The Experts Behind Your Vehicle's Safety
Every repair at Tri-Valley Automotive is supervised by owner Sofiane Zemmouche and executed by ASE-certified master technicians.
Sofiane Zemmouche
Owner & Master Diagnostic Specialist
Primary Specialty:
Advanced Engine Diagnostics & Shop Leadership
As the founder and hands-on owner of Tri-Valley Automotive, Sofiane brings over 18 years of technical mastery. He oversees every high-complexity diagnostic and repair to ensure every customer receives honest, dealership-surpassing auto care in Dublin, CA.
Certifications & Honors:
Marcus Vance
Senior European Automotive Technician
Primary Specialty:
BMW, Mercedes-Benz & Audi Diagnostics
Marcus specializes in complex European drivetrains, turbochargers, and electronic control systems. With extensive factory-level diagnostic training, he delivers dealer-grade precision for BMW ISTA and Mercedes Star diagnostic systems.
Certifications & Honors:
David Chen
Japanese & Hybrid Drivetrain Specialist
Primary Specialty:
Toyota, Lexus, Honda & Hybrid Systems
David is our resident expert on Asian import brands and high-voltage hybrid vehicles. From Toyota Hybrid Synergy Drive battery health checks to Honda V6 timing belts, David ensures maximum vehicle longevity and fuel efficiency.
Certifications & Honors:
Sarah Jenkins
Service Advisor & Customer Experience Lead
Primary Specialty:
Customer Care & Maintenance Scheduling
Sarah is the welcoming voice of Tri-Valley Automotive. She translates complex vehicle diagnostics into clear, actionable advice, keeping clients informed with transparent quotes and timely status updates.
Certifications & Honors:
Alex Rivera
Brake, Steering & Suspension Specialist
Primary Specialty:
Laser Wheel Alignment & Drivetrain Repair
Alex ensures your vehicle rides smoothly, quietly, and safely on California roads. He excels at precision 4-wheel alignments, performance suspension installation, differential rebuilds, and brake hydraulic systems.
Certifications & Honors: