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The oil pressure switch in located just above and to the left of the oil filter. It fits into the same housing as the oil filter and is parallel with the rear of the engine block, just look from underneath the car in front of the inner right CV joint and you should see it (or at least track down the wire leading to it). I know this because I just changed mine recently. You'll need to remove the inner right CV joint to gain the best access to change out the switch. All you have to do is remove the wheel, the brake caliper, and un-do the ball joint from the control arm. Next just tap out the inner CV joint from the transmission buy using a big screw driver on the groove of the joint to drive it out with a hammer. Be mindful of the transmission seal! Pull the CV axle out of the way buy removing the control arm from the strut, then move the whole assembly clear of the trans. The way I replaced my switch is by removing it with a pair of vise grips, I didn't worry about damaging the old one anyway. Just intall the new switch carefully with channel-lock pliers and a bit of sealer on the threads. Don't forget the washer that goes on the switch, and tighten the whole thing down snug and every thing else is reverse of removal.

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Q: Where is the oil pressure sender unit located on a 91 Pontiac Sunbird?
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