Diamond SmogWrite a Review909-869-5856Be the first to review!1267 Brea Canyon Rd, Walnut, CA 91789Hi there!Be the first to review!5First-class4Better than most3About what I expected2Not the worst...1DisappointingClick to RateMore Business InfoHoursDo you know the hours for this business?CategoriesAutomobile Inspection Stations & Services, Emissions Inspection Stations Suggest an Edit