so my 02 is stuck and im too lazy to take it to the shop and pay $30 for them to loosin it. i was wondering if i can cut the original one, get a universal o2 and splice it into the oem wiring. will it cause it trouble to the ecu?

 

yes. never cut and splice an o2 sensor or any other wire providing information directly to ur ecu. High posibility of giving ur ecu false readings.

 

so what happens if you have a bad o2? or how do you replace a bad o2?