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IS300 O2 Sensors

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My mechanic is having trouble finding a rear (on the exhaust somewhere I guess) )2 sensor for my 2005 IS300. We have already tried a couple, but they don't fit.

Does anyone know of a source of sensors in Australia that may have a few options for the IS300?

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I think Bosch make them.  I called supercheap auto when my IS300 had a fault come up.  But that turned out to be a weak spark from the coils dying and making the cylinder run rich.  But new coils, spark plugs and leads and the fault went away.

Also the GS300 pops up a lot more in the parts catalog than a IS300 would, so that might help you out.

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