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Just replaced the bad exhaust Camshaft Position Actuator Solenoid Valve (Genuine GM part #12655421).

http://www.yourcobalt.com/forums/problems-service/94642-p0013-p0014-light-still-after-cmp-actuator-solenoid-valve-change.html

And then measured the resistance across the two pins. The new exhaust one reads 12.2 ohms, and the old intake one reads 13 ohms.

The question is: Do I also need to replace the old intake Camshaft Position Actuator Solenoid Valve while the exhaust one was replaced.

Thanks!
 

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Just did that and had same codes after replacing both camshaft sensors,fix was to replace variable timing solenoids valves intake and exhaust code gone and have not come back runs much better.note when took out badly gunked up so replaced both.
 
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