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So, I changed my air filter, managed to flood the engine while turning it on for a test drive since the car had been sitting a few weeks and the battery was low (it smelled of fuel like crazy when it started), and then next day noticed a check engine warning light. I didn't see the light the prev. evening during the test drive, it could've been already on or it could it not have been.

Torque Pro reported P0155 "O2 sensor heater circuit bank 2 sensor 1". Is that a O2 sensor or it's wiring? I was a bit rough with the thick rubber hose going from air filter box into the engine, I'm really hoping I didn't mess up the wiring.

Thanks.
 

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O2 heaters burn out with age.
It has nothing to do with your changing the air filter.
There is no fix: the O2 sensor must be replaced.
Things that come in pairs should be replaced in pairs.
Replace both the Manifold O2 sensors.

Don't bother with the pig-tail ones.
Get those with an electrical plug on the end.
 

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AfterThoughts:
If the O2 sensors are old, they may be very difficult to remove.

Treat the new ones very gently because they are delicate.
Put some high-heat anti-seize compound on the threads,
and keep it away from all other places on the sensor.
 

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My Spyder does the same thing if it hasn't been started in a while. I use my code reader and delete it. The warning light stays off..unless I don't start it occasionally. I'd try that before replacing the O2 sensor. I watch the live data and fuel trims are within normal limits after I drive it. But, that doesn't mean your O2 sensor hasn't failed.
 
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