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Turner CTC testing provides mobile CARB Clean Truck Check testing services in Northern California. We are based out of Shasta County and serve the following counties: We serve 9 northern CA counties: Butte, Glenn, Humboldt, Lassen, Modoc, Shasta, Siskiyou, Tehama and Trinity. Our competitive pricing and mobile service sets us apart from our competitors. Reach out today to schedule a testing appointment for your commercial vehicle or motorhome today! - Currently, we only offer OBDII testing. Smoke Opacity testing coming soon!