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On the right hand side of the display there are 3 buttons. One info, one off and on and one info reset button. Hold down the up arrow on the info button, at the SAME TIME as the on off button. Hold it for approx 3 seconds. All the lights will light up for a couple seconds, then everything will go dark for a couple more seconds. The display will come back on as normal and display "ALL?". I highly recommend you have pen and paper and write ALL codes down. You should not ignore your engine light(s) or serious damage could result. After all codes display, it will ask you "ALL CLEAR CODES?". PLEASE research your codes though!

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Q: When the Service engine light comes on in a 2001 cadillac deville how do you check to see what turned it on and clear the system?
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