2021 Tesla Model 3 Key Fob Programming Guide
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
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Quick reference
| Item | Detail |
|---|---|
| FCC ID | 2AEIM-1049973-00-A |
| OEM Fob PN | 1049973-00-A |
| Aftermarket Options | See below |
| Battery Type | CR2032 |
| Programmable On-Board? | Yes |
| Cuts Required? | No |
Step-by-step on-board programming
The 2021 Tesla Model 3 utilizes a straightforward on-board programming procedure for its key fob, meaning you can program additional fobs yourself without needing specialized tools or a trip to the dealership.
- Ensure your Tesla is in Park. The vehicle must not be in motion for the programming process to begin.
- Open the Tesla app on your smartphone. Make sure your phone is already paired with your vehicle.
- In the app, navigate to Security.
- Locate and tap on Keys, then select Add New Key Fob.
- The car's touchscreen will display instructions. You'll be prompted to place the new key fob on the center console behind the cup holders, on the designated key card reader.
- Place an already-paired key card or key fob on the same spot on the center console to authorize the programming of the new fob.
- Follow any additional prompts on the touchscreen. Once the process is complete, the new key fob should be recognized by your Model 3.
Battery replacement
The Tesla Model 3 key fob uses a CR2032 coin cell battery. Replacing it is a simple process:
- Locate the small indentation on the side of the key fob. This is where you'll insert a small screwdriver or a plastic pry tool.
- Carefully pry apart the two halves of the key fob. Be gentle to avoid damaging the internal components.
- Remove the old CR2032 battery. Note the orientation of the battery (which side is facing up) before removing it.
- Insert the new CR2032 battery with the positive (+) side facing up.
- Snap the two halves of the key fob back together until you hear a click. Ensure it's securely closed.
Where to buy a replacement fob
When it comes to replacing your Tesla Model 3 key fob, you have a few options, each with its own pros and cons:
- Tesla Service Center: This is the most straightforward option, ensuring you get a genuine OEM part. However, it's typically the most expensive. Expect to pay $175 - $225 for the fob itself.
- Online Retailers (e.g., Amazon, eBay): You can find both genuine OEM and aftermarket key fobs online. While often cheaper, be cautious about the authenticity and quality of aftermarket options. Always verify the FCC ID and part number. Prices can range from $50 - $150 for aftermarket and $150 - $200 for OEM (if you can find them).
- Locksmiths: Some specialized automotive locksmiths may be able to source and program Tesla key fobs. Their pricing can be competitive, often falling between that of online retailers and the dealership. Call around for quotes.
Since the Model 3 has an immobilizer system integrated with its key system, and programming is handled through the vehicle's software, aftermarket fobs need to be specifically designed to integrate with Tesla
More specs for the 2021 Tesla Model 3
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Same spec — other model years
Maintenance & repair guides
2021 Tesla Model 3 Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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