Anti skid and Check engine light ON - 2010 yaris

[romram]

Brought my yaris to Toyota service center, after the expensive diagnosed, they said it was a missed firing, and recommend to replace all spark plugs having number 3 some issues. So I paid $350 for the parts and labor ( hoping to deduct the diagnostic fee of $175 ).
After 6 days, the check engine light and slip indicator lights came back…
I don’t know if you guys had same issues.
Definitely Toyota service center didn’t help me thou. I called them up, and they said needs more hours of diagnostics $$$. Seems they don’t know what they are doing!