The dreaded check engine light. It always seems to appear at the worst time—and it’s never clear what it means without a diagnostic test. It could be a loose gas cap... or it could be a failing catalytic converter or engine misfire.

So what do you do when your check engine light is on? Should you fix it—or is it better to sell the car as-is and move on?

Let’s break down what that light really means, what it might cost to fix, and when it’s smarter to skip repairs altogether and sell your car with the check engine light on.

What Does the Check Engine Light Actually Mean?

The check engine light is part of your car’s onboard diagnostics system (OBD-II). When it turns on, it’s telling you something in the engine, emissions, or powertrain system isn’t working correctly.

Common causes include:

  • Faulty oxygen sensor
  • Worn spark plugs
  • Loose or damaged gas cap
  • Failing catalytic converter
  • Vacuum or exhaust leaks
  • Transmission issues

Some of these are simple to fix. Others can cost thousands.

How Much Does It Cost to Fix a Check Engine Light?

Here’s what you might expect depending on the problem:

Problem

Average Repair Cost

Gas cap replacement

$25 - $100

Spark plugs or wires

$100 - $400

Oxygen sensor

$150 - $500

Catalytic converter

$900 - $2,500+

Transmission-related issues

$1,200 - $4,000+

As you can see, there’s a huge range—so it’s not always worth rolling the dice.

How the Check Engine Light Affects Car Value

If you're trying to sell or trade in your vehicle, that glowing light on the dash sends a clear message: there could be expensive problems hiding under the hood.

Dealerships and private buyers may:

  • Offer significantly less for the car
  • Request you fix the issue first
  • Avoid the sale altogether

That’s why many sellers choose to work with a buyer who specializes in vehicles with mechanical issues—like DamagedCars.com.

Should I Fix the Problem or Sell the Car As-Is?

If you know the issue is minor—and you’re confident in the repair shop—fixing it might help you boost the sale value.

But if the light signals a more serious (or costly) issue and your car already has:

  • High mileage
  • Age-related wear and tear
  • Other mechanical or cosmetic problems

...then the smarter choice might be to sell it as-is.

Yes, You Can Sell a Car With the Check Engine Light On

While some buyers won’t touch a car with warning lights, DamagedCars.com will.

We specialize in buying vehicles with engine trouble, emission problems, and diagnostics issues. Our offers are based on your car’s condition, not just what’s wrong with it.

Why Sell to DamagedCars.com?

  • Get a guaranteed quote in under 2 minutes
  • No inspections or repair costs required
  • We tow the car for free from your location
  • Get paid fast when we pick it up

You won’t need to fix a thing, and there’s zero pressure to sell unless you’re ready.

How It Works

  1. Tell us about your car. Fill out our short online form.
  2. Get an offer. We’ll send a fair market value quote.
  3. Schedule a pickup. We come to you.
  4. Get paid. No fees, no delay.

Final Thoughts

If your check engine light is on and you’re staring down a costly repair—or just don’t want to deal with the uncertainty—it might be time to sell.

DamagedCars.com helps drivers like you turn problematic vehicles into quick cash. No more second-guessing diagnostics or repair bills. Just a fast, fair way to move on.

Get your offer today and let us help you skip the check engine stress.

We Buy and Pick Up Damaged Cars, Nationwide!

Principal Cities:


About Author
Rudy Rodriguez
Automotive Expert

Rudy brings 9 years of industry expertise to the table. From decoding salvage market nuances to steering CarBrain's insights.

Need answers? Get FREE advice from our client care experts NOW!

Need answers?

Frequently Asked Questions

Will Dealerships Buy My Car If Its Check Engine Light Is On?

Dealerships will leverage the a lit Check Engine Light as a reason to cut into the amount your car is worth. Do your research in order to prevent being taken advantage of by dealership tactics.

How Much Does It Cost To Clear Your Check Engine Light?

The cost to clear the light is the cost of whatever repair or service it may need. These repair costs can range from under $20 to over $1K and it is best to handle them early before small problems evolve into bigger ones.

Is It illegal To Remove Check Engine Light?

In most jurisdictions, intentionally tampering with or removing the check engine light is illegal. This light is a crucial safety feature in modern vehicles that alerts the driver to potential issues with the engine or emissions systems. Disabling or removing the check engine light can hinder the proper functioning of the vehicle and prevent the identification of potential problems that may impact safety, emissions, or performance. Moreover, in some regions, tampering with emissions-related components, including the check engine light, can violate environmental regulations. To avoid any legal issues, it's always advisable to consult the specific laws and regulations of your jurisdiction or seek legal advice before tampering with or removing the check engine light on a vehicle.

For what it’s worth...

DamagedCars is the premier marketplace for less-than-perfect cars!

Find Out The True Value Of Your Car For what it’s worth...