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Q: Main Engine Relay.... on 2005 Nissan Frontier

I have a 2005 Nissan Frontier SE w the 4.0L V6. Truck wouldn't start and when it would it would sputter at best, i ended up having to replace the main engine relay. Runs fine now but 2 days after replacing it then "service engine soon" light popped on and has been on for 2 more days now. Gonna get it checked out, didn't know if anyone can add onto this for me. Maybe it only needs to be reset? Thank you..
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no, the light comes on for a reason. you need a real shop to do a real diag to see where the failure has occurred. get back to us with the code number and we can help more.

Ok i found out the code for my check engine light... P0430. Any help on this would be appreciated! Thanks..
that is a cat converter code. if it is clogged, it will not start. otherwise it is just worn out. a cranking vacuum test will tell if it is clogged.

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