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I have a 2007 Tundra 5.7 TRD. I have had four incidents of check engine, stability lights, limp mode and changed the wiring harness.

This time I have the same lights but also a P2440 indicator. I don't see a chewed harness. How can I troubleshoot a secondary air valve. Can I just put a new solenoid on top of it?
 
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