I have a 2014 Ford Fusion SE. The engine light came on other day & the code read P2196 (O2 sensor), the light went off that afternoon. A couple of times since it makes this "bumblebee" noise in the left rear (like a crotch rocket or modified car) . It does it for about 1-2 seconds every few mins, no real pattern to it...I've been in motion, parked, slowing down, etc. & the engine light is not on when it happens. If I shut the car off & restart after the noise happens, the engine light comes on & the noise no longer happens. Would this be something besides O2 sensor?
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