Check Engine Light On in Lake Mills? It Could Be Your Air Filter or ADAS System
- May 22, 2025
Few things spark concern for drivers like the glow of the check engine light. Whether you’re commuting along I-94 or taking the backroads around Lake Mills, that amber symbol on your dashboard usually raises one big question: “What now?” At Topel’s Towing & Repair, we’ve seen that feeling a thousand times, and we’re here to bring some clarity.
While many people jump to the worst-case scenario when the check engine light turns on, not all causes are catastrophic. Two prevalent but overlooked culprits are a clogged air filter and a misaligned ADAS (Advanced Driver Assistance System). These issues can interfere with your vehicle’s engine or computer systems, and when left unaddressed, they can lead to poor performance, safety hazards, and long-term damage.
This guide will explain what causes the check engine light to turn on, how the air filter and ADAS system play vital roles in your vehicle’s health, and what you should do if you see this warning in Lake Mills or surrounding areas.
What Causes the Check Engine Light to Come On?
The check engine light is part of your vehicle’s onboard diagnostics system (OBD-II). It illuminates when the vehicle’s computer detects a problem affecting your engine’s performance, emissions control, or other essential systems. While the light can signal a range of issues, here are some of the most common causes:
- Loose or Faulty Gas Cap: A surprisingly simple issue, a loose or damaged gas cap can allow fuel vapors to escape, causing the system to flag an emissions error.
- Oxygen Sensor Failure: These sensors monitor how much unburned oxygen is in your exhaust. When they fail, they can affect fuel efficiency and emissions.
- Spark Plug or Ignition Coil Issues: Misfiring spark plugs or coils disrupt engine combustion, leading to rough performance and increased emissions.
- Faulty Catalytic Converter: The catalytic converter helps reduce harmful emissions. If it becomes damaged or clogged, it can severely affect engine performance and trigger the light.
- Mass Airflow Sensor Problems: This sensor measures how much air enters the engine to help balance the air-fuel ratio. A faulty sensor can cause poor acceleration, stalling, and a lit check engine light.
- EVAP Leaks (Evaporative Emissions System): This sealed system controls fuel vapors. Leaks can occur in hoses or valves and are a common reason the light appears.
- Dirty or Clogged Air Filters: A restricted air filter reduces engine airflow, disrupting the air-fuel mixture and causing performance issues that may trigger the check engine warning.
- ADAS Sensor Faults or Misalignment: Advanced Driver Assistance Systems rely on precise sensor data. Misaligned or malfunctioning sensors, often after windshield work or suspension repairs, can send incorrect signals that confuse the computer and trigger warning lights.
We don’t rely on guesswork. We use advanced vehicle testing technology to accurately pinpoint the problem, helping you avoid unnecessary repairs and get back on the road with confidence.
The Air Filter’s Role in Engine Health and Emissions
Most drivers don’t give their engine’s air filter a second thought, but it plays a bigger role in your car’s health than you might expect.
What Does the Air Filter Do?
The air filter traps dust, dirt, pollen, and other contaminants before they can enter your engine. Clean air is essential to combustion, and your engine needs a balanced air-fuel ratio to perform efficiently. When the air filter becomes dirty or clogged, it reduces airflow to the engine, which disrupts this ratio.
This can lead to:
- Reduced fuel efficiency
- Engine misfires
- Poor acceleration
- Rough idling
- Increased emissions
- A triggered check engine light
Can a Dirty Air Filter Really Turn the Light On?
Absolutely. Your car’s engine computer measures airflow using sensors, and if the readings fall outside of normal range, it can send a code that results in the light turning on. A clogged air filter can also strain your engine over time, causing more serious wear and tear.
How Often Should You Replace It?
At Topel’s, we recommend replacing your engine air filter every 15,000 to 30,000 miles, depending on your driving conditions. If you travel often through dusty, rural, or construction-heavy roads around Jefferson County, Johnson Creek, or Waterloo, you may need more frequent changes.
We use quality filters that meet or exceed OEM standards and offer air filter replacement as part of our routine maintenance packages.
ADAS Calibration and Your Check Engine Light
Advanced Driver Assistance Systems (ADAS) are becoming standard in modern vehicles. These systems include features like:
- Lane departure warnings
- Forward collision alerts
- Automatic emergency braking
- Adaptive cruise control
- Blind spot monitoring
Why ADAS Systems Matter for Safety and Performance
ADAS systems use cameras, radar, lidar, and ultrasonic sensors to monitor your surroundings and help prevent accidents. These components are incredibly sensitive and rely on precise alignment and calibration.
When any of these sensors are off by even a fraction of an inch, it can create communication errors between your car’s brain and its components.
What Can Throw Off ADAS Calibration?
Many Lake Mills drivers don’t realize that simple repairs or everyday occurrences can disrupt ADAS functionality, such as:
- Replacing a windshield
- Getting a front-end alignment
- Repairing a bumper
- Changing suspension parts
- Hitting a pothole
- Getting into even a minor accident
When this misalignment occurs, it can confuse the vehicle’s computer, sometimes triggering warning lights or causing malfunctions that affect driving safety. In some cases, it may trigger the check engine light if the system detects faults in sensor data or communication failures.
We are Equipped for Precise ADAS Calibration
At Topel’s Towing & Repair, we’ve invested in professional ADAS calibration equipment to properly recalibrate your system after repairs, replacements, or any sensor-impacting work. This ensures your vehicle operates safely and as intended.
We work with vehicles of all types and offer full recalibration after windshield replacements, which is especially important since many ADAS sensors are mounted directly on the windshield.
How Topel’s Testing Process Protects You and Your Vehicle
We believe you deserve real answers, not quick guesses. That’s why we follow a proven, step-by-step vehicle testing process to find the true cause of your check engine light.
Here’s how we do it:
- Retrieve Fault Codes: We scan your vehicle’s computer to pull diagnostic codes, offering a starting point for troubleshooting.
- Expert Code Interpretation: Our trained technicians use real-world experience to interpret codes accurately, avoiding unnecessary repairs.
- Detailed Inspections with Advanced Tools: Using specialized equipment like the PicoScope, Hunter Hawkeye Elite Alignment, and ADAS recalibration systems, we perform in-depth inspections to pinpoint exact issues.
- Clear Communication and Repair Options: We explain what we find in straightforward terms, offering honest recommendations and repair options based on your needs.
- Precision Repairs with Quality Parts: With your approval, we complete repairs using high-quality parts and techniques that restore your vehicle’s performance and reliability.
This thorough approach ensures accurate results, protects your investment, and keeps you safely on the road.
Frequently Asked Questions About Check Engine Lights and Vehicle Testing in Lake Mills
Can the check engine light come on for something that isn’t engine-related?
Yes, it can. While many people assume the check engine light strictly refers to engine trouble, it actually covers a wide range of systems monitored by your car’s onboard computer. This includes emissions, fuel system irregularities, and even communication issues between safety systems like ADAS. That’s why vehicle testing is so important—to uncover the real reason behind the warning.
Is it safe to keep driving with the check engine light on?
It depends. If the light is solid and your vehicle seems to run fine, it could be a minor issue like a sensor fault. However, if the light is blinking, you’re hearing odd noises, or experiencing reduced power, it’s best to stop driving and call for towing—especially to avoid further damage. Topel’s offers 24/7 towing across Jefferson County for peace of mind.
Will my car pass emissions testing with the check engine light on?
In most cases, no. A check engine light typically means your vehicle is emitting pollutants outside of legal limits. Even small problems like a failed oxygen sensor or EVAP leak can cause you to fail a state inspection. It’s always best to address the issue before heading to your next emissions test.
What happens if the issue turns out to be something small?
That’s the best-case scenario—and one we see often. Sometimes it is just a loose gas cap or a dirty sensor. At Topel’s, we never push unnecessary repairs. You’ll receive a clear report with photos, videos, and expert recommendations so you can make the best decision for your situation. If it’s something minor, we’ll take care of it and get you back on the road fast.
How can I avoid future check engine light issues?
Staying on top of routine maintenance is the best defense. This includes timely oil changes, replacing air filters, checking for software updates, and scheduling inspections after any windshield or suspension work. At Topel’s, we track service history by vehicle and driving habits—so your maintenance is always tailored to you.
What Sets Topel’s Apart From Other Repair Shops?
When it comes to auto repair in Lake Mills, WI, Topel’s Towing & Repair stands out for more than just our equipment and technology. Here’s what makes us different:
- Trusted Since 1948: We’ve been part of the Lake Mills community for over 75 years. Our history is built on trust, honesty, transparency, and a true commitment to taking care of people.
- Personalized, Customer-First Approach: Our service advisors take the time to learn how you use your vehicle and tailor our recommendations accordingly. Whether you’re commuting daily to Madison or hauling boats to Lake Ripley, we service your vehicle based on your real-world needs.
- Deep Community Involvement: We proudly support local schools, charities, and events, including:
We’re more than a repair shop — we’re your neighbors and an active part of the community we serve.
What Our Customers Say
“Topel’s goes above and beyond in communicating what services and repairs need to be made to my vehicle. Their prices are reasonable and the work is always done professionally and on time. I use Topel’s for all my vehicle services.”
— Robynn T.
Don’t Let the Light Linger: Schedule Service Today
A check engine light should never be ignored. While it doesn’t always mean disaster, it’s your vehicle’s way of saying it needs attention. At Topel’s, we make sure that attention is thorough, honest, and focused on your long-term safety.
Whether you need a simple air filter replacement, a professional ADAS calibration, or complete vehicle testing to uncover the issue, you can count on our team to get it done right.
Don’t wait for a small issue to become a breakdown. Call us at 920-648-8115, visit us at 1110 S Main St, Lake Mills, WI 53551, or schedule an appointment online now.
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