JG's Diesel Emissions Testing LLC

JG's Diesel Emissions Testing LLC, 13790 E I-25 Frontage Rd D3, Longmont, CO 80504, is a diesel specialist focused on emissions testing. Jim, the owner, tests diesel engines with a diesel opacity method and provides a quick, friendly service. Open daily 9 am to 5 pm, appointments are available and many customers are scheduled on Saturdays. The shop tests diesel pickups and other diesel vehicles, often in 30 minutes. Prices are described as affordable. This dedicated emissions station is a good pick if you need a diesel emission test done locally near Boulder.

Smog inspection station

Test Only

Longmont, CO

Contact

Address 13790 E I-25 Frontage Rd D3, Longmont, CO 80504, United States

Phone +1 720-487-8997

Website http://jgdet.com/

Hours

Monday 9 am–5 pm

Tuesday 9 am–5 pm

Wednesday 9 am–5 pm

Thursday 9 am–5 pm

Friday 9 am–5 pm

Saturday 9 am–5 pm

Sunday 9 am–5 pm

Services

Station Type Test Only

Test Types

Diesel Opacity

Vehicles Served

Light Diesel Passenger Cars

Languages English

Practical Information

Appointments Recommended

Typical Wait 15-30 minutes

Pricing Contact for pricing

Payment

Credit Card Cash

Rating

5.0 / 5

Based on 14 reviews

5.0 / 5

Emissions Testing rating (16 reviews)

Location

Longmont, Colorado

More stations in Longmont

What Customers Say

Fast Service Friendly Staff Knowledgeable Easy Process Clean Facility Good Communication

Speed: Fast

Pass Rate

Standard

Based on customer review sentiment

Making the Most of Your Visit to JG's Diesel Emissions Testing LLC

Choosing the right emissions testing station in Longmont, Colorado can save you time, reduce stress, and help ensure your vehicle passes its inspection on the first try. JG's Diesel Emissions Testing LLC is one of the licensed emissions testing locations in the area, and preparing properly before your visit can make the process smoother.

Understanding Colorado Emissions Testing Requirements

Emissions Testing rules in Colorado vary by vehicle type, registration ZIP code, and model year. Since requirements can differ even within Longmont, confirm what applies to you before heading to JG's Diesel Emissions Testing LLC. Our Colorado Emissions Testing guide outlines current rules, exemptions, and testing intervals.

Before Your Emissions Testing

To help make your emissions testing 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. JG's Diesel Emissions Testing LLC currently has 14 reviews with a 5 out of 5 rating, which can provide insights into service quality, wait times, and professionalism.

Visit Checklist

1

Verify Certification

Ensure JG's Diesel Emissions Testing LLC is an active, licensed emissions testing station in Colorado.
2

Check Reviews

Read recent customer feedback from other Longmont drivers to understand typical wait times and service quality.
3

Confirm Services

Call ahead to confirm the types of tests offered. Appointments are recommended but walk-ins may be accepted.
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 policies with your local Colorado authorities.

FAQ

Common questions

Have a question not covered here? Contact us and we will respond within one business day.

Where is JG's Diesel Emissions Testing LLC located?

JG's Diesel Emissions Testing LLC is located at 13790 E I-25 Frontage Rd D3, Longmont, CO 80504, United States in Longmont, Colorado.

What services does JG's Diesel Emissions Testing LLC offer?

JG's Diesel Emissions Testing LLC is categorized as a Smog inspection station and operates as a Test Only station offering Diesel Opacity testing for light diesel, passenger cars.

Does JG's Diesel Emissions Testing LLC provide Emissions Testing?

Yes, JG's Diesel Emissions Testing LLC provides Emissions Testing in Longmont, CO. Available test types include Diesel Opacity.

What are the hours for JG's Diesel Emissions Testing LLC?

JG's Diesel Emissions Testing LLC is open: Monday 9 am–5 pm, Tuesday 9 am–5 pm, Wednesday 9 am–5 pm, Thursday 9 am–5 pm, Friday 9 am–5 pm, Saturday 9 am–5 pm, Sunday 9 am–5 pm.

How can I contact JG's Diesel Emissions Testing LLC?

You can reach JG's Diesel Emissions Testing LLC by phone at +1 720-487-8997, online at http://jgdet.com/, or by visiting 13790 E I-25 Frontage Rd D3, Longmont, CO 80504, United States.

Do I need an appointment at JG's Diesel Emissions Testing LLC?

JG's Diesel Emissions Testing LLC recommends scheduling an appointment but also accepts walk-ins. Contact them directly to confirm availability.

How long does Emissions Testing take at JG's Diesel Emissions Testing LLC?

Typical wait time at JG's Diesel Emissions Testing LLC is 15-30 minutes. Customers generally describe the service speed as Fast.

What payment methods does JG's Diesel Emissions Testing LLC accept?