What is your driving style? My father in law had an Olds Aurora that he dearly loved but always had problems with... it started smelling of fuel on cold starts in the morning and throwing no codes, ever, on inspection the dealer told him that it all it really needed was “blown out” that condensation was puddling in the exhaust in the evening because it wasn’t getting driven “hard enough” or long enough. Long story short he was a 63 in a 65 mph zone and took 5 minutes to get to that 63 mph and worked 3 miles from home... so, the next time they visited I showed him what the dealer meant by “blown out” and his problem was gone for the better part of a month before his particular driving style, in that particular car (because he drives everything the same way) came back...
If you’re not getting codes and haven’t noticed any significant change in the performance of the car, maybe just give it a good spirited run up the freeway and see what shakes out.

Much more diagnostic can certainly be done after that if / when needed.


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