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Smart · Compact SUV · 2024–2026

Smart #3 HX31

Weaknesses, engine ratings and buying advice

★★★★★
3.0 / 5.0 · Based on 2 engine variants

Engine Overview

The Smart #3 HX31 is available with 2 engine variants — from 272 to 428 hp.

Brabus · Elektro· 428 PS
2024 2026
Be Careful 0 weaknesses
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Elektromotor · Elektro· 272 PS
2024 2026
Be Careful 0 weaknesses
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The Smart Brabus (Elektro, 428 PS) has the SEA-315 (Elektromotor Dual) — rated: "Be Careful".

The Smart Elektromotor (Elektro, 272 PS) has the SEA-200 (Elektromotor) — rated: "Be Careful".

Vehicle Weaknesses

WeaknessCost
!Software Instability: Profile Saving and Spontaneous Logouts

The vehicle software saves driver profiles (seat, steering wheel, mirrors) unreliably. Repeated spontaneous logouts from the user profile occur. The manufacturer describes many defects as 'series standard'.

Symptoms: Seat position and settings are reset after a journey, unexpected logout from the user profile
 Low
!Navigation System Fails Repeatedly

Since April 2024, Smart #3 owners have reported navigation failures. Traffic sign recognition deteriorated after the July 2024 update. No permanent fix available so far.

Symptoms: Navigation cannot calculate a route, stays offline, shows outdated charging station data
 Low
●Traffic Sign Recognition Unreliable

The traffic sign recognition incorrectly displays low speed limits on motorways. Partially worsened after the July 2024 software update. Persistent warning beeps until manually deactivated.

Symptoms: Wrong speed limits shown on display, recurring warning signals at permitted speed
 Low

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Known Problems and Issues

A total of 6 weaknesses have been documented for the Smart #3 HX31 (2024–2026). Typical issues affect Electronics, Other, Body, Interior.

What to watch out for with the Smart #3? See the detailed listing of all engine and vehicle weaknesses in the sections above.

Frequently Asked Questions

What problems and weaknesses does the Smart #3 HX31 have? +
No known weaknesses have been documented for the Smart #3 HX31.
What should I look for when buying a used Smart #3 HX31? +
faq.watch_a_none
Which engine is recommended? +
Be careful: SEA-200 (Elektromotor), SEA-315 (Elektromotor Dual). No engine is rated 'Good Choice'. The most fun to drive is the SEA-315 (Elektromotor Dual).
Which Smart #3 HX31 engine is the most fun? +
The {code} ({displacement}) offers the most driving fun in the Smart #3 HX31 — rated: "Legendary!". {description} 428 hp in the SUV coupé — the Brabus #3 combines sportiness with everyday usability. Brutal acceleration, around 400 km range.
Is the Smart #3 HX31 worth buying used? +
The Smart #3 HX31 requires careful consideration — choosing the right engine variant is crucial.
What horsepower variants are available for the Smart #3 HX31? +
The Smart #3 HX31 is available with engine variants from 272 to 428 hp.

Last updated: February 2026 · All information without guarantee