Bellarinesbest

Hey guys, I’m new to the car scene and I recently purchased an XR6 turbo that’s been converted to manual, it use to be an na with a turbo engine put in and manually converted. It’s been throwing codes such as system comms fault, output shaft speed sensor, lack of heated oxygen sensor Now it’s throwing the etc code up and stalled on me? I’m not sure what to do as my best guess is to re-map the ecu??