The Smart Fortwo was designed to last. Whether gasoline or electric, this compact city car can easily exceed 150,000 km when properly maintained. But once it crosses the 100,000 km milestone, wear and tear start to show even on the best-built models.

Brakes, suspension parts, and electronics are some of the first systems to need attention. Knowing which components typically fail (and how to replace them affordably) can help you avoid unexpected repair bills and keep your Smart running efficiently for years to come.

In this guide, the EV and micro-vehicle experts at Ingenext outline the 10 most common Smart Fortwo parts to replace after 100,000 km, the warning signs to watch for, and how buying tested used OEM parts can save you up to 60%.

1. Brake Pads and Rotors

Why They Wear

City driving means constant braking. Over time, brake pads thin and rotors develop grooves that reduce stopping power.

Symptoms

• Squealing or grinding noises
  

• Longer braking distances
  

• Pulsation in the brake pedal
  
  

Replacement Tips

Replace pads and rotors together for balanced braking. OEM components ensure proper friction and performance.

Typical Cost Comparison

Ingenext inspects every brake component for thickness, corrosion, and heat warping before resale, giving you dealer-grade safety at half the price.

2. Suspension Control Arms and Bushings

Why They Fail

Rough roads and speed bumps gradually wear out the rubber bushings that connect the control arms to the frame.

Symptoms

• Clunking when turning or braking
  

• Uneven tire wear
  

• Steering instability
  
  

Recommendation

At 100,000 km, it’s wise to inspect all front-end suspension links. Used OEM arms retain Smart’s precise geometry and ride comfort.

3. Battery (12 V or HV for Electric Models)

Why It Matters

Even in EVs, the 12-volt battery powers electronics and startup systems. The high-voltage battery in electric Fortwo EQ models also gradually loses capacity over time.

Symptoms

• Dim lights or slow crank
  

• Error messages or failure to start
  

• Reduced EV range (for EQ)
  
  

Ingenext Advantage

Ingenext sells tested used 12 V batteries and certified high-voltage modules that meet OEM voltage and capacity standards verified with diagnostic tools.

4. Side Mirrors and Exterior Fittings

Common Issue

Parking in tight spaces means mirrors take damage: broken housings, cracked glass, or faulty motors.

Replacement Tip

Used OEM mirrors from Ingenext are cleaned, tested for electrical function, and come with intact paintable covers.

Cost Estimate

New OEM ≈ $350
Used OEM ≈ $140
Savings: 60%

5. Electrical Modules and Sensors

The Reality

After 100,000 km, some sensors begin to fail, particularly oxygen sensors, ABS sensors, and door lock actuators.

Symptoms

• Dashboard warning lights
  

• Reduced fuel efficiency
  

• Erratic electronics (windows, locks)
  
  

Why Used Makes Sense

OEM modules are reliable and easily testable. Ingenext runs each electronic part through a diagnostic bench test before listing it for sale.

6. Interior Trim and Seat Components

What Wears Out

Door panels, seat rails, and dashboard clips loosen from vibration and age.

Solution

Replacing with used OEM trim preserves factory fitment and look far better than low-quality aftermarket plastics.

Average Savings

50%–70% compared with dealer parts.

7. AC Compressor and Thermal Management System

Why It Matters

The AC system doesn’t just cool the cabin. In EV models, it also regulates battery temperature.

Symptoms

• Weak cooling or heating
  
  

• Clicking noises from the compressor
  
  

• EV overheating alerts
  
  

Ingenext Solution

Each used Smart Fortwo AC unit is pressure-tested, cleaned, and sealed before resale.

8. Wheels and Tires

Why They Need Replacement

Urban driving = potholes, curbs, and salt corrosion.

Inspection Checklist

• Bent rims
  

• Uneven tire wear
  

• Corrosion on bead seat
  
  

Ingenext Quality

Used Smart Fortwo OEM wheels are spin-tested for balance and inspected for cracks. Used tires are measured for tread depth and matched by brand and size.

9. Starter and Alternator (For Gas Models)

Common Problem

Frequent short trips and stop-and-go traffic shorten the lifespan of starters and alternators.

Symptoms

• Clicking sound when starting
  

• Dimming lights
  

• Battery warning light on dashboard
  
  

Cost Comparison

Ingenext tests every starter and alternator on bench rigs to ensure proper current output.

10. Exhaust System and Mounts

Why It Fails

Salt and moisture corrode exhaust pipes, clamps, and rubber mounts after years of use.

Symptoms

• Rattling noises underneath
  

• Strong exhaust smell
  

• Failed emissions test
  
  

Fix

A used OEM exhaust section can restore performance without the $1,000+ dealer price tag.

Bonus: High-Mileage Maintenance Checklist

At or after 100,000 km, Smart Fortwo owners should also:

• Change transmission oil or check for leaks
  

• Inspect suspension springs for cracks
  

• Replace cabin air and fuel filters
  

• Check rubber seals and weatherstripping
  

• Clean throttle body and intake
  
  

Ingenext can help source every part in this list: all OEM, all verified, all affordable.

Sustainability and Savings Go Together

Buying used parts isn’t just a budget decision. It’s an environmental one.

Each reused OEM Smart component prevents manufacturing emissions and landfill waste. Ingenext promotes sustainable automotive practices by refurbishing, testing, and re-certifying Smart Fortwo parts for resale.

Examples of Environmental Impact

• 1 used AC compressor = ~35 kg CO₂ saved
  

• 1 used wheel = ~20 kg of aluminum kept in use
  

• 1 reused module = zero new electronics manufactured
  
  

Why Buy Used OEM Smart Parts from Ingenext

Authenticity

All parts carry verified OEM serial numbers and are removed from genuine Smart Fortwo vehicles.

Testing

Each electrical, mechanical, and safety part undergoes multi-step testing for performance and reliability.

Transparency

You receive part numbers, condition details, and compatibility information before purchase.

Affordability

Save 40–70% versus dealer pricing without sacrificing quality.

Ingenext – Real Parts. Real Performance. Real Peace of Mind.

Quick Reference Table

Conclusion

Crossing 100,000 km is a milestone and an opportunity to give your Smart Fortwo some care. By replacing common wear parts with tested used OEM components from Ingenext, you extend your car’s life, save money, and protect the planet.

Whether you need brakes, an AC compressor, a mirror, or a suspension arm, Ingenext offers quality, authentic Smart Fortwo parts that fit perfectly and perform like new.