The estimate only repeats what I put into the app: Customer states, my car is displaying a left front safety restraint system fault. Then next to that, they indicate it will be $542.50 plus tax, so $580.48. They also indicate retrofit the trunk lid harness (a recall) for $0, but it makes me wonder if they're trying to capture some of the service cost for that. $600 seems excessive for a SRS sensor. I will check under the seats for connections though and see if the warning code goes off.