Tesla Model 3 (2018) OBDII Adapter – HRN-CT20T1


Please note: This adapter is for 2018 Tesla Model 3s ONLY. If you are looking for an adapter for the 2019 or newer Model 3, please see here


The HRN-CT20T1 is a Tesla Model 3 OBDII adapter to connect to the Tesla diagnostic port, or Tesla OBDII port for 2018 vehicles only.

Tesla Harness Install Video

If you are looking for a Tesla adapter for the 2019 Tesla Model 3 or newer, you need to purchase the HRN-CT20T11.

Length: 30 cm / 12 inches
Max length of connected cables: 2 meters / 6.5 feet


Other Tesla engine diagnostic port adapters:

2012-mid 2015 Tesla Model S OBDII Adapter
Mid 2015+ Tesla Model S OBDII Adapter
Tesla Model X OBDII Adapter
2019+ Tesla Model 3 and Model Y OBDII Adapter
Overview of Tesla OBDII Adapters
Geotab Features for Electric Vehicles

Tesla Forum

Additional information

Weight 0.5 lbs
Dimensions 6 × 6 × 2 in