Subaru WRX STI/ Universal Rear O2 Sensor Spacer  E-mail this product to a friend previous | up | next  This part can be installed in your exhaust in order to pull your rear O2 sensor about 1cm further out of the exhaust flow.  The sensor will see less exhaust gas, and can help to turn off Check Engine Lights thrown when you put on an after-market catalytic conver on your car.   The thread pitch is M18 X 1.5 and the internal diameter of the spacer is 12.8mm SKU: O2-EXTENDER Weight: 1.00 Price: $16.95  Quantity:

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