Smart #1 Brabus Mk1

The onboard charger on vehicles built between 2022 and Q3 2023 can fail to communicate with the wallbox, particularly with Gen 2-3 Tesla Wall Connectors and some other EVSE units. The car displays an error message and may refuse to charge via AC. The fix requires a workshop visit to replace the OBC module with a newer hardware revision. Under warranty this is free; out of warranty the combined part and labor cost runs between €1,500-3,000. DC fast charging typically remains unaffected.

Many Smart #1 Brabus cars built before June 2023 develop a pronounced humming noise between 65-90 km/h. The noise has been traced to faulty rear motor mounting bushes and in some cases vibrating rear axle components. Smart dealers replace the motor isolators under warranty. Out of warranty, parts and labor cost approximately €600-1,200 depending on whether additional insulation or bumper work is needed. The updated isolators fitted from mid-2023 production appear to resolve the issue.

The electrically operated flush door handles are a known weak point on early Smart #1 production. Handles may remain extended, close only partially, or fail to pop out entirely. Cold weather and moisture worsen the problem. Smart identified the issue as a batch defect and began fixing affected handles at ports before delivery, but cars delivered before this correction will likely develop the fault. Replacement of a single handle mechanism costs €150-200 in parts plus around one hour of labor. Multiple handles often fail in sequence.

The smartOS infotainment system, particularly on pre-update versions, is prone to freezing, spontaneous reboots, and complete audio loss affecting radio, phone, and even parking sensor sounds. OTA updates have progressively improved stability, but some owners report issues persisting after update 1.4. A dealer reset or forced firmware reinstall typically resolves persistent problems at no cost under warranty. Out of warranty, a diagnostic visit and software reset runs around €100-300. The Hello Smart companion app also suffers from connectivity issues, random logouts, and inaccurate vehicle location reporting.

The Smart #1 Brabus failed independent moose tests spectacularly, managing only 65 km/h before losing control with severe oversteer. ADAC testing confirmed limited driving stability in alternating curves. Smart issued a revised ESP software update from April 2024 via OTA that fully resolved the handling instability. Verify this update has been applied on any car built before 2024. Post-update, ADAC confirmed no remaining weaknesses. This is a free OTA update but critically important for safety.

A Brabus-specific issue affecting cars delivered through Q3 2023 where dealers failed to complete required pre-delivery motor and transmission preparation work. Affected vehicles can experience a sudden impact sensation from the front end while driving. The fix requires motor replacement in severe cases. This is a warranty item, but verifying that the pre-delivery work was completed is impossible for the buyer. If the car has been driven 20,000+ km without symptoms, the issue is unlikely to manifest. New part and labor cost runs €3,000-8,000 if out of warranty.

Like many modern EVs, the Smart #1 has parasitic 12V battery drain from always-on electronics. If left unplugged for 7-14 days, the 12V battery can drop below the threshold needed to wake the vehicle systems. A software update has improved sleep mode behavior, but some owners still report issues. Replacement 12V battery costs €150-250, or a trickle charger connection resolves the problem for cars parked for extended periods.