ABS warning lights after catalytic converter replacement

It may not be the mechanic's fault, but damage that was missed when the thieves stole your CAT. Everyone was concentrating on the missing CAT and nobody did a full inspection of the undercarriage. Thieves could've done some damage when jacking up the car to steal the CAT, the shop could've damaged it when they jacked it up, or you could've ran over something that ripped down something down in the ABS system.

Good Luck.......

 

We need to start by asking the car what it thinks the problems are.

If you don't have a suitably-capable scan tool for doing that, then do this:

Blink (a/k/a Flash) Codes – How to. | PriusChat

Once we know what problems the car is reporting, we can reason about whether they were likely caused by the mechanic, or by the thief, or by something else.

Whatever the answer to that is, we will at least know what it is that needs to be fixed.