The light came on right after a battery swap, an oil change or another repair. We check what was disturbed and what was already failing, then give you a price first.

Call 817-709-1357 Text us Request a work order

Call hours: Mon to Fri 7:00 AM to 8:00 PM · Sat 9:00 AM to 4:00 PM

Engine work in progress under the hood of a truck

Check engine light in Roanoke

Why a light shows up right after other work

A check engine light that appears a few days after a repair is common, and it does not always mean the repair went wrong. Work under the hood can knock a vacuum line loose, leave a connector half seated, or bend a wire that was already brittle. Disconnecting the battery also clears the computer's self-tests, and a weak part that had been passing may fail once those tests run again.

Sometimes the timing is pure coincidence. An oxygen sensor near the end of its life does not care that the brakes were just done. We sort out which situation you have by reading the codes, checking the areas that were touched, and then testing the system the code points to. We tell you plainly what we find, whoever did the earlier work.

Ready to get it looked at? Call or text 817-709-1357 and you will hear the price before any work starts.

How it works

How the follow-up visit goes

The first thing we want to know is what work was done recently, who did it, and when the light came on. A receipt or a list of the parts replaced is helpful if you have one.

We come to the vehicle and start with the codes and freeze frame data, then look over everything that was disturbed during the earlier job: hoses, connectors, clamps and ducts. If something was simply left loose, we can often correct it on the spot. If the code points to a separate failure, we test that system and give you a price before any repair. Larger repairs are put on the calendar.

Warning signs

Common causes after recent work

Airflow code after a filter change

An intake duct or mass airflow connector that is not fully seated.

Lean code after work near the intake

A vacuum hose left off or cracked while other parts were removed.

Evap code after fueling or service

A gas cap left loose or a purge line knocked off its fitting.

Codes after a new battery

Self-tests reset and an already weak sensor fails on the next few drives.

Misfire after plug or coil work

A coil boot not fully on the plug or a connector left unplugged.

Why Day's

Shop-level work, where you park.

We bring dealer-level diagnostic tools, including a lab scope and a thermal camera, to wherever your vehicle is parked.

Fords are our specialty, built on years of maintaining a construction company's fleet, from cars and light trucks to heavy-duty work trucks.

About Day's

See us on Google

Around Roanoke

When to call after a repair

Reach out soon if the light appeared within a few days of other work, while the details are fresh and before anything else gets touched. A steady light is usually fine for short trips, but a flashing light or a new noise, smell or leak means park it. Try not to clear the code yourself, since the stored data helps show what happened. Keep the receipt or parts list nearby.

We cover all of Roanoke

Your driveway, your work lot or the roadside, anywhere in Roanoke. Call or text with the year, make and model and what the vehicle is doing.

Call 817-709-1357

Questions

Check engine light questions from Roanoke.

Did the last repair cause my check engine light?

Possibly, but often not. A loose hose or connector is easy to miss, and a part that was already weak can fail after the battery is disconnected. We will tell you what we find without guessing. Call or text with the details of the earlier repair.

Can disconnecting the battery turn on the check engine light?

Not by itself, but it erases the computer's stored self-test results. As the vehicle relearns, those tests run again, and a sensor that was marginal can fail and set a code. The idle may also feel uneven for a short time. Text us if the light stays on.

Can you check my car in Roanoke if someone else did the repair?

Yes. We work on the vehicle where it sits, no matter who did the earlier job. We check the areas that were disturbed first and test from there. Request a work order and include what was done and roughly when it was done.

Should I go back to whoever did the repair first?

That choice is yours. If you suspect something was left loose, a diagnosis gives you specific findings to take back to them. If the code is unrelated to their work, you will know that too. Call or text if you want us to take a look.