Ohio Ignition Interlock — Requirements & Costs

An ignition interlock device (IID) is a breathalyzer wired into your vehicle's ignition system. It prevents the engine from starting if it detects alcohol on your breath above a preset threshold. In Ohio, IID requirements are a central part of OVI consequences.

discretionary for standard first offense; mandatory for high-tier BAC (≥ 0.17) and all repeat offenses.

6 months (first offense, discretionary); 1 year (second offense); 2 years (third offense); escalates for subsequent.

Common violations that can extend the IID period or trigger additional consequences:

• Failed startup tests (BAC above threshold)
• Failed rolling retests
• Missed calibration appointments
• Tampering with or attempting to circumvent the device
• Operating a vehicle without an IID when one is required

IID costs are borne by the offender and include:

• Installation fee
• Monthly monitoring/rental fee
• Removal fee
• Calibration fees (may be included in monthly rental or charged separately)

While the IID is a restriction, it is also the mechanism that allows many offenders to resume driving sooner than they would under a full suspension. In Ohio, Limited driving privileges available after 15 days of hard suspension for test failure (first offense). For refusal, limited privileges available after 30 days. Court grants privileges for work, school, medical, and treatment purposes.. Complying fully with IID requirements — no violations, on-time calibration — is the fastest path to full reinstatement.