Tesla vehicles use both EP (6-point External Torx Plus) 

and EPR (5-point External Torx Plus, also called pentalobe or 5-lobe Torx Plus)  

for various repairs, depending on the component.Key Differences

EP sockets → standard 6-point External Torx Plus (similar to regular E-Torx but with Torx Plus profile).EPR sockets → specialized 5-point tamper-resistant version, not interchangeable with 6-point EP sockets (using the wrong one risks damaging the fastener).

Specific Requirements for Tesla Repairs Tesla commonly requires EPR 5-point sockets for:

Battery pack access (e.g., penthouse cover on Model 3/Y, perimeter bolts, retainers).

High-voltage electrical connectors. Bumper brackets and license plate fasteners (common on Model S and Model 3). Some suspension components, interior trim, door handles, and lights.

Common sizes include: 10EPR (very frequent for bumpers, connectors, and battery-related).

12EPR, 14EPR, 16EPR, up to larger like 28EPR or special EP8 for battery covers.

Standard EP 6-point sockets work for other Torx Plus fasteners in Tesla vehicles, 

but not for the tamper-resistant 5-point ones. Recommendations For most non-official repairs involving battery work, bumpers, or HV components, you need EPR 5-point sockets. 

Many aftermarket tool manufacturers produce sets specifically marketed for Tesla applications, 

emphasizing the 5-point design. Official Tesla service manuals do not publicly specify socket types in detail, but community and tool supplier evidence consistently points to EPR for these security fasteners.If you're working on a specific model/part, check the fastener head—5-lobe requires EPR; 6-lobe requires EP.