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Smog Check & Emissions Testing Stations in St Charles, MO

6 of the 58 auto repair shops we list in St Charles have smog checks or emissions tests.

Not every repair shop is licensed to test emissions, and a map search for a smog check mixes test stations with parts stores and dealerships. Every station here names smog checks or emissions testing in its business name, its listing category or on its own website.

  1. LTS Automotive - a Main Street Auto shop

    923 1st Capitol Dr, St Charles, MO 63301

    Mon–Fri 7:30am–5:30pm, Sat closed, Sun closed

    Smog & emissionsState inspectionTransmission repairEuropean & importA/C repairFinancing
    Call Website Directions

  2. Ace Tire & Auto Services

    1761 S River Rd, St Charles, MO 63303

    Mon–Fri 8am–5:30pm, Sat 8am–1pm, Sun closed

    Smog & emissionsState inspectionA/C repairBody & collision
    Call Website Directions

  3. Affordable Automotive Care and Tires

    3425 New Town Blvd, St Charles, MO 63301

    Mon–Thu 8am–5pm, Fri 7am–4pm, Sat closed, Sun closed

    Smog & emissionsState inspectionDiesel & truckA/C repair
    Call Website Directions

  4. Coffey Automotive

    2060 Exchange Dr, St Charles, MO 63303

    Mon–Fri 8am–5pm, Sat closed, Sun closed

    Smog & emissionsState inspectionTransmission repairDiesel & truckMuffler & exhaustA/C repairFinancingLoaner or shuttle
    Call Website Directions

  5. AAMCO Transmissions

    3625 Harvester Road, St Charles, MO 63303

    Smog & emissionsState inspectionTransmission repairA/C repairFinancing
    Call Website Directions

  6. CAL Automotive

    2727 Veterans Memorial Pkwy, St Charles, MO 63303

    Smog & emissionsState inspectionTransmission repairMuffler & exhaustA/C repair
    Call Website Directions
Bring your registration renewal notice. States that require emissions testing usually print the type of test on it. In California, a notice that says “STAR station required” means only a STAR-certified station can do the check, and test-only stations check cars but do not repair them.

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Smog Check & Emissions Testing Stations near St Charles

Good to know

How much does a smog check cost?

Prices depend on the state and the station. In California a smog check usually costs about $30–70 plus the state certificate fee; in states that run their own emissions programs the fee is often a flat amount set by the state.

What happens if my car fails the emissions test?

You get a report with the reason for the failure, and the car needs repairs before a retest. Many states give a free or discounted retest within a set number of days, and some offer repair assistance or waivers when repair costs pass a limit.