I'm throwing a few SES codes. P0135, P0141, P0155, & P0161. It looks like Pre & Post Cat O2 heat codes. It started after recent tune update. Is it OK to drive my truck until I get my tune updated or should I throw the old PCM back in for now? BTW - Truck is running real good. Probably too lean?

 

The problem is that you may damage the converter(s) if the O2's don't read correctly and you stay in open loop. I would say easy shorts trips would be ok...assuming you aren't super/turbo charged.

Dave