2istype

So I bought this 2007 Lexus IS350 which only has less than 70k miles, clean title back in August 2017 I sold my daily G37 X Sedan to get it. I drove to San Diego from Glendale, AZ to buy it. I've driven the car on long driving with no issues. It has been my daily with no issues.
Due to my super hectic schedule I haven't really done any maintenance on the car. It does need an alignment and the oil hasn't been change on it either. It's now coming to December since the past few days. Whenever I drive my car pretty hard, the air vents will release a rotten sewer smelly thing that I cannot describe like a stinky fart burning smell lol idk! It's not pleasant. I check for any valve cover leaks and there is none. What could it be? Btw I haven't replace the cabin filter either. Just for the record I've driven the car at high rpms to make sure the car is good when I bought it and it didn't emit that smelly odor in the beginning. This is my daily driver, my beater. I also have a Infiniti Q50S

Zmon

iTrader: (2)

You'll get a whole bunch of different answers on this. It's a combination of factors, it may or may not be just one thing. Cars driving history, gas used, maybe even some build up on the cat, etc. Some cars never exhibit this smell, some do. Brand new cars may exhibit it, while some don't. Could just be the cat being used. I don't smell it at all in my IS350 with 130k miles, but I notice a bit of a smell in my RX350. My brand new Yukon Denali also has that smell as well. As far as I can tell, it seems to be more common on the 2GR-FE versus our 2GR-FSE, though I've seen a fair bit of people ask here about it on their IS350's.

Gville350

iTrader: (10)

(5) SMELLS LIKE:
ROTTEN EGGS

WHEN: Any time your engine is running.

THE CULPRIT: Hydrogen sulfide in the exhaust, which is produced by trace amounts of sulfur in gasoline. It's supposed to be converted to sulfur dioxide in your catalytic converter. This may be indicative of a fuel-injection problem, and can be cured by a sharp mechanic. But often it means a failed catalytic converter. The bad news: A new cat is expensive. The good news is it's probably covered under warranty. Check with your dealer.

2grfan

I get a smell on occasion when I push it hard. I agree maybe cats. No CEL = no care.

2istype

I would hate to think its a fuel injector and yes the car is still under warranty so do I just call my local lexus dealer? And btw just to add and this is a very noob question. Do these cars indicate if the oil is low or not?

XSV

iTrader: (1)

If its still under warranty, take it to the dealership. Yes, the car has a low oil level sensor and "Low Oil" will pop up on the dash screen when if it happens.