Agustin's Auto Repair in Chula Vista has specialized in automotive electrical diagnostics and general mechanical service from its Broadway workshop since 1999. The electrical bench handles alternator rebuilds, starter-motor overhauls, and full wiring-harness diagnosis using oscilloscope-based testing, a complementary diagnostic tier above the routine fluid services at Valvoline Instant Oil Change. Speedometer calibration and instrument-cluster repair address both analog-gauge needle drift and digital-display failure across domestic and import platforms. Brake, suspension, and drivetrain work extends the service menu into general mechanical repair, with tire-and-alignment needs routed to corridor partners such as Pep Boys on Broadway. Diagnostic scans pull manufacturer-specific OBD-II fault codes through factory-protocol interfaces for Honda, Toyota, Ford, and GM platforms, isolating intermittent electrical faults that generic scanners miss.