OBD II Code Help

Tasty

Member
:
2003 Protege5
Anyone have any experience with this code?

P0031: Voltage signal for 02 sensor 1 heater control in bank 1 is too low.
 
i have a full diognostic file that has every code,possible causes and solutions that would help you out but its too big to upload so if you want PM me your email and i can send it that way.sorry i cant help out now.
 
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First, do you have any mods? such as a header or other exhaust work?
 
Only thing under the hood is a CAI. I checked the plug to O2 sensor #1 last night (which I couldn't get disconnected) and noticed that the breather tube from the CAI to the valve cover was disconnected. I think I forgot to hook it back up when I took everything off to clean the EGR the other night. I wonder if that could have triggered it? I kind of doubt it.
 
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