Quote:
Originally Posted by Drift_Marti
Back of the engine under the throttle body on the drivers side. That plug is for the oil gallery. The other one is a knock sensor. Do not remove the knock sensor. A good quality sandwich plate shouldn't leak
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I thought it was a factory oil sensor, comes up with a red light if it detects a problem, 99% sure I've seen several guides explaining how it can be used for fitting an after market oil pressure sensor and you just tuck the factory sensor to one side.
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DEFI BF install -Step by step with pics - 24 May - INSTALL COMPLETE - Subaru Impreza WRX STI Forums: IWSTI.com