Yep, your pipe-mounted exhaust temperature sensor signal isn't reaching the ecu, causing it to throw a code. I just changed my sensor after forgetting to torque down the sensor nut after reinstalling my pipe & it vibrated out and died. Check your wiring first to make sure its not a melt issue, and double check the two in-line connectors to make sure they're secure, but you've probably got a bad sensor. EZ fix but they cost $90 or more.
