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!