I just had my' 97 checked at a smog only station in the L.A. area. MY MB independent sent me to him. Although he had checked my same type car earlier in the day, he opened a large set up manual and reviewed the exact procedures for the car. This is important as there a big differences in testing.
The charge was $58. It took three tries to get the gas cap to pass, it must be a gotcha.
Ed