Given both those codes happening at once, first guess would be the connection to the Lambda probe has broken/come unplugged. I've seen some pretty nasty attempts at cheap DIY probe replacement...so start there as the cheap replacements usually require you to splice the wires 'cos they don't come with the connector. Probe itself will be in the exhaust, before the CAT, lead coming out of it, follow the lead to the loom. Don't have a TS so can't say more than that.
Don't get me wrong, I've used the cheap generic probes myself and they've working fine for me, but you need to do a half-decent job of splicing the wires.
Second guess would be my personal favorite, blown fuse on the Lambda heater circuit.
Third guess, all manner of relay and wiring related possibilities.
All the above are DIYable.