Originally Posted by Simon930
Why did you unplug the 02 sensors?
You should of just unscrewed them and left them hanging
A lot of the time it's a lot easier to unclip a weatherpack connector than to unscrew an O2 sensor. O2 sensor threads get dirty from exhaust particulates so they take some effort, it usually requires a big wrench (hard to fit an open ended 22-24mm wrench inside a packed engine bay, or even with an articulated wrench get the leverage), and you have to twist the wire many turns. To unclip a wire you often can do it with a finger nail or small flat blade screw driver then just pull.
2009 BMW 135i, 6 MT, M Sport, DIY DCI, Cobb AP, Apex 18x8.5+9.5, 235/265 Starspecs