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  2. sku: 12936207280800723
  3. DUCATI 40020171A

DUCATI 40020171A Speedometer Gauge Ecu Lock Set Ignition Key Switch

fits model: St4, St4s. make: Ducati. year: 1996–2003.

40020171a Ducati 2002 96-03 St4 St4s Speedometer Gauge Ecu Lock Set Ignition Switch Key

( Manufacturer Part Number: 40020171A ), ( Part Type: Ignition Switch Speedometer Gauge Ecu Lock )

Review DUCATI Speedometer Gauge Ecu Lock Set Ignition Switch Key fits ST4 ST4S 1996–2003

The **Ducati 40020171A (2002 2003 ST4/ST4S Speedometer Gauge ECU Lock Set with Ignition Switch and Key)** is a meticulously engineered aftermarket replacement assembly designed to restore full functionality and authenticity to Ducati 916, 916S, ST4, and ST4S models from the 1996 to early 2003 production years. This comprehensive kit includes a high-quality **speedometer and gauge cluster**, a **faulty ECU lock replacement**, and a **genuine ignition switch with key**, ensuring seamless integration with the bike s electrical system. Crafted to meet Ducati s exacting standards, the speedometer features a durable, analog dial with precise markings for RPM, speed, fuel level, and oil pressure, delivering the same crisp readability as the original while maintaining reliability under demanding riding conditions. The ECU lock set addresses common issues such as electrical shorts, intermittent connections, or failed locking mechanisms that can disrupt the bike s performance or trigger warning lights, providing a robust solution that enhances both safety and drivability. The ignition switch, paired with a matching key, ensures smooth operation of the starter motor, lighting, and electrical accessories, eliminating the frustration of faulty switches that can leave riders stranded or expose them to unnecessary risks. Whether restoring a classic Ducati to showroom condition or replacing worn components in a well-loved ride, this kit offers a turnkey solution that combines precision engineering with Ducati s signature craftsmanship, guaranteeing compatibility, durability, and the confidence of riding a bike that performs as it was intended.

### **Pros and Cons of Buying a Ducati 40020171 (2002-2003 ST4/ST4S) Speedometer, Gauge, ECU Lock, Ignition Switch, and Key Set**

#### **Pros:**

1. **Authentic Ducati Parts** The components are original or high-quality aftermarket replacements designed specifically for Ducati motorcycles, ensuring proper fitment and functionality.

2. **Enhanced Functionality** A working speedometer, gauges, and ECU lock improve ride safety and security. The ignition switch and key set ensure reliable starting and theft prevention.

3. **Compatibility** These parts are designed for the **2002-2003 ST4 and ST4S models**, meaning they should fit without modification if sourced correctly.

4. **Potential for Restoration** If the motorcycle is being restored, these parts can help bring it back to full working condition, increasing its value and usability.

5. **Aftermarket Support** Some of these components (especially gauges and ECUs) may have aftermarket alternatives that offer modern upgrades, such as digital readouts or tunability.

6. **Resale Value** A fully functional ST4/ST4S with all essential components intact is more attractive to buyers, potentially increasing resale value.

7. **Prevents Further Damage** A faulty or missing ECU lock or ignition switch could lead to electrical issues or theft; replacing them ensures long-term reliability.

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#### **Cons:**

1. **Age and Wear** Parts from this era (early 2000s) may show signs of wear, especially if they were removed from a used motorcycle. Rust, corrosion, or mechanical failure could be present.

2. **Limited Availability** Original Ducati parts for older models can be hard to find, leading to higher prices or longer wait times. Aftermarket options may not always match the quality of OEM components.

3. **Compatibility Risks** If the parts are not properly matched to the exact model year or variant (ST4 vs. ST4S), they may not fit correctly, requiring additional labor or modifications.

4. **ECU and Electrical Issues** Older Ducati ECUs can be finicky, especially if the motorcycle has had previous electrical work. A faulty ECU lock or wiring issues could persist even after replacement.

5. **Cost Considerations** While individual components may seem affordable, buying a full set (speedometer, gauges, ECU lock, ignition switch, and key) could be expensive, especially if aftermarket or restored.

6. **Key and Ignition Switch Reliability** Older ignition switches can wear out over time, leading to intermittent starting problems. The key may also be worn, requiring rekeying or replacement.

7. **Installation Complexity** Some of these components (particularly the ECU and wiring) may require mechanical or electrical expertise to install correctly, adding labor costs if not DIY-friendly.

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### **Conclusion:**

Buying this **Ducati 40020171 (2002-2003 ST4/ST4S) speedometer, gauge, ECU lock, ignition switch, and key set** can be a **wise investment** if the motorcycle is being restored or if these components are failing. The benefits in terms of **safety, functionality, and resale value** outweigh the potential drawbacks, provided the parts are **authentic, well-maintained, and properly installed**.

However, if the motorcycle is **already in poor condition** or the parts are **difficult to source at a reasonable price**, the cost may not justify the effort. Additionally, if the buyer lacks mechanical or electrical knowledge, professional installation could add significant expense.

### **Recommendation:**

- **If restoring or repairing the bike:** Proceed with purchasing these parts, especially if they are **original or high-quality aftermarket replacements**. Verify compatibility with the exact model before buying.

- **If the bike is running but needs minor upgrades:** Focus on replacing only the **failing components** (e.g., ignition switch or ECU lock) rather than buying a full set.

- **If unsure about installation:** Consult a **Ducati specialist** to assess whether the parts are necessary and how best to install them.

- **If budget is a concern:** Prioritize **critical safety components** (ECU lock, ignition switch) over cosmetic upgrades (gauges, speedometer) unless they are essential for functionality.

Ultimately, this purchase is **worthwhile for serious Ducati enthusiasts** looking to **restore or maintain** their ST4/ST4S, but it requires **due diligence in sourcing and installation** to avoid unnecessary costs or complications.

Details:

OFFICE USE: LTR-DH 02/26 02DUCATIST4-008595.

part #: 40020171a price

  • $449.99

specifications cycleswitches:

  • for models: St4, St4s
  • for makes: Ducati
  • for years: 1996-2003
  • mpn: 40020171a
  • part type: Ignition Switch Speedometer Gauge Ecu Lock

payments cycleswitches:

  • wallet: Paypal
  • cash
  • credit card: Visa
  • other

returns cycleswitches:

  • policy: Returns Accepted
  • paid by: Buyer
  • time: 30 Days

shipping cycleswitches:

  • class: Standard
  • cost: $0.00
  • carrier: UPS
  • transit: 3-7 Days
  • service: UPS Ground
  • type: Fixed

general cycleswitches:

  • Electrical Ignition Components > Electrical Ignition Sensors Switches > Ignition Key Switches
  • condition: Used

seller cycleswitches:

  • # reviews: 89543
  • rating: 100.0%
  • city: Anaheim, California

offer cycleswitches:

  • sold: 0
  • quantity: 1
  • options: Ship-to-home
  • started: February 18, 2026
  • availability: In Stock
for models: st4, st4s, for makes: ducati, for years: 1996-2003, part type: ignition switch speedometer gauge ecu lock,
category: auto parts > electrical ignition components > electrical ignition sensors switches > ignition key switches, sku: 12936207280800723,
Ducati 40020171A Is Similar To:
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1 offer $449.99 USD
  • Used. Offer #1 priced at $449.99 + $113.95 shipping estimate = $563.94* total. Wiring and plugs look in good shape. Ducati Sport Touring ST4S 2002-2003.+$113.95 shipping

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