After clearing the codes it varies as to how long it takes to return. Usually one to three drive cycles, sometimes I take it around the block once and it pops on. Sometimes I take it around the block three or four times and then it pops on. Style of driving doesn't seem to affect anything. And I agree this seems to be a deeper issue someone chased. I just wonder how deep can it be cuz man it sure seems to run and drive great. No odd smells, no smoking, it doesn't leak anything, no strange noises. Being a novice with BMW... From the outside you see a nice pretty car that looks very well taken care of on the inside and outside and a big fat stack of maintenance and repair records. And you think to yourself man this is a good buy somebody really cared about their car. And then you own it for a few days and you start seeing chinks in the armor..

I did see along with new downpipes and catalytic converters it got reman turbochargers installed last year as well. All this was done at a BMW dealership in Oklahoma called Jackie Cooper BMW

Before coming on here and asking the question I did quite a bit of exhaustive research on those codes and it said any number of things could be wrong with it. Vacuum leaks and exhaust leaks, spark plugs, oxygen sensors ,injectors, even saw one guy had a piston ring issue, you name it it was suggested that this code could be caused by it lol. That's why I ultimately ended up here hoping I could talk to some people that were experienced and maybe some have been there and done that