July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Upstream

1. Disconnect the battery ground cable.
2. Disconnect the electrical connectors from the upstream Heated Oxygen Sensors (HO2S).
3. Use Oxygen Sensor Wrench T94P-9472-A or equivalent to remove sensor(s) from exhaust manifold(s).
4. Reverse procedure to install. Tighten sensors to 30-49 Nm (22-36 lb ft).