Fan cycling on/off & now Code P0420 catalyst...
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Honda-Tech Member
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Fan cycling on/off & now Code P0420 catalyst...
The fan for the A/C at the radiator keeps cycling on/off while driving with no A/C on and now the MIL came on with code P0420. I've read that a malfunctioning coolant temp switch, which also controls fan, could also cause that code? Any other advice please, I would like to TRY to fix myself so I don't have to go to mechanic... THANKS!
Honda-Tech Member
Joined: Feb 2018
Posts: 2
Likes: 0
Re: Fan cycling on/off & now Code P0420 catalyst...
The fan for the A/C at the radiator keeps cycling on/off while driving with no A/C on and now the MIL came on with code P0420. I've read that a malfunctioning coolant temp switch, which also controls fan, could also cause that code? Any other advice please, I would like to TRY to fix myself so I don't have to go to mechanic... THANKS!
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