Below is what I found a couple years ago when I first got my 2005 fortwo [aka 450]. As I understand it, one wrench means "A" service is required and two wrenches mean "B" service is required. The system uses time and mileage to calculate which is required. Any independent Mercedes garage w/ "Star" computer system should be able to reset, that's how I have had mine reset. If you are in Los Angeles area I recommend Stepke Imports independent Mercedes service in Mar Vista.
Stepke Imports, your Mercedes Benz Repair Specialists!
Intervals
1st service A at 9,000 miles or 1 year (which ever sooner)
2nd service B at 18,000 miles or 2 years (which ever sooner)
3rd service A at 27,000 miles or 3 years (which ever sooner)
4th service C at 36,000 miles or 4 years (which ever sooner)
Service intervals
A, B, A ,C, A, B, A ,C, A, B, A ,C
Service Inspection 'A'
Checks and inspections:
Read ECU for faults
Conduct a visual inspection of the brake lines
Test smart on dynamometer
Check:
Lights and indicators
All electrical additions
Wipers
Seat belts and buckles
Expire date on tire seal (if available)
Battery fluid level
Condition of tires and wheels
Tire pressures
Windscreen washer fluid
Brake fluid level
Underside of smart for signs of damage
Engine for leaks
Exhaust does not leak and isn't loose
Transmission oil and look for leaks
Condition and tension of V-belt
Coolant level
Antifreeze concentration in coolant
Axle shaft collars for damage
Rubber bearings and joints for damage
Amount of travel in handbrake
Brake pads for wear
Brake discs
Wheel mounted brake cylinders on front axle
Steering mechanicals
Work carried out:
Oil change
Oil filter change
Oil hinges and locks
Tighten wheels to correct torque
Check tire pressures
Top up fluids:
Battery
Windscreen washer
Brake fluid
Coolant/antifreeze
Service inspection 'B'
Checks and inspections:
Read ECU for faults
Conduct a visual inspection of the brake lines
Test smart on dynamometer
Check:
Lights and indicators
All electrical additions
Wipers
Seat belts and buckles
Expire date on tire seal (if available)
Battery fluid level
Condition of tires and wheels
Tire pressures
Windscreen washer fluid
Brake fluid level
Underside of smart for signs of damage
Engine for leaks
Intercooler
Exhaust does not leak and isn't loose
Transmission oil and look for leaks
Condition and tension of V-belt
Coolant level
Antifreeze concentration in coolant
Axle shaft collars for damage
Rubber bearings and joints for damage
Amount of travel in handbrake
Brake pads for wear
Brake discs
Wheel mounted brake cylinders on front axle
Steering mechanicals
Work carried out:
Oil change
Oil filter change
Oil hinges and locks
Replace air filter
Replace spark plugs (petrol only)
Replace key batteries
Tighten wheels to correct torque
Check tire pressures
Top up fluids:
Battery
Windscreen washer
Brake fluid
Coolant/antifreeze
Every 2 years or 20,000 miles (charged separately)
Replace brake fluid
Check body for paint damage and rust
Service inspection 'C'
Checks and inspections:
Read ECU for faults
Conduct a visual inspection of the brake lines
Test smart on dynamometer
Check:
Lights and indicators
All electrical additions
Wipers
Seat belts and buckles
Expire date on tire seal (if available)
Battery fluid level
Condition of tires and wheels
Tire pressures
Windscreen washer fluid
Brake fluid level
Underside of smart for signs of damage
Engine for leaks
Intercooler
Exhaust does not leak and isn't loose
Transmission oil and look for leaks
Condition and tension of V-belt
Coolant level
Antifreeze concentration in coolant
Axle shaft collars for damage
Rubber bearings and joints for damage
Amount of travel in handbrake
Brake pads for wear
Brake discs
Brake drums
Wheel mounted brake cylinders on front axle
Steering mechanicals
Work carried out:
Oil change
Oil filter change
Oil hinges and locks
Replace air filter
Replace fuel filter
Replace spark plugs (petrol only)
Replace key batteries
Tighten wheels to correct torque
Check tire pressures
Top up fluids:
Battery
Windscreen washer
Brake fluid
Coolant/antifreeze
Every 2 years or 20,000 miles (charged separately)
Replace brake fluid
Check body for paint damage and rust