There are 2 of them (1 in each manifold) however and 2 after the cat.
Make sure you are replacing the right one.
You shouldn't try to clean them, it will most likely just contaminate the sensor and it will not work right.How much to replace 2001 bmw 330i o2 sensor?BEFORE U REPLACE IT DID U try some cleaner%26gt;?and yes labor on a bmw is easy but they like to kill u on the price just cause its genman i would do it ureself its pretty easy just take off the air cleaner tube and its on top of it and replace it just be careful id get one from ajunkyark cause they can get pretty expensive new they always give u a warrenty like if it doesent work bring it back or sumthing
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