98 355 F1 - OBD Code C0800 and/or C0816, anyone ever seen them?

I've searched both on here and Google in general, been through the generic OBD list and find nothing on C0816 and a only description of "Chassis - Device Power #1 Circuit Malfunction" on OBD-Codes OBD-II Trouble Codes - DTC Codes Car Repair

Need to get this thing inspected, and everything is running fine, no emissions codes, so it'll pass, but not with the damned CE light constantly coming on due to this annoying code.

I've never had both codes showing in the system at once.
Only saw the C0816 one time a month ago, it hasn't retunrned.
But the C0800 seems to be occurring every time I get the system back to ready mode.

I also have a P1448, which I'm in the process of swapping thermocouples and ECUs to verify (I have a Capristo with no 3rd bung, so my 3rd TC is in the ECU, but not plugged into anything, just tied up in the engine bay. I don't think the P and C codes are related, but figured I'd mention it.

 

I swapped the ECU and TC connections for both the ECUs on the right side of the car. Essentially trying to see if a different code pops up, indicating a bad ECU. Sure enough, now I'm getting a P1445 and a C0814. So it appears that amg55 is correct and the C code is somehow tied to the P code popping up.

I've got a new ECU on order (I have 2 greens on the cats, the 1 on the bypass that was throwing the 1448 is an old, black one) so we'll see if replacing that resolves the problem. I any case, I managed to get it inspected today since it isn't throwing any emissions codes and the ones in the system are still "pending" so no CE.

I just want all the codes gone for good... and also want to be able to chime in on the conversation of whether or not having the bypass TC "dangling" (actually tied nicely to the frame) and not plugged into the exhaust path (since my Cappy has no bung for it) does remedy the 1448 codes.

I'll update once the ECU is in and I swap all the connections back.

 

My bypass (Capristo) is working fine. Opens/closes as it is supposed to, so my 1448 code definitely isn't due to it being forced permanently open.

I'm pretty sure my black ECU is bad since hooking the right cat TC into it caused the code to change from 1448 to 1445. But yeah, I've seen mixed reports on getting rid of 1448 by tying off the TC. Since my Cappy exhaust doesn't have a bung I have no choice but to either remove it or "dangle" it. Either way I'd like to know if I can get rid of it or just have to live with constant CEs.

Thanks for your feedback. I'll update once the new ECU is in.

 

Thanks Bob. I'll give it a shot. I read through your recent epic thread dealing with your TCs/ECUs for pointers, so thanks for taking the time to document all of that.

And thanks again for getting me the TC recently. The PO had completely removed the original 3rd TC and it wasn't included in all the spare/original parts that came with the sale.