MAF sensor or O2 sensors?

[champeny]

2005 330xi 106K miles

My car started running rough and I was getting cylinder misfire fault codes. It almost felt like it was missing on a cylinder or two, but just generally rough. Not sure if the plugs were previously changed since I bought the car so replaced the spark plugs and ignition coils. Still have the same problem and still getting same fault codes. Also getting a 't-stat jammed open' fault code.

There did not seem to be any oil getting into the previous plugs.

My next guess would be either the MAF sensor or 02 sensors, but before I just start buying and replacing, does anyone have any advice? I read through other posts that have similar topics, but this is the best I can come up with. Is there something else I should test first?

Thanks

[Dmitry at Pelican Parts]

Hello - I'm attaching 2 DIY tech articles, one of the MAF sensor and one on the O2 sensor, to help you troubleshoot. Our other members will likely also chime in with input. Hope this helps a bit and best of luck!

BMW E46 Oxygen Sensor Replacement | BMW 325i (2001-2005), BMW 325Xi (2001-2005), BMW 325Ci (2001-2006), BMW 325ti (2001-2004) | Pelican Technical Article

BMW E46 Mass Air Flow Replacement | BMW 325i (2001-2005), BMW 325Xi (2001-2005), BMW 325Ci (2001-2006), BMW 325ti (2001-2004) | Pelican Technical Article