Photo courtesy of Javier D. UPDATE - July 1, 2026: Important note. We no longer recommend buying the Gen4 ECU from any other sources except through Tesla because we have received many reports of unscrupulous sellers like on ebay who try to sell a package deal for a Gen4 ECU with a poor quality Bundle of Wires. We found out the Gen4 ECUs can be used (even though it is advertised as new), broken or misrepresented as the correct part number, and the Bundle of Wires can be of po