friendly_jacek I did some major maintenance (90000 miles) in my daughter's 03 Corolla and noticed very smelly, rich exhaust while idling and warming up. It wasn't like this 2 years ago when this was my daily driver. No CEL/MIL and everything works great otherwise. Car not abused and I'm maintaining this like before (= overmaintaining). I Cleaned MAF just in case. Anything else to try?