Common Causes and Fixes from the Experts at Brown’s Alignment in Raleigh, NC
It’s one of the most anxiety-inducing moments behind the wheel. You’re cruising through Raleigh and that little orange light pops on the dash. It’s the dreaded check engine light. What does it mean? Is it serious? Should you pull over immediately?
A check engine light, also known as a malfunction indicator light (MIL), is a warning indicator on your dashboard that turns on when your car’s computer detects something wrong with the engine, transmission, or emissions system. Basically, it’s your vehicle’s way of saying, “Something’s not right”. The good news is, the check engine light doesn’t always mean a major repair is necessary, but ignoring it could lead to bigger problems down the road.
At Brown’s Alignment in Raleigh, N.C., we’ve been diagnosing check engine lights, performing quality repairs, and getting Raleigh drivers back on the road quickly and safely for decades. Keep reading to find out some of the most common problems we see that cause the check engine light to come on, and potential ways to resolve them.
Common Causes of a Check Engine Light
1. Worn Spark Plugs and Faulty Ignition Coils
This is one of the most frequent and easily fixable causes of a check engine light. Spark plugs ignite the air-fuel mixture in your engine. When an ignition coil fails, it disrupts the spark generation process in your engine leading to misfires, poor performance, and reduced fuel economy.
The Fix - Replacing the malfunctioning coil and the spark plug can restore smooth engine performance and eliminate the problem that triggered the check engine light.
Air-Fuel Mixture Problems (Including Oxygen Sensors)
Your engine runs best when the balance of air and fuel is just right. If that ratio gets thrown off due to a failing oxygen sensor, dirty mass airflow sensor, or vacuum leak, it can cause poor performance, higher emissions, and trigger the CEL to come on.
The Fix - Air-fuel ratio issues have numerous potential causes, and can be complex to diagnose and repair. One of our highly trained and experienced technicians will run a full computer diagnostic scan, closely inspect related components, and perform the proper repair to get your air-fuel ratio balanced again.
Loose or Faulty Gas Cap
Believe it or not, one of the simplest culprits is your gas cap. If it’s loose, cracked, or missing altogether, fuel vapors can escape from the evaporative (EVAP) system, causing the check engine light to turn on.
The Fix - Replacing the gas cap and clearing the trouble code (DTC) from the computer is often all that’s needed to remedy the cause of common EVAP codes like P0456.
🚦 Did You Know?
If your check engine light is on, your vehicle will FAIL a North Carolina state emissions inspection, even if it seems to be running fine. Getting it diagnosed and repaired is necessary to pass inspection and keep your vehicle registration current.
Evaporative Emissions System (EVAP) Leaks
Your EVAP system traps and stores gasoline vapors to keep them from polluting the air. A small leak or failing component, like a purge valve or fuel vapor (charcoal) canister, can cause your check engine light to alert you there’s a problem.
The Fix - The evaporative system has many components that can leak or malfunction, so diagnosis by a skilled automotive technician is essential. We use a specialized diagnostic test that pumps smoke into the EVAP system. This allows a trained technician to find small cracks leaks in components that may not be visible to the naked eye.
Catalytic Converter Issues
The catalytic converter reduces harmful emissions from your exhaust. When it starts to fail, it can lead to sluggish performance, rattling noises, or a persistent check engine light.
The Fix - Persistent or recurring catalytic converter codes such as P0420 & P0430 often indicate the converter will need to be replaced. However, these codes don’t always mean the catalytic converter itself is bad. Sometimes, oxygen sensor problems, exhaust leaks, or engine performance issues can trigger the same codes. That’s why proper diagnosis by a professional is key before replacing anything.
What Should I Do If My Check Engine Light Is On?
● Don’t panic, but don’t ignore it either – Your car may seem to be running fine, but damage may occur over time if the issue is not repaired.
● Contact Brown’s Alignment – One of our expert technicians will perform thorough diagnostic testing with state-of-the-art equipment to determine what’s causing the issue. Then, one of our knowledgeable service advisors will explain everything to you, and provide you with an estimate for the cost of repair. At Brown’s Alignment, we are always focused on offering honest vehicle assessments - no pressure, no scare tactics.
What Does a Blinking / Flashing Check Engine Light Mean?
🚨 Never ignore a blinking/flashing check engine light! 🚨If the check engine light is flashing/blinking, your vehicle is saying, “I’m having a serious problem, and need to get checked out ASAP”. If your CEL is blinking, you should stop the vehicle as soon as safely possible and get it to a repair shop.
Potential causes of a blinking/flashing check engine light include:
Severe engine misfires or internal engine damage
Transmission problems, sensor, or control module failures
Catalytic converter damage
What Should I Do If My Check Engine Light Is Flashing?
● Slow down to reduce load on the engine if you're on the road.
● Avoid highway speeds, towing, or heavy acceleration if possible
● Safely pull over and have the vehicle checked as soon as possible. Remember, if the CEL is flashing, it’s always better to have your vehicle towed to a shop than to continue driving more than the distance necessary to safely get off the road. Continuing to drive with a blinking check engine light can result in serious mechanical damage to your vehicle.
● Contact Brown’s Alignment to schedule diagnostics right away.
Family-Owned and Trusted Since 1985
At Brown’s Alignment, we’ve built our reputation on trust, skill, and real relationships with our customers. Whether it’s something simple or something more involved, we’ll walk you through every step with clear communication and reliable service.
Come visit us in Raleigh or give us a call to schedule your check engine light diagnosis today. We’re here to get you back on the road