Hey Lance,Hi Op,
I have a 99 540 with the exact same symptoms and codes. From the research I have done, I am leaning towards the throttle body gasket first, which I have already purchased, just haven’t had the time to replace it yet. If anything, the throttle body gasket is the cheapest of the parts referenced above, which is where I like to start anyway.
Anyway, I guess all that to say it would be very appreciated if you could update this post with the results from whatever route you choose.
Thank you in advance,
Thanks for your reply. Although I’ve narrowed it down to many different causes, I still have not come to a final conclusion. I’ll definitely update this thread once I’ve determined what it is and the issue is resolved. Hoping it’s done this weekend...