my 1990 740 turbo is runnin kind of rough and is hard to start, i pulled the codes and got a heated oxygen sensor. how do i go about fixing/ replacing this??

 

Unplug o2 sensor, unscrew old sensor, screw in new sensor, plug back together. You can also use a universal type for your car just follow directions and use your old plug. Autozone for a 15$ deposit will let you use the tool to unscrew the o2 sensor....You get the $15 back when you return the tool.

 

This is off topic, but the power cuts out around 3500 rpm, the engine keeps runnin but its like it goes into neutral until i let off the gas