Quote:
Originally Posted by stumppy
Bad O2 sensors are a common cause of cars running rough and poor fuel mileage. $390.00 seems a little high for diagnosing and replacing one. It's possible that the O2 sensor on your car is hard to get to and requires a little more labor to get the job done though.
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http://wiki.answers.com/Q/How_do_you...s_IS300_bank_2
It's the sensor under the passenger seat near your Y pipe. (The IS has 4 sensors.....3 near the engine, and this one) Unscrew it (VERY hard to get off) then cut the wires. Splice the wires from a new one, solder, heat shring wrap it, disconnect battery to reset ecu, and you are good to go.