Ok. My original scan when I first got the car and CEL had a permanent, pending and confirmed 420,430.
I didn't clear the permanent codes using the BMW OBDII Drive Cycle since your last post. I did clear them with my scanner then though. The CEL stayed off for 243 miles but came on again driving the interstate yesterday. 420 and 430 again. Here is the report.
Diagnostic Report 2020-10-07.html.pdf
I don't have any rotten egg smell or rattling noises. The shop did report I have a small hole in my muffler if that would help cause the CEL?
So my report is saying I need pre 02 sensor which isn't normal to go bad at once, but since it does have 170k on it, probably bad since never changed before? I will buy just because of the age and I really think most everything else is fixed now, at least according to the scans? I think she has some life left in her, but than again I know almost nothing lol.
It does shift hard at random times. I am going to change transmission and transfer case oil with Valvoline MaxLife Multi-Vehicle full synthetic Automatic Transmission Fluid. If the fluid was bad tho, it should shift rough all the time, right?
I also would love to soundproof the engine cover without overheating the motor? Is that ok to do?