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I went through the same issue with my 2.5L... First off is the oil sending unit the same as oil pressure sensor? Mine was coming on while at an idle and when you gas it the light would go away.
I went ahead and had a shop check the oil pressure and it was fine (oil level was fine too of course) despite the dash light going on... so I picked up a spare sensor and was trying to pull it off until I realized there are special oil sending unit sockets you have to buy... so I went back and I just reseated the connector to the sensor and ever since then, the oil pressure light hasn't come back to haunt me. FYI be careful pulling off the connector as it was really brittle and I busted the tab on mine.
Perhaps the issue with the oil change connection is someone smacked the sensor with a rachet? Happens all the time on the mr2 where the O2 sensor is literally 2 inches away from the oil filter...
Thanks - HB
96 JXI Sebring w/110k
96 Camry
01 Tacoma 4x4
91 MR2 Turbo
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