I live in Austin and own a 2001 LS 430 that I bought last year. For the most part, the car has run beautifully; credit to the gentleman that owned it before me.
I took the car in for a state inspection the other day and it failed it -- the fault code was P0135: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1). I do remember my mechanic (Bearden Automotive) mentioned a few months ago that one of my sensors was out and I should get it replaced if I wanted the car to pass inspection -- at the time, I (foolishly) ignored that.
I'd like to get this fixed but I'm trying to save as much money as I can on it. I think I remember being quoted about $350-365 to fix the problem by my mechanic. Is that within the ballpark of what others have paid? How hard would it be to replace the sensor myself?