Mods: Cone filter mod
Mileage: 12,5xx
Hightlights:
- Car was working fine last night
- Warmed up car in the morning
- 9 hours later I go to the mitsu dealer to find out what the SES is
- Tech pulls the code and its B3813 Undefined Code, he clears the code
- Light has not come back on yet

Last night my car was working fine nothing wrong with it. This morning, I turn my car on to warm it up while I get ready. I get in the car and the Service Engine Light is on. I go to work. 4 hours later, I go to lunch and my SES light is still on. After work, I took off the cone filter and put back the stock airbox hoping it would clear. It still was there. Drove to mitsu dealership to see if they could check it. The tech pulls the code and gives me a B3813 Undfined. He said he needs to schedule an appointment to actually find out what's wrong. He asks me if I want him to clear the code. I tell him to go ahead. I leave the dealer to go to school, which is 30 min away. The SES light is still off. I'm at school for a good 4-5 hours. I hope the light doesn't come back on when I leave. I'll keep you guys updated. Anyone have an idea what B3813 Undfined code is? Thanks.

 

If the dealer says it's undefined, it most likely really is. I scan and get undefined codes all the time from different vehicles (like the infamous 1187 with Ford Probes that make me want to strangle someone).

 

so should I worry about it coming back on? or worry what it was?

 

I would let the dealer run their course with diagnostics. It might turn out to be erroneus or something mitsu decides can be taken care of by reflash, but it could also turn out to be something important. That's the nature of undefined codes, it will just take some time in diagnosis to find out.

 

You have a PM...