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My wife and I drove this from Seattle to Vancouver B.C round trip, stay two nights, drove around in Vancouver, and still left some gas in tank when we got home. :D I drove 70 - 80 MPH, and get 42 MPG for this trip, way better than I expected. Plus, I believe Lexus has best quality ATM.

Bank 1 Sensor 1 is the O2 sensor ahead (towards the motor) of the catalytic converter. Underneath the car, you'll see two exhaust pipes. As the pipes come down from the engine, you should see a corded item (the O2 sensor) which screws tightly into the exhaust pipe. Then you'll see the catalytic converter, and then another O2 sensor, after the catalytic converter. The O2 sensors are "plug and play" meaning there is a clip that attaches to a wiring harness. For your 1998, the clip is underneath the carpet, by the gas pedal. You'll need to pull the carpeting up there, which means you'll need to remove the gas pedal. You'll see the clip. Unplug the clip from its receiving clip in the wiring harness. You can then unscrew the actual O2 sensor from the exhaust pipe underneath the car. It may be on there a little tight. You'll need an O2 socket wrench adapter, which is inexpensive, and fits on the end of your wrench. This tool allows room for the electrical wire. You can pick this up at Autozone, Napa, or where ever your favorite parts store is. As far as the sensor goes, use a Toyota / Denso sensor, which will have the correct electrical clip and voltage. No wire splicing required, and it's not that much more expensive. The immobilizer system is a security system for your car. It essentially disables the engine (immobilizes) so that it cannot be started, hot-wired, etc. It is the reason that the key fob is kind of expensive for replacement. As far as I know, replacement keys come from Lexus. You can get the exterior key fob, but the electrical gadget, with the buttons that open and lock the doors, only comes from Lexus. I bought mine from Sewell Lexus in Dallas. Hope that helps. Micah