Compatibility: 1999 Toyota 4Runner 2.7L Q&A: Q:What is Differences Between upstream and downstream O2 Sensor? .
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2PCS Up & Downstream Fits 2004-2005 Honda Civic 1.7L Air Fuel Ratio O2 Sensor
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?2pcs Up & Downstream For for 03-2007 Honda Accord 2.4L Air Fuel Ratio O2 Sensor
2pcs Up & Downstream Fits for 2000 Toyota Tacoma 3.4L Air Fuel Ratio O2 Sensor
