What To Expect When You Install A Car Breathalyzer

car breathalzyer Life changes when you have a driving under the influence (DUI) conviction on record. You spend hours arranging court dates, hundreds of dollars paying fines, and you may need to install a car breathalyzer or ignition interlock in your vehicle. Although you can’t change your conviction, you can ease the transition and successfully complete your interlock device program if you know what to expect from the beginning.

How Does A Car Breathalyzer Work?

An ignition interlock or car breathalyzer prevents drunk drivers from driving their vehicle. The device is connected to your vehicle, and it has a preset level for blood alcohol concentration (BAC) determined by your state. If you blow into it when you are over the set limit, your vehicle won’t start.

All car breathalyzers must meet or exceed both local and state regulations as well as National Highway Traffic Safety Administration (NHTSA) standards. If your car breathalyzer detects alcohol above the limit, your interlock device will lock your vehicle for a period of time determined by your state – usually between 5 to 30 minutes. Once that time has passed, you can test again. If you fail the test once more, the device will lock your vehicle down for a longer period of time.

What happens if you fail a rolling retest?

If your state requires it, you may be asked to blow into your car breathalyzer when your vehicle is in motion or for a ‘rolling retest’. If you fail the rolling retest, your vehicle will sound its alarm or horn and lights will flash until you pull over and turn off the engine. In order to turn your vehicle back on, you’ll have to pass a breath test.

The Guardian Interlock is small, compact, and easy to use, and although it looks like a simple device, there is software built in to prevent cheating the ignition interlock. When you blow into your car breathalyzer, all information will be sent wirelessly to the court on a weekly or daily basis.

Drinking and driving is dangerous to the driver and everyone on the road with them. Although no one enjoys paying the fines associated with a DUI or having a car breathalyzer installed in their vehicle, it’s a small price to pay to continue driving and keep everyone on the road safe.


  1. Is there a device that could be installed just for personal use as a safety feature before any violation occurs? For example, for a personal vehicle that has teen drivers.

  2. Charles Hickman says:

    Yes – ignition interlocks can be installed voluntarily in many states. Please give a call to 800-499-0994 and a representative will help you out. Thank you for contacting Guardian.

  3. Kelvin Cressey says:

    what is the cost of these ignition interlocks

  4. Charles Hickman says:

    The cost varies by state, due to state regulations. Give Guardian Interlock a call at 800-499-0994 and a representative will be happy to give you the rates for your area.

  5. What’s the cost in Ohio?

  6. How would the lock know it’s your breath. Could someone breathe In it for you and pass?

  7. Hi guys
    I’m all the way from South Africa looking to perhaps run your product nationally , we have a terrible record with drinking & driving which results in hundreds of deaths a year .I’m inspired to change this stat. , I’m a co owner of two audio stores where our installation experience should be enough to install your product after some training.
    How can I get started with importing your product down to see if I can indeed install them and if they are compatible with most cars.

    Looking forward to hearing your response


  8. Would this be a good device for someone you know who has drank and drove and my be an alcoholic? Would it prevent them from drinking and driving?

  9. Charles Hickman says:

    You can get more information about becoming a Guardian provider at https://guardianinterlock.com/about-us/guardian-provider/

  10. Charles Hickman says:

    Please call Guardian Interlock at 800-499-0994 and they’ll be happy to quote rates and answer your questions.

  11. Charles Hickman says:
  12. Charles Hickman says:

    The devices prevent anyone who has been drinking from getting behind the wheel and driving.

  13. William de dios says:

    Can you. Get another diw if you blow and fell

  14. Charles Hickman says:

    That will depend on your state’s laws and the ignition interlock program in your state. Check with an attorney, a probation officer, or call Guardian at 800-499-0994 to speak with a representative.

  15. Gina higgins says:

    Need pricing for monthly fee and installation Cost for my dad s dodge ram 2007 Truck in Austin Texas

  16. Charles Hickman says:

    The fastest way to get pricing and an installation appointment is to call Guardian Customer Service at 800 499-0994. Thank you for contacting Guardian Interlock.

  17. Can anyone use your car without blow starting, what if the car is being repaired?

  18. Anonymous says:

    A friend told me mot to use mouthwash before using the auto breathalyzer. Is this true?

  19. Editorial Staff says:

    Certain products have alcohol in them, including many mouth wash products. It is best to always rinse your mouth with water prior to taking any and all tests.

  20. Editorial Staff says:

    To have any vehicle work completed with an interlock in your car, you will want to contact Customer Support at 800-499-0994 to obtain a mechanic affidavit. This form allows mechanics the ability to work on the car and gives them overrides to avoid testing while they service the car.

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