I have a bizzare problem with my 2000 Legacy Outback Wagon. The check engine light comes on sometimes for days, then goes out, sometimes for days, then comes back on, etc. I had the codes checked and the indication was "defective heater element, front 02 sensor. I replaced it...same ol' shit. Same code. Sometimes CEL is on, sometimes it's off. Clear the codes, same one comes back.
Ideas?