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Smog Check & Emissions Testing Stations in Walnut, CA

8 of the 52 auto repair shops we list in Walnut 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. Piedra's Smog Test Only

    19939 Valley Blvd, Walnut, CA 91789-2630

    Mon–Fri 8am–6pm, Sat 8am–4pm

    Smog & emissionsDiesel & truckSe habla español
    Call Website Directions

  2. Walnut Smog Check

    319 Lemon Creek Dr, Walnut, CA 91789-2650

    Smog & emissions
    Call Website Directions

  3. Ace Auto Care

    20225 Valley Blvd, Walnut, CA 91789-2600

    Smog & emissionsTransmission repair
    Call Website Directions

  4. Alamo Express Lube

    762 N Nogales St, Walnut, CA 91789

    Smog & emissionsBody & collision
    Call Website Directions

  5. Walnut Auto Care Center

    18702 Amar Rd, Walnut, CA 91789

    Smog & emissions
    Call Website Directions

  6. Pro Stop Test Only

    923 Fairway Dr, Walnut, CA 91789

    Smog & emissions
    Call Website Directions

  7. D V Smog Pros

    19817 Valley Blvd, Walnut, CA 91789

    Smog & emissions
    Call Directions

  8. STAR Certified Smog Check

    319 Lemon Creek Dr, Walnut, CA 91789-2650

    Smog & emissions
    Call 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.

Also in Walnut

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Smog Check & Emissions Testing Stations near Walnut

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.