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how to tell if O2 sensor is Bad...



This is an 86 16V:
 
When I purchased my car it had about twice as much oil as it was supposed to have in it and it smoked like crazy, even had oil in the tail pipe, as well as oil film on all the windows.  Well I changed the oil and the car still smoked until the excess oil was burned away and now it runs awesome. 
    I just got TT race downpipe and exhaust and want to know if I should change my O2 sensor, the light in the dash does not come on and it idles good, but all the oil must have dome some damage to the O2 sensor...I can hear my cat rattling away, but it will be gone soon ;-)  
 
 
Thanks
Robert