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Need help diagnosing two codes. C0301 and P0401

   
Old Dec 7, 2023 | 09:20 PM
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Default Need help diagnosing two codes. C0301 and P0401
I have a 2010 Mazda 5 and it's got 128k miles on it. It just threw two codes.
  • C0301 - No known description.
  • P0401 - Exhaust gas recirculation (EGR) system - insufficient flow detected.
I can't find any decent information on C0301, seems it might be MAP sensor related. P0401 seems pretty conclusive that the EGR valve is sticking or failed.
I'm going to just bite the bullet and buy a new EGR valve, anyone any idea what C0301 might be?
 
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