Oxygen Sensors Problem Cylinder Misfire

[Ikarah]

My mechanic had a look in there with a torch and said there is nothing in there, he said it looks like the previous owner deliberately hacked off the flap with a saw or something. The pin was also missing but we both looked in there couldn't find any parts..

[Ikarah]

Here's something I have noticed additionally. I have not yet replaced the DISA unit and I will I am just worried that this wouldn't solve my problem. So I want to give additional information. I have noticed that upon starting the car up and driving as long as I'm on D there is almost no misfires or vibrations or any sort of problems even if I'm stopped on D and holding down the brakes. For some reason if I put it in P after a short amount of time the rpm will start to fluctuate and the cylinders would begin to misfire. Could this still be DISA valve related? Thank you

[Ikarah]

Alright here's an update after the disa was replaced the misfire seems to completely has stopped been two days with no shaking coming back I guess it's fixed.

[Ikarah]

Alright, I checked the fault codes once more and this is roughly over a week after repair. I noticed three fault codes this time so the issue is really narrowed down at this point and it says that there is a voltage problem with the O2 sensor in bank 1, a cylinder misfire in bank 1 and a system too lean in bank 1. Then I decided I would monitor the O2 sensors on Torque. The voltage seems to be spiking constantly up and down for the O2 sensor in Bank 1 from between 0.2-0.9 but, for the other banks it seems quite stable. Please check the screenshot for O2 1x1. Could that sensor be busted?

Screenshot_2016-02-10-05-11-55.jpg

Thank you.

[Doge]

If you have a Bentley manual use the electrical diagrams and a digital multi-meter to trace the O2 sensor. Only reason I would say this is the PO did some questionable things what's to say that part of the O2 harness isn't grounding out or temporarily shorting? I seriously doubt this would happen but it could either be that, a bad sensor, or engine management.

[Afrantiq1]

e39 2002 BMW 530i code reading BC insufficient heat output, oxygen sensor before catalytic converter Bank 1. Coded EE misfire, cylinder 1 and FO misfire, cylinder 3. What specifically should I have repaired or addressed by my mechanic? Don't want a lot of unnecessary investigations or part replacements. Thanks

[Afrantiq1]

e39 2002 BMW 530i code reading BC insufficient heat output, oxygen sensor before catalytic converter Bank 1. Coded EE misfire, cylinder 1 and FO misfire, cylinder 3. What specifically should I have repaired or addressed by my mechanic? Don't want a lot of unnecessary investigations or part replacements. Thanks