A & D Automotive on Main Street in Chula Vista provides general mechanical repair covering engine diagnostics, brake service, cooling-system overhaul, and scheduled oil-change intervals for domestic and import vehicles. Engine-bay steam cleaning and undercarriage degreasing close out every major repair, a finishing step that keeps vehicles presentation-ready along the Main Street corridor shared with Soapy Joe's Car Wash. The shop's OBD-II scanner suite reads manufacturer-specific fault codes across Toyota, Honda, Ford, and GM platforms, enabling pinpoint isolation of emissions, drivetrain, and sensor-circuit failures before teardown. Brake service spans rotor resurfacing on an on-car lathe, caliper rebuilds, and ABS hydraulic-module bleeding for vehicles requiring DOT 3 and DOT 4 fluid specifications. Conventional and synthetic-blend oil changes follow OEM drain-interval maps, complementing the rapid-pit-stop fluid-change model at Jiffy Lube for drivers splitting routine maintenance between a dedicated mechanic and a quick-service lane. Highest-value repairs include timing-chain replacement and cylinder-head resurfacing on interference engines requiring crankshaft-to-camshaft timing verification within one degree of factory specification.