Thanks. I was about to do that myself. The codes (on pin 8 of the diagnostic box) are:
9 - 02 sensor voltage too high
11- 02 sensor heater amps too high/shorted
I've attached a pic of the connector under the passenger seat. Does anyone know what the pinouts for the heater connector are supposed to be? I get a continuty to ground on the brown wire, 96 ohms to ground on the black wire and 4 ohms to ground on the blue/green wire. As I mentioned, its an open circuit to the same blue/green wire on pin 7 of the fuel pump relay (where the heater is connected), even though that pin also has 9 ohms of continuity to ground.