97 Subaru Legacy Outback Oxygen sensor check engine light keeps coming back on after i replace it NE1 know Y?

it cost 70 bucks to have a shop hook up the computer to scan and reset that light or find out whats wrong, Before you do anything like that take the plug off your O2 sensor and put a multi tester in the plug, one hole at a time to see if there is a short.

You've just confirmed that many O2 sensor error code indications simply mean your engine has a performance problem that unbalances your air/fuel mixture ratio and makes it too rich or lean. The O2 error code does not mean you necessarily have a bad O2 sensor. The trained technician knows to test the O2 sensor and to diagnose engine misfires and related that cause an O2 sensor error indication. Professional auto technicians don't replace parts simply because they get an error code related to a particular sensor. However, if an O2 sensor error code indicates that the sensor's heater element is burned out, and the technician tests it and finds a burned out heater element, then he replaces the sensor. He also has test equipment for much more detailed tests to determine if the O2 sensor does not meet the manufacturer's specifications.

Obviously you can't have poblems with all sensors, I think what your sensors think it is true.