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Re: p1406 on 97 GA 3.1L
The position and flow sensors are all in the same unit. EGR flo must be o.k. since no p1401 code. All you can check is the harness. 12v at the pink, 5v PCM reference on one of the greys and the brown is EGR position to PCM.
Just sounds like you have 2 bad valves.
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