Oxygen sensor problem

hey my check engine light comes on and comes off sometimes, i ve run that operation, and it gave me code of 32 which is oxygen sensor or circuit right side
where s that sensor and what can be the problem?
is the sensor on the right exhaust? if so , then i had power steering fluid all ova that place due to crack in power steer hose, now its fixed...

so how can i check the sensor or fix it
what does it do???


Help ppl pls

Cheers, Sergi