[DieselSJ]

Originally Posted by Mattchu60

A Heated O2 Sensor can heat itself, while the stock O2 sensor relies on the engine heat to heat it up.

You said someone put dual exhaust on - did they remove the factory manifolds and replace with headers? I ask because the 02 Sensor goes into the manifold, not the Y-pipe. If you still have stock manifolds you should have a port for the 02 sensor.

Just to add a bit more detail...

The heated sensor will also get the system into closed loop faster, which can have a positive impact on mileage. If the O2 has been moved downstream from the manifold, such as into the Y-pipe, then a heated setup is almost mandatory as there isn't enough heat left in the exhaust to get the O2 to work reliably.

I converted mine to a heated setup although I still have stock manifolds. Super easy to do. Heated sensor has 3 wires - one goes to the stock wire in the harness, and the other two are power and ground. Just use a keyed power source.