QUICK ANSWER FOR SMART OWNERS
Written by the YOUCANIC technicians in Towson, Maryland, from the UCAN-II Pro coverage database and our own shop work. Updated October 24, 2026.
A Smart is a small car with Mercedes-Benz electronics, and that is why a parts store code reader gets so little out of it. The coverage database behind the UCAN-II Pro treats Smart as part of the Mercedes family: the same module names (SAM, ESP, EDG and MEG engine control, instrument cluster), the same Control Unit Adaptations menu and the same Active Test list. It runs from the first fortwo 450 through the 451 that most US owners drive, the roadster 452, the forfour 454 and the 453 generation, including the electric drive with its battery management and onboard charger modules. Pick by what you need to do.
Reads and clears engine codes from your phone and gives you a live gauge dashboard. It does not see ESP, airbag, transmission, SAM or electric drive modules, and it cannot run an adaptation. Right if the only light you care about is the engine one.
Full system, bidirectional, lifetime free updates. Reads and clears every control unit, runs the Active Tests and the Smart Control Unit Adaptations: steering angle sensor calibration, service interval reset, VIN writing, transport mode, TPMS wheel electronics ID, DPF regeneration on the cdi. The tool to own if you keep a Smart running.
Same scanner, shipped both ways free, with a refundable deposit that comes back when the scanner does. For the one steering angle calibration, service reset or airbag code you need done once.
On the tablet you pick the control unit, then the function category, then the routine. Smart uses the Mercedes family categories: Control Unit Adaptations, Active Test, Oil Reset and Reading out the VIN. These are the routines the coverage database lists for Smart, grouped by the job you are doing. Names are as they appear on the tablet. Coverage varies by model and year, so check yours before you order.
| Job | Routines in the coverage database | Where it lives on the tablet |
|---|---|---|
| Engine and diesel aftertreatment | Adjustment of the injector injection quantities, Replace the component Diesel Particulate Filter, Regeneration of the Diesel Particulate Filter (DPF) when driving, Purge control Diesel Particulate Filter, Learning processes, Check the VIN in the control module | CDI and EDG control unit, MEG motor electronics › Control Unit Adaptations |
| Brakes and steering | Carry out calibration of steering angle sensor, Calibration of the Steering Angle Sensor (SAS), Activate regulation of vacuum pump for supplying brake system | ESP control unit › Control Unit Adaptations; ABS and ESP › Active Test |
| Electric drive | Unlocking of high voltage component lock, Locking of high voltage component lock, Carry out control unit assignment (SAM to Power electronics), active tests on Battery management system, Drivetrain control unit, Power electronics, Onboard charger 3kW and 22kW | Battery management system, Power electronics and Drivetrain control units › Control Unit Adaptations and Active Test |
| Service and body | Reset of maintenance interval display, Writing of maintenance interval display parameters, Service interval display, Oil reset, Control module reset, Writing of the VIN, Detach the transport protection, Activate transport mode, Deactivate transport mode, Voltage comparison, Special function Parameterization of vehicle equipment | Instrument cluster, SAM control unit, Central electronics › Control Unit Adaptations and Oil Reset |
| TPMS and tires | Write the wheel electronics ID number, plus active tests on the tire pressure monitoring control unit | Tire pressure monitoring system (TPM) › Control Unit Adaptations and Active Test |
Two vehicles pulled from the coverage database, with the control units the UCAN-II Pro lists on each. Every unit gets fault codes, live data and, where the database shows it, active tests and adaptations.
| Vehicle in the database | Control units | Examples of what it lists |
|---|---|---|
| Smart 453 (fortwo and forfour, 2016 on) | 37 | Motor electronics (ME30), Motor electronics (ME17_453), Transmission control (DCT453), Electronic stability program (ESP453 and ESP2_453), Supplemental restraint system, Instrument cluster (IC_EV453 and IC_ICE453), Electrical power steering, Air conditioning, SAM, Smart Media System, Soft top control, Driver side SAM, Smart Audio System |
| Smart roadster (R/C452) | 6 | Restraint systems control unit, Steering assist control module, ESP control unit, Instrument cluster, MEG motor electronics control unit, SAM control unit |
SCN coding of a new control unit, key programming, retrofit activation and anything else that needs a live connection to the Mercedes-Benz server are dealer jobs, and no aftermarket scanner does them. For diagnosis, live data, active tests and the adaptations above, which is what keeps a Smart on the road, the UCAN-II Pro covers it at one price with no renewal fee. Functions vary by class and year, so check your car or email support@youcanic.com with your VIN and the function you need before you order.
Yes. The fortwo 451 is in the Smart coverage database with the Mercedes family modules and adaptations. It plugs into the 16 pin port with no adapter.
Yes. Carry out calibration of steering angle sensor and Calibration of the Steering Angle Sensor (SAS) are listed in the Control Unit Adaptations, the routine that clears the ESP light after alignment or steering work.
Yes. The 453 lists the Battery management system, Power electronics and Onboard charger control units with active tests, plus the high voltage component lock and unlock routines. Confirm your year in the coverage checker.
No. Key programming needs the Mercedes-Benz server. The UCAN-II Pro does diagnosis, live data, active tests and the adaptations listed above.
Yes. The rental is a one week rental plus a refundable deposit that comes back when the scanner does, shipped free both ways. Most Smart renters want a steering angle calibration, a service reset or an airbag light cleared.
Use the coverage checker by class and module, or call 1-888-959-4265, Monday to Friday 9 AM to 4 PM Eastern, and a technician will tell you plainly. If it does not do what you need, we will say so. Every scanner also comes with 31 day returns, no questions asked.
Smart shares its electronics with Mercedes-Benz; see the Mercedes-Benz page. For other makes see the scanners by make hub, the service functions explained one job at a time, and the step by step repair guides on youcanic.com.
Dealer Level Diagnostics In Your Garage. One Price. No Subscription. The YOUCANIC UCAN-II Pro is a full system, bidirectional OBD2 scan tool w...
View full detailsThe Same UCAN-II Pro. Same Warranty. Same Lifetime Updates. $100 Less. An open box UCAN-II Pro is a scanner that came back to us, was tested o...
View full detailsRent The Scanner A Dealer Would Plug Into Your Car. $85 For 7 Days. One airbag light, one transmission adaptation, one no start you want to un...
View full detailsThe Gauge Cluster Your Car Should Have Come With, On Your Phone The YOUCANIC UCAN-GO is a Bluetooth 5.1 OBD2 adapter that streams live speed, ...
View full detailsFind Out Why The Check Engine Light Is On. In Your Driveway. For $20. The YOUCANIC UCAN-I plugs into the OBD2 port of any 1996 or newer car or...
View full detailsSee Inside The Engine Before You Take It Apart The YOUCANIC USB Videoscope is an IP67 waterproof inspection camera that plugs into your YOUCAN...
View full detailsBattery, Starter Or Alternator? Know In Two Minutes. The YOUCANIC Voltcheck Pro clips onto any 12 V or 24 V battery and tells you its state of...
View full detailsOne TPMS Sensor For Both Frequencies. Programmed By The Scanner You Already Own. The YOUCANIC U360 is a blank, universal tire pressure sensor ...
View full detailsNeed One TPMS Sensor And No Tool To Program It? Send Us The ID. We Ship It Ready. A dead tire pressure sensor normally means a trip to a shop ...
View full details
