Looking for smog repair mechanic in San Diego who knows 1996 Mercedes C280s well.
I had the same/similar issues in this thread.
I drove the cycle above several times. Also drove another recommended cycle several times. In total, I have driven the car over 600 miles. Many of the miles were driven attempting the drive cycles.

Two monitors will not reset, the air pump and the catalyst monitor. The smog tech said there might be an exhaust leak somewhere.

Any referrals are welcome.