Came here to get my emissions done on my ‘14 F250 diesel. Made an appointment online and the process was quick and easy. Came here because they were the best price in town. Waiting room is bare bones, so I wouldn’t plan on sitting there for an extended period of time, but truck was in and out in 10 minutes or less, so you shouldn’t need the waiting room as long as you book an appointment.Truck is lifted with 35s, and they had no issues with the tire height which was also a huge plus since Clean Aire Colorado can only do up to 33” tires.Would recommend and will be back next time emissions are due!

The gentlemen at L & N Diesel were fantastic. I came in for emissions on my cummins, and they found a leak on my high pressure fuel rail. Rather than charge me a fee for finding the leak, they showed me, I repaired it myself, and they rescheduled me for the same day (on a saturday no less). Emissions were quick and easy, and the price was fantastic. I will definitely give them my future business. Highly recommend!

We had our diesel emissions test performed at L&N. Fast and easy to work with.

Give these guys five stars for the diesel emissions testing. I called in on a Thursday morning because I needed to get the emissions test as soon as possible. Every other shop was a few days out up to 3 weeks out. I mean come on its just an emissions test you hook it up run it on the dyno and either passes or not why are you so far behind other shops. L&n polite quick and doing the job plus best price in town. Alls I did was the emissions test and it was worth it well done guys!

Super nice people. I was over an hour early and they still got me in right away and was done in 20 minutes. A little on the dirty side but might be strange if it wasnt given its a diesel emissions testing facility.

These guys are quick! My first time here and I was in and out in no time. Ill go back for diesel emissions next year.

Got my truck in and out quickly for its annual emission test. Highly recommend if you own a diesel.

Great place. In and out quickly. Great service.

Worst place to go to they scratched my bumper and denied everything. As you can see on the photos they tried to wipe it off just before giving the car back. Watch them. Also they never take their gloves off when pulling vehicles in left grease on my visor and on my steering wheel. My car just left the detail shop before coming to them. Stay away from this place just a nightmare

Fast and friendly , go here if you ever need a vin verification only 15 bucks cheapest I found !

Excellent staff Wick in and out service. They just need protective seat covers & floor mats for vehicles that are in immaculate condition. Jay A. Buerger. Parker/Denver CO

Easy online appointment scheduling and they are quick.

Great service. Quick and easy

These guys are consummate professionals and are a credit to the emissions program of the state of Colorado they help everyone from diesel Mercedes owners to every last pickup truck that shows up!

Great diesel repair and emissions testing!

Great, only place ill go to get my emissions done on the diesel. In and out in less than 10 minutes every time.

After purchasing my 1st diesel vehicle, I was told by Air Care Colorado that they didnt do diesels and they sent me to the place next door from this place who sent me here as they only do 4wd vehicles. Getting my diesel vehicle emissions test at this location was by far the smoothest, quickest and best emissions test Ive ever gotten. The staff was knowledgeable, friendly, courteous and quick. Dont waste your time going anywhere else for your diesel vehicle emissions test.

Im and out fast. Service was quick, polite, and professional. They were careful with my truck and that was important to me.

Quick service and cheapest out there. Will come again when I need my emissions done again.

They were great!!! I made an appointment by calling them. Showed up on a Friday and there were 6 people waiting for their diesel emissions test. The nice kid behind the counter made sure my appointment time was honored. Test took all of 10 minutes and I was out the door! Will go back next time.

Super busy but they still have time to work you in if you drop in. Quick turn around. These guys are good.

Fast and easy diesel emissions. Only complaint is that one of the techs held the exhaust nozzle on via standing on my exhaust tip. No damage but very easily could have been.

Test took hardly any time at all, and I was quickly on my way. Young man at the counter was friendly.

#1 place for diesel emissions in the area!!! Ive been hoing here for years and will continue to do so. They have always been honest.

They dont advertise that they do diesel only but theyll do a single axle which is a car. When I went there they looked at me like I was in Alien all men sitting around smoking and stared at me until I said is this an emissions testing place? And they go diesel only. they turned away and acted as if I never existed. So apparently you need to be a man and you need to have a diesel vehicle in order to get any help. The place is pretty run-down so you know youre in the right spot if youre in a bad neighborhood with men only.

These guys are fast and you can make an appointment online. Thanks! Good price too!

Great customer service, fair price. I will be going back.

I have used this place for several years now for my diesel vw beetle and F250. Always quick and easy. Outside needs some remodeling Ill agree, but they get the job done at a reasonable price.

Very nice service team. Professional and quick. Highly recommend.

Fast friendly service. My husband was in and out, in under 30 minutes. Great pricing, definitely beats the competition.

Could’ve told me my truck didn’t need emissions test done ...poor courtesy of honesty they where just quick to make money off costumers don’t recommend this place at all

Great place

Good service and excellent food

Quick and easy. Can schedule appointments online or walk in.

Super professional staff, parking lot is easy to drive into, the techs are professional and have strong attention to detail. This shop knows their business and it shows. This is my #1 diesel emissions shop. Ill be coming back.

Just had a great experience getting my TDi emissions here .Use there online appointment scheduler . In and out in less than 15 min. Experience was professional , and they were quick!

FANTASTIC CUSTOMER SERVICE, Professional, Efficient and Courteous. I needed a emission on my diesel Ram pick up. I was in and out in less than 10 min. I gave my paperwork to one guy and the other did the test. I Highly recommend these fine folks to do business with. They are located on the corner. 1700 West Mississippi ~~》》Please dont mix them up with the emission place next to them.

Convenient location, reasonable price for our little diesel emissions test and super fast!!! We were in and out in under 10 minutes. They had it testing before we even sat down. Well worth the drive even if not close for you. Very nice technicians and shop manager too.

Im from Colorado Springs. It was well worth the drive to come up here. I didnt spend more than 10 minutes in the office. The staff was super friendly. And it cost half as much as the place in the springs! Thank you for such a great customer service experience!

Doing their job... Down to earth guys polite and confident. Yes... recommended.

Always friendly and helpful

These guys are great! Super fast and professional.Be warned - there is another diesel emissions testing place next door. They cost more, don’t test front wheel drives, and are pretty unprofessional. Avoid the yellow building and go to the white one if you want L&N (and you do).

Ive been to this place a few times for emissions testing for my BMW. Youre in and out in 15 minutes. Ill go to them as long as I own a diesel vehicle. Theyre pretty calm inside and very efficient.

Excellent service. I had them replace a FICM on my Ford 6.0 diesel and the tech was very knowledgeable. I spoke with the tech and felt completely comfortable with him working on my truck. I also had them do a diesel emissions test and it took a couple of minutes. I will be back to have them work on my truck in the future when something needs repaired or I need new brakes.

The inspection was done very efficiently. I made an online appointment and they were ready for me when I arrived.

This is the best place to get an emissions test on a personal diesel car! Awesome and efficient!

Quick diesel emissions test at a good price.

Very efficient. I have a diesel car, and they do diesel emissions testing here. I called and made an appointment. When I arrived, they got my car in right away and were done within a few minutes, complete with sending my results to the DMV so I could renew online.

Everyone was friendly and great customer service got me in and out very quickly highly recommended!!

Great place for Diesel Emission Testing. I had a check engine light on from a sensor that I has already replaced. They cleared the code before testing for me. They also did the VIN verification. They made my life easy there. In and out quickly.I had called ahead and was told a price less than what they had posted on the wall, not sure if they charge the $5 upcharge price for walk-ins. Good to call and see what you get.I have used the business next door in the yellow building before as well. Both do good work and have good service.

I highly recommend. Very professional, very fast, best price I found on the net. I needed a diesel emissions test on my F-450. I called ahead but didnt need an appointment. I was checked in right away. I think I sat in my chair for less than 10 minutes and the test was done including the official Diesel Vehicle Inspection Report!

These guys are great. They are very friendly, honest and fair. They always tell you like it is without any BS, which is a welcomed approach in todays world. Would highly recommend.

They have everything with good price and quality

Great place

Fast, great place to have your diesel emissions tested

Quick and easy diesel emissions. Great service. Worth the trip.

Very fast in an out with an appointment.

Nice people and quick service. I did diesel emissions on my 2006 3500 on Tuesday (03/03/15), and had good service. Before I even had my name written down my truck was on the dyno with wheels spinning. For the diesel emissions test and VIN Verification it cost $55 total (I think the VIN was $20 of it), and I was only there for less than 15 minutes. They didnt try to sell me any other services, which was a concern given some of the diesel testing facility reviews I read.

Easy to get a diesel emissions inspection. And it was reasonably priced.

I arrive shortly before my appointment, my truck went in for a test at the time of my appointment, it was completed and I was on my way in 20 minutes.

Quick & Efficient, Best shop for your diesel emission testing

Worst experience ever! I gave them the diagnostic report of my transmission I recieved from the other mechanic, they quoted me $1000 less so I decided to go with them. after towing the car there, a week later they said my transmission was going to have to me replaced vs rebuilt for $800 more than what I was quoted for a rebuilt. I wanted a cheaper used transmission , 2 weeks later they said it could be rebuilt and charged me $700more than the quote. I was without my car for over a month, once it was finished, the starter went out which I had replaced 1 month prior to the transmission issue. they claimed it was not their fault and charged me $300 to replace it. And they threw away my bottom panel claiming they never even saw it but offer to replace it... its been over 2months!

Great place, was in and out in under 30 minutes without an appointment. Highly recommend.

Did my Mercedes diesel emission twice, great guys, in and out in 15 minutes. Second time I didn’t make an appointment, just stopped by and was out of there in 15 minutes.

Ive been going to this place since I bought my 93 diesel Benz.I recommend to any diesel owner. 🙂

Great place! I was in and out in about 15-20 minutes.

No hassles, Quick test and Bargain pricing. I have found my new Emissions testing location.

Great place extremely fast emission test.

Best diesel shop they will figure it out 4 u

They took care of my girlfriend when she went there for her emissions, good people.

Great service

I am a regular for diesel emissions. Great quick service

Fastest emissions test for DIESEL$!

Always fast, friendly service. Fastest, most affordable diesel testing in town

Fairly efficiently run operation. Standard pricing for state required emissions testing. Reasonably friendly.

Super fast, friendly and reasonable cost. I will be back. Brownie points for being open on a Saturday when their competition was not.

I was in and out in less than 10 minutes. (Probably closer to 5) Even with such a small office there were accomodations, and the staff was knowledgable, polite, and efficient. Along with the fact that they were the only place open on a Saturday, I dont think I couldve found an easier place for diesel testing tested.

Reviewers have it all wrong. This place rocks. Fast friendly knowledgeable service.Dont go to the yellow place next door, rude idiots.

The quickest emissions test ever. These guys are great.

Nice experience, very attentive personal fast service no problem finding the address, I highly recommend this shop

So fast, friendly and cant recommend enough. Maybe ten minutes and I was out of there.

Fast and great service for my light duty diesel.

$50 inspection fee. I called a day ahead to schedule an appointment and was in and out in about 15 minutes.

Expensive

Quick and simple service if you need a diesel emissions check!

I went to take my 2500 Duramax to get an emmisions, I thought it was going to be a long process but I was in and out quick maybe 10 15 minutes ! The owner is a little on the serious side but I will return for my emmision needs on my trucks .. Thanks

Told me I needed a catalytic converter so I bought one and installed it. Took it to get re-inspected only to be told thats not the right kind of catalytic converter you never said it had to be a specific brand! You will not get another penny from me!

Despite the long lines, you will be served

Quick and easy diesel emissions. Wouldnt go anywhere else.

Really friendly people

I moved to Denver a couple years ago. I needed a diesel emission test and vin verification and looked online and saw L&N and the price is what drew me in. Thats exactly what these repair shops do. There is another test and repair shop that advertises $35 tests. These guys arent concerned with the test price. The real money comes when your vehicle fails and they come as your savior with some ridicoulous price to fix the problem that really didnt exist in the first place. As a business person myself I picked up on this strategy. I did my homework on this place and other shops in the Denver Metro Area and concluded this.....This place has lies and deceit writtin all over it. First they call themselves the leading diesel testing facility when the business next door in the yellow building is definatly pulling way more business than this place. I Later found out that these guys opened next door 10 years after a preexisting business and copied the shop next door! These guys also go as low as to lie about their establish date as 1982. Diesel emission testing for diesels began in the early 90s in this state. I tried to write a review on their main homepage and found that the review tab was altered so no review can be written except for the ones they made up to look perfect and in charge as the leading emission shop. If thats true than why do they post the next doors pics of the yellow building as a pic of their own? Its obviously to try and fool consumers into thinking its the same shop since the other building does way more volume than this place. Mass majority does not lie. The yellow building next door is the only testing shop that only does diesel emission testing and thats it. These other guys are like leaches trying to take advantage. If you want a fair test than the the only way get it is by somebody who doesnt profit off your misery,.

Ive used these guys for years. Great job

Great Service

Quick on appointments and very friendly..

VERY unethical business!!! They tried to steal my business when I was going to Cartech! They made me think they were the place I was going to, but I have used Cartech for many years, so I knew where I was going and would NOT change.QUIT BEING CROOKS!

Excellent job

Great place for diesel emissions test.

Quick, easy, not much on amenities, but who cares?

To @Kiley Fraley - it opens at 8:30. Perhaps thats the issue. Maybe you shoud look at the opening times.

Very rude people. After we paid for an emissions test, they made sure you knew you were wasting their time by being there, and that they were too busy to answer questions or help with the next steps of repair.