Where is the oxygen sensor on a 2000 outback legacy?
It's underneath your car. Off the exhaust pipe.
Not sure what you are seeking. Subarus use a valet key that will unlock only certain locks. You should have an owners manual for your car that will answer that and many other questions. Subaru has free manual downloads on their web site but only back to 2000. An electronic copy is available for your '99 on eBay for about 4 bucks, printed ones command a somewhat higher price. The Legacy manual covers the Legacy…
It is located on the muffler by the moter and looks like a sparkplug with wire attached at the end. To be specific, my 2000 Durango has 1 upstream oxygen sensor and 1 downstream oxygen sensor. Both are located on the exhaust pipe. The upstream is between the engine and catalytic converter. The downstream is located between the catalytic converter and muffler. - Mick