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|Connector Type:||Direct fit|
|Length (Sealing Surface To End Of Connector):||18.82 in|
|Thread Size:||M18 mm|
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Q:is this upstream downstream or does it matter, ?
A:The upstream sensor is the one closest to the engine while the downstream sensor is farthest from the engine. Your upstream sensor is the one that adjusts engine performance and the downstream sensor is getting info on emissions after the exhaust has gone through the cat. This Denso Oxygen Sensor Direct Fit with Part No. 234-4127 is an Upstream sensor only.