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I changed my alternator recently and when i put everything back together the next day my engine light came on. I'm getting codes P0106 and P0661 which both have to do with voltage problems. Shown below. When putting back together everything is double checked and all sensors are plugged back in. help? did I get a faulty alternator?????

Code P0106 is triggered when your PCM sees that the voltage pertaining to the manifold pressure is moving up and down in an erratic way, and also doesn't see any corresponding change in engine load.

The P0661 code means that the PCM or another control module on the car has detected voltage from the intake manifold tuning valve control circuit that is lower than the automaker's settings.
 
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