Just got repairs done at Nissan....smell burnt odor?

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SupaDupa1

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I just got a full tune up at Nissan for my Altima. Cracked exhaust manifold and o2 sensor bad, and both were repaired. Brake inspection was perfomed but nothing replaced or repaired. Drove it off the lot and 4 miles doan the road, I started smelling an odor like something was
burning like there was hot friction somewhere. It wasn't extremely strong, but a noticeable odor. Should I be worried?
BTW, I smelled it more potently from underneath the car when exiting??? o2 sensor or exhaust manifold needs to be broken in?
 
It is possible that there is factory crap or oil on or in the exhuast manifold, this is normal. However the o2 sesnor should have nothing to do with the smell, it could be. If it goes away in a few days it is probably just oil on the exhaust, but if it lasts longer than that get it checked out maybe that cat is overheating for some reason.
 
It is possible that there is factory crap or oil on or in the exhuast manifold, this is normal. However the o2 sesnor should have nothing to do with the smell, it could be. If it goes away in a few days it is probably just oil on the exhaust, but if it lasts longer than that get it checked out maybe that cat is overheating for some reason.
 
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