This flying lead oxygen sensor is made by the original equipment manufacturer for Toyota and Lexus, Denso.  With this affordable flying lead sensor, you can replace your failing Lexus IS300 primary or catalyst o2 sensor for a fraction of the price than a dealership or even online generic Plug and Play replacement costs.  Simply re-use the harness from the old sensor that was going to be thrown out!!  Includes instructions (wire color code matches stock/OE wires!) special crimps, heat shrink and anti-seeze!!!!!

Primary oxygen sensors that have faults or simply too much wear from milage can cause a variety of OBDII check engine lights, incuding the following codes: P0130, P0131, P0132, P0133, P0134, P0135, P0136, P0137, P0138, P0139, P0140, P0141, while bad post cat sensors can through the codes: P0036, P0037, P0038, P0054, P0136, and many many more.  See the attached picture for o2 sensor placement and the codes that they address!

Taken from "Brake & Front End", August 01, 2005 by technical editor Larry Carley--

"If a vehicle with a sluggish O2 sensor is only averaging 18 mpg, and is driven 12,000 miles a year, replacing the sensor can save $100 or more a year in fuel bills if the new sensor improves fuel economy 10 to 15 percent (which it often can). It's not a big savings, but there are other benefits, too. As we said earlier, bad O2 sensors are a major cause of emission failures. Bad O2 sensors are also a leading cause of catalytic converter failures.

Replacing O2 sensors for preventive maintenance, therefore, is something you should recommend not only to restore peak fuel efficiency and to minimize exhaust emissions, but to also prolong and protect the life of the converter."