Ok so my car when accelerating past 4 rpm makes this weird noise like to much air is getting pushed out and it leaves a smell that smells like something is burning, I went to auto zone and got one of those free checks it came up as I needed a new o2 sensor, would that be right? I want to get it fixed but I'm also not trying to get ripped of because I don't know what it is. Any suggestions? Anything else it could be? It runs fine just has that problem.
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