Cap stations have a 10 day ,1,000 mile guarantee on repairs.Did they change your 02 sensor?Maybe not a direct fit 02 that is not wired right.When you see the smog investigator make sure you tell him you did not ok that much money for repairs.Customer must be notified of the cost of extra repairs.
Did your car pass in the end?
Thanks
Rich

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88 300E White, sold 9-04
88 190E Black 2.3 sold
90 300CE White, Grey sold 12-24-04
92 400E White,Grey Sold 5-06
90 300CE 91K Signal Red,Black Sold 2007
1989 300CE Smoke silver,Tan Sold 1-08
1993 300E 3.2 M104 motor
1991 300CE White,Grey
1994 E420 beautiful car,gone to new home
1994 E320 Smoke an Parchment.Beautiful car