characteristics.

Good luck!