How do you replace o2 sensor on 2001 Saturn l300?

Answer 1

1. Open the hood, look down at the exhaust manifold and find the device that looks a little like a sparkplug; it should be screwed into the exhaust manifold near the junction... that's the oxygen sensor.
2. Trace back the wire to a plug and disconnect it.
3. Unscrew the oxygen sensor. It's usually easiest if you have the specially designed socket, but it's not absolutely necessary.
4. SAVE THE WIRE!!! Most replacement oxygen sensors will require that you splice the wires from the sensor onto the wires of the original plug assembly.
5. AFTER you've spliced the wires, put the new oxygen sensor in place.
6. Now do the same to the OTHER side... the L300 has a V6 engine. A V6 uses 2 exhaust banks and 2 oxygen sensors. You'll save yourself a boatload of trouble if you replace them in pairs.