What caused my check engine light to come on? Here are 5 common triggers

Interstate Automotive • April 16, 2025
A close up of a car dashboard with a warning light and a rpm gauge

Seeing your check engine light illuminate on the dashboard can be alarming, but it doesn’t always mean your car is about to break down. The check engine light is designed to alert you to potential issues that range from minor to major. Addressing the problem early can prevent more costly repairs and keep your vehicle running smoothly. At Interstate Automotive, we provide expert check engine light diagnostics and repair in the greater Olympia area. Here are five of the most common reasons your check engine light may turn on.


Faulty Oxygen Sensor

Your car’s oxygen sensor monitors the level of unburned oxygen in the exhaust and helps regulate the air-fuel mixture. A failing oxygen sensor can lead to poor fuel-efficiency and increased emissions. Replacing a faulty oxygen sensor as soon as possible helps maintain fuel economy and engine performance.


Malfunctioning Mass Airflow Sensor

The mass airflow (MAF) sensor measures the amount of air entering the engine and helps adjust fuel injection accordingly. A malfunctioning MAF sensor can cause poor acceleration, rough idling, and reduced fuel-efficiency. If the sensor fails, the car may even stall or have trouble starting. 


Worn or Failing Spark Plugs and Ignition Coils

Spark plugs and ignition coils play a crucial role in igniting the fuel mixture in your engine. When these components wear out, your car may experience misfires, rough idling, or difficulty starting. Replacing spark plugs and ignition coils at the recommended intervals helps ensure smooth engine operation.


Failing Catalytic Converter

The catalytic converter reduces harmful emissions by converting pollutants into less toxic gases. A failing catalytic converter can lead to poor fuel-efficiency and reduced engine performance. With a bad catalytic converter, you might notice a smell similar to rotten eggs.


Loose or Faulty Gas Cap

One of the simplest and most overlooked reasons for a check engine light is a loose or faulty gas cap. The gas cap helps seal the fuel system. If it’s loose or missing, fuel might evaporate before your engine gets the chance to run on it.


Check Engine Light Repair in Olympia, WA

For engine repair in Olympia and the surrounding area, contact Interstate Automotive at 360-505-7292. Feel free to give us a call to schedule an appointment!

4 Signs that Your Car Needs Brake Repair Now

By Interstate Automotive • October 24, 2025
Your vehicle’s brakes are one of its most critical safety systems, and any issue with them should be taken seriously. When brakes start to fail, stopping distances increase, handling becomes unpredictable, and the risk of accidents rises dramatically. Recognizing early warning signs can help you avoid costlier repairs and stay safe on the road. At Interstate Automotive, we provide expert brake repair in the greater Olympia, WA area. If you notice any of the following symptoms, it’s time to schedule professional brake service immediately. Strange Noises Unusual sounds coming from your brakes are one of the most common indications of trouble. A high-pitched squealing noise usually means the brake pads have worn thin. If the sound is more of a harsh grinding, it could mean the pads are completely worn out, and metal is scraping against metal. Continuing to drive with grinding brakes can damage rotors, so prompt attention is essential. Soft Brake Pedal If your brake pedal feels soft, spongy, or sinks quickly toward the floor when pressed, that’s a warning sign of a problem in the hydraulic system. This may be due to air in the brake lines or a fluid leak. A soft pedal means your brakes aren’t generating proper pressure, putting you at serious risk if you need to stop suddenly. If your car is leaking brake fluid, it’s a major safety hazard and best to get towed to the shop. Vibrations When you press the brake pedal and feel vibrations or pulsing, it often indicates warped rotors. This can happen from excessive heat buildup and uneven wear. Pulsing brakes reduce stopping efficiency, so it’s best to have a technician diagnose and resolve the issue as soon as possible. Warning Light on the Dashboard If your brake warning light appears on the dashboard, it’s your car’s way of alerting you to a potential issue. Even if the brakes feel normal, an illuminated light should never be ignored. A technician can run diagnostics to determine the exact cause and prevent a small issue from becoming a major one. Brake Repair in Olympia, WA For auto repair in Olympia and the surrounding area, contact Interstate Automotive at  360-505-7292  . Feel free to give us a call to make an appointment!

Don’t Overlook these Common Warning Signs of Engine Trouble

By Interstate Automotive • September 20, 2025
Your car’s engine is its heart, and when something starts to go wrong, the sooner you recognize the signs, the better. Ignoring potential engine trouble can lead to breakdowns, costly repairs, or even complete engine failure. While modern vehicles are built to be durable, they still need prompt attention when problems arise. At Interstate Automotive, we provide expert engine repair in the greater Olympia, WA area. Here’s a look at four common warning signs of engine trouble that you shouldn’t ignore. Strange Noises Engines are designed to run smoothly, so if you begin hearing unusual sounds such as knocking, grinding, or ticking, it’s a red flag. Knocking noises often signal worn-out bearings, while grinding may indicate a lubrication problem. Any strange or persistent sound under the hood deserves prompt attention from a mechanic to prevent more serious damage. Warning Lights The check engine light is one of the most common indicators of a problem, but other dashboard lights may also point to engine issues. While it can sometimes be triggered by something minor, such as a loose gas cap, it often signals issues with components like the oxygen sensor, catalytic converter, or ignition system. Ignoring warning lights can allow small problems to escalate into costly repairs. Discolored/Excessive Exhaust Smoke Your exhaust can tell you a lot about your engine’s health. Blue smoke may indicate oil burning, white smoke can signal internal coolant leaks, and black smoke often means too much fuel is being burned. Any unusual or excessive exhaust is a clear warning sign that your engine needs professional attention. Rough Idling Engines should idle smoothly, so if your car shakes, sputters, or stalls when stopped, there may be an issue with the fuel system, spark plugs, or airflow sensors. While it might start as a minor annoyance, rough idling can lead to more serious engine problems if ignored. Engine Repair in Olympia, WA For engine repair in Olympia and the surrounding area, contact Interstate Automotive at  360-505-7292  . Feel free to give us a call to make an appointment!