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Q: my ck enging lite is on .i have put a new catv on and a new flex pipe.also a new on 2002 Buick Century

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water pump ,i dont think is the intake manifold gasket cuz egine runs perfact.
(2) Answers
(2) Comments
Have it scanned at a shop not a parts store .The code(s) will tell you what system(s) are affected and help lead you to the proper fix. If the exhaust repair (catv?/flex pipe) is near an oxygen sensor , check for leaks , even a small one can affect it's readings causing the MIL to illuminate.(MIL= malfunction indicator lamp)Good luck.