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    Al's Front Range Diesel Emissions

    4.7 (3 reviews)

    Services - Al's Front Range Diesel Emissions

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    Highlands Ranch Emissions Technical Center - Comfy chairs AND the TV remote

    Highlands Ranch Emissions Technical Center

    (1 review)

    My beloved car flunked emissions!!! The OBD-II said it was the gas cap, after the "Check Engine"…read morelight appeared. So I went to Auto Zone. $25 for a new gas cap. Got one for $10 and went through emissions testing. FAIL! Aieeeee. I got a 30-day extension for temp tags, but went out of town for two weeks. Came back, and threw myself on the mercy of the DMV. A wonderful, kind, helpful lady named Karen told me that another extension wasn't possible, BUT I could get a FREE DIAGNOSTIC TEST from the State!!! And possibly a one-year waiver! Bite me, dealer who wanted $296. I made an appointment for Friday, which was the earliest available, and also the day my temp tags expired. Ack! I had to bring my failed emissions test paperwork. I was greeted by a very nice lady, checked in, and directed to a spacious waiting room with a TV, magazines, and comfy chairs! I had settled in and was happily reading a magazine, when Mark came in and sat down. He said that the problem, as stated on the paperwork, was the gas cap. I said, nah, it's not the cap. I replaced the cap. He patiently told me that they run a specific test on the cap, and mine failed the test. He then asked where I got it, and I said, "Amazon." He said, that explains it. Told me to go to a reputable auto parts store Mark was AMAZING. He's employed by the CO Dept of Health, and has been a mechanic for 40 years. He explained that Air Care Colorado is a subcontractor for the testing. He also explained that since the State services are free, they can't do repairs etc. He answered ALL my questions, of which there were many. I said that I would never have known about this service if it wasn't for the wonderful DMV agent. He said that they can't (or don't) advertise. They're located right next to the emissions testing place. I asked what would happen if I got a new cap and the car flunked again. He said, "Then you come back and see me." I got a new gas cap, went through the emissions testing again, and PASSED. Dealer had said it might be a valve thing and could cost $1500-5000 to fix. Smh. $30 for a gas cap, and done. I cannot overstate how GREAT this service, and these people (Mark and nice lady) are. If your "Check Engine" light comes on, and/or your car flunks emissions in Southeast metro Denver, this is the place to go. Call for an appointment. I don't think that they take walk-ins.

    Al's Front Range Diesel Emissions - smog_check_stations - Updated May 2026

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