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I have a Cadillac CTS 2005 with 172,000 miles on it. I started it the other day and and my engine light started blinking and I used a scan tool to diagnose the problem. I scanned it and got
P0203 Injector Circuit/Open Cylinder 3

I already changed the fuel injector and put everything back together and I still get the code P0203. The wire and the connections seem intact and in pretty good shape? What else could it be?
 
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