California
Napa

Williams Transmissions & Express Smog

Smog inspection station
Opens at 8:00 AM
4.4 (64 reviews)
238 Soscol Ave, Napa, CA 94559
Call Now Visit Website

About

Williams Transmissions & Express Smog is a provider of smog check services in Napa, California. Their facility specializes in emissions testing to ensure vehicles meet state standards. They offer comprehensive vehicle inspections and diagnostics to identify emissions issues. Services such as catalytic converter checks, exhaust repair, and O2 sensor replacement are available to address emissions problems. Located conveniently at 238 Soscol Ave, Napa, the business caters to drivers needing reliable emissions and smog check services. Their focus is on promoting vehicle safety and compliance with California emissions regulations, providing a specialized approach to automotive testing and repairs.

smog check vehicle inspection OBD testing Napa California emissions testing

Services Offered

smog check
Vehicle Inspection
OBD-II Diagnostics
Check Engine Light Diagnosis
Emissions-related repairs

What Customers Say

Review Summary

Reviews for this business are not available online yet. Services encompass smog testing, vehicle inspections, and check engine diagnostics. Contact for details and appointments.

238 Soscol Ave, Napa, CA 94559 +1 707-224-7467 Visit Website
Hours Closed
Mon 8 am–5 pm
Tue 8 am–5 pm
Wed • 8 am–5 pm
Thu 8 am–5 pm
Fri 8 am–5 pm
Sat Closed
Sun Closed
Claim This Business

Frequently Asked Questions

Discover quick and comprehensive answers to common questions about our platform, listings, and services.

Williams Transmissions & Express Smog is located at 238 Soscol Ave, Napa, California. You can visit them during their business hours for emissions testing and smog checks.
They offer smog check, vehicle inspection, OBD-II diagnostics, check engine light diagnosis, and emissions-related repairs such as catalytic converter and exhaust services.
Yes, Williams Transmissions & Express Smog provides smog check services in Napa, California, including emissions testing to help vehicles meet state standards.
Their hours are Monday through Friday from 8 am to 5 pm. They are closed on weekends and Sundays, so plan accordingly for your emissions testing needs.
You can contact Williams Transmissions & Express Smog by calling +1 707-224-7467 for inquiries or appointments regarding emissions testing services.
Appointments are recommended but not always necessary. Contact the shop directly to confirm available times and schedule your smog check or vehicle inspection.
Service times for emissions testing at Williams Transmissions & Express Smog generally depend on the vehicle but are typically quick; contact them for specific details.
Customers rate Williams Transmissions & Express Smog highly with a 4.4-star average based on 64 reviews. Drivers often mention quick service and professional staff. For the latest feedback, check recent reviews on Google or other review platforms.

Can't find what you're looking for? Contact our customer support team

Other Smog Check Stations in Napa

PA

Precision Automotive Services

4.9 · 47 reviews
Auto repair shop · 198 Soscol Ave, Napa, CA 94559

Precision Automotive Services offers smog check and vehicle inspection in Napa, California. View hours and details.

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
RA

Redwood Auto Smog Test

4.9 · 149 reviews
Smog inspection station · 2005 Redwood Rd, Napa, CA 94558

Redwood Auto Smog Test provides emissions testing and smog check services in Napa, California. Check hours and details f...

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
QS

Quick Smog + DMV Services + Star Smog

4.8 · 293 reviews
Smog inspection station · 662 Soscol Ave, Napa, CA 94559

Quick Smog + DMV Services + Star Smog offers reliable emissions testing and vehicle inspections in Napa, California. Vie...

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis
NS

Napa Smog Test Only

4.7 · 68 reviews
Smog inspection station · 1509 Main St, Napa, CA 94559

Napa Smog Test Only offers smog check and vehicle inspection in Napa, California. View hours and details.

smog check Vehicle Inspection OBD-II Diagnostics Check Engine Light Diagnosis

Making the Most of Your Visit to Williams Transmissions & Express Smog

Choosing the right emissions testing or smog check station in Napa, California can save you time, reduce stress, and help ensure your vehicle passes its inspection on the first try. Williams Transmissions & Express Smog is one of the licensed smog check locations in the area, and preparing properly before your visit can make the process smoother.

Understanding California Smog Check Requirements

Emissions testing and smog check rules in California vary by vehicle type, registration ZIP code, and model year. Since requirements can differ even within Napa, confirm what applies to you before heading to Williams Transmissions & Express Smog. Our California emissions testing guide outlines current 2025 rules, exemptions, and testing intervals.

Before Your Smog Check

To help make your emissions test quick and successful, consider preparing the following:

  • Confirm your registration address requires testing.
  • Ensure your check engine light is off and no recent codes have been cleared.
  • Warm up your vehicle by driving 10 to 15 minutes before testing.
  • Bring your registration or renewal notice and a valid photo ID.

Why Reviews Matter

Customer experiences can vary, so reading feedback from other drivers can help you understand what to expect. Williams Transmissions & Express Smog currently has 64 reviews, which can provide insights into service quality, wait times, and professionalism.

"Clear communication and preparation make your smog check easier. Ask Williams Transmissions & Express Smog about wait times, retest policies, or emissions repair services if you have concerns."

Visit Checklist

  • 1
    Verify Certification

    Ensure Williams Transmissions & Express Smog is an active, licensed smog check station in California.

  • 2
    Check Reviews

    Read recent customer feedback from other Napa drivers to understand typical wait times and service quality.

  • 3
    Confirm Services

    Call ahead to confirm the types of smog checks and emissions tests offered and whether appointments are required.

  • 4
    Bring Required Documents

    Have your registration or renewal notice, ID, and any required paperwork ready when visiting the station.

  • 5
    Ask About Retest Policies

    Some stations offer discounted or free retests if your vehicle fails. Ask for details up front.

* This guide is for informational purposes only. Always confirm emissions testing requirements and smog check policies with your local California authorities.