Subaru Check Engine Light: Common Causes and When to Seek Help in Colorado Springs

February 2025

If your Subaru’s check engine light just turned on, don’t panic—but don’t ignore it either. This warning light can indicate anything from a loose gas cap to a serious engine issue. At Express Auto Repair, we specialize in Subaru engine light repair in Colorado Springs, offering reliable diagnostics to get you back on the road safely.

Understanding why your Subaru’s engine light is on can help you determine whether it’s an easy fix or something requiring immediate professional attention. In this guide, we’ll cover the most common reasons your check engine light may be illuminated and how our auto diagnostics experts can help.

Common Reasons Your Subaru’s Engine Light Is On

1. Loose or Faulty Gas Cap

Believe it or not, a loose gas cap is one of the most common (and easiest to fix) reasons your Subaru’s engine light might be on. A loose or damaged cap allows fuel vapors to escape, triggering the light. Try tightening it or replacing it if it’s cracked—this simple step could save you a trip to the shop.

2. Faulty Oxygen (O2) Sensor

Subarus are known for their reliability, but like any vehicle, they have components that wear down over time. The O2 sensor monitors the level of unburned oxygen in your exhaust and helps optimize fuel efficiency. A bad sensor can cause:

Reduced gas mileage
Increased emissions
Potential engine damage over time

Ignoring this issue may lead to costly catalytic converter repairs. Our team at Express Auto Repair can quickly diagnose and replace faulty O2 sensors to keep your Subaru running efficiently.

3. Failing Catalytic Converter

A clogged or failing catalytic converter is a more serious issue that requires prompt attention. Symptoms include:

A rotten egg smell from your exhaust
Decreased fuel efficiency
Poor acceleration

If your Subaru’s check engine light is on and you’re experiencing these issues, it’s time for a professional engine diagnostic at our Colorado Springs shop.

4. Mass Airflow Sensor (MAF) Issues

The MAF sensor measures the amount of air entering your engine, helping to balance the fuel-to-air ratio. A faulty sensor can lead to:

Stalling
Hesitation while accelerating
Rough Idling

Replacing this sensor at the first sign of trouble can prevent more extensive engine damage.

5. Worn or Failing Spark Plugs and Ignition Coils

Older Subaru models, especially those with higher mileage, can develop issues with spark plugs and ignition coils. Symptoms include:

Engine misfires
Rough starts
Poor fuel efficiency

Regular Subaru maintenance can prevent these issues from escalating into costly repairs. At Express Auto Repair, we provide same-day service to keep your Subaru performing at its best.

Quick Fixes vs. When to Seek Professional Help

Some Subaru maintenance problems can be solved with quick fixes at home, while others require expert attention.

Troubleshooting Steps for Your Subaru

Tighten or replace the gas cap
Check your dashboard for additional warning lights
Inspect for obvious signs of damage (loose wires, disconnected hoses)

When to Bring Your Subaru to Express Auto Repair:

If the check engine light is flashing (indicates a serious issue)
If you notice performance issues (stalling, misfires, loss of power)
If the light stays on even after checking simple fixes

Fast, Honest, and Expert Subaru Service—Here’s Why We’re the Best

With over 20 years of experience, Express Auto Repair is known for quick, reliable, and transparent service. We take the stress out of car repairs by providing expert diagnostics, top-tier customer service, and flexible financing options. Here’s why Subaru owners trust us:

Immediate Online Estimates: Get an instant repair quote through our website for a hassle-free experience.
ASE-Certified Technicians: Our experts ensure your Subaru gets the best care possible.
Quick and Efficient Service: We offer significantly faster turnaround times than competitors, so you’re not stuck without your vehicle any longer than necessary.
Flexible No Credit Financing: Unexpected repairs? No problem. We offer multiple financing options, including Snap, DigniFi, Koalafi, and NAPA Easy Pay, so you can get the service you need without the upfront financial burden.
NAPA AutoCare Peace of Mind Warranty: Enjoy 36 months/36,000 miles of nationwide coverage for added security.

We don’t just fix cars—we make it easy to do business with us.

Subaru Engine Trouble? Get Expert Repairs in Colorado Springs!

If your Subaru’s check engine light is on, don’t wait—get expert Colorado Springs auto diagnostics at Express Auto Repair. We specialize in fast, accurate, and affordable Subaru repairs to keep your vehicle running smoothly.

Visit us at:
5360 Montebello Ln, Colorado Springs, CO 80918
3655 Galley Rd, Colorado Springs, CO 80909

Call now: Montebello: (719) 358-9109 | Galley Rd: (719) 630-8729

Schedule online: Click here to book your appointment

Don’t ignore that check engine light—get your Subaru diagnosed and repaired by the best in Colorado Springs today!