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Had a Sony radio installed on my 2007 Jeep Patriot and now the check engine light is on and the car takes a while to start any ideas?
 

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I'd start with getting the codes read.

If you don't have a scanner, local auto parts stores (like Autozone) might be able to do it for you.
 

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Did you install a pass-through module with the radio?

And +1 what SandStone said. Best to check codes first to see if it's related or just coincidental. Remember that several systems may pass messages through the CANbus via the stereo module. Without a pass-through the computer may post a code
 
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