A light that shows up for a few days and then disappears still left a record. We read that record, then test the system it points to before the fault returns.

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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 Watauga

An intermittent light still leaves a trail

A check engine light that comes on, goes off, and returns a week later is easy to ignore. On many vehicles the computer turns the light off after several drive cycles without the fault, but it keeps a history code in memory. That stored code, plus any pending codes, shows us which system has been acting up.

Intermittent faults usually come from things that change with conditions: a connector that loses contact once the engine warms up, a sensor that fails when hot, a small evap leak that only shows on certain mornings, or a coil that misses under load. The freeze frame data records speed, engine temperature and load when the code set. That lets us recreate those conditions and catch the fault while it is happening.

How it works

Describe the problem

A quick call or text with the symptoms and where the vehicle is.

Approve the price

Nothing gets touched until you say yes to the number.

Get it fixed onsite

We do the work in your driveway, lot or job site.

Warning signs

Patterns that point toward an intermittent fault

Light only after a long drive

Heat-related failures in sensors, coils or wiring often appear once everything is hot.

Light after filling up

An evaporative system leak, often at the cap, the filler neck or a purge valve.

Light that clears after a few days

The computer stopped seeing the fault, but the code stays stored.

Brief stumble right as the light appears

A misfire or sensor dropout that may leave a pending code.

Light after the engine gets wet

Moisture in a connector or a cracked coil boot can cause a short-lived misfire.

How it works

How we track down a fault that comes and goes

Reach out while the light is on if you can, since an active fault is easier to test. If it has already gone off, call or text anyway. Tell us when it tends to show up and what you were doing at the time.

We meet the vehicle where it is parked and pull stored, pending and history codes with their freeze frame data. We may wiggle harnesses with the scope connected, warm the engine to the temperature where it failed, or watch a sensor signal for dropouts. Once the cause is confirmed, you get a price before we start the repair. Connector, sensor and coil fixes usually happen onsite, and bigger work is scheduled.

Around Watauga

When to call about a light that keeps coming back

The second time the light comes on is a good time to call, even if it went off again. A fault that keeps returning tends to get worse, and an intermittent misfire can still damage the catalytic converter. Keep a short note on your phone with the date, the outside temperature and what the engine was doing each time. If the light ever flashes, slow down and park the vehicle.

We cover all of Watauga

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

Call 817-709-1357

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

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Questions

Check engine light questions from Watauga.

If the light went off, is the problem fixed?

Usually not. The computer stopped seeing the fault for a few drive cycles and turned off the lamp, but the condition behind it is often still there. The stored code can still be read. Text us the vehicle details and we can pull it before the light returns.

Should I wait until the light is on to call?

There is no need to wait. We can read history and pending codes even with the light off. If it happens to be on when we arrive, testing is a little more direct, so mention that when you call or send a work order request.

Can you test my car in Watauga while it is parked at work?

Yes. We come to the parking lot, connect to the vehicle and run our tests there. For an intermittent problem we may want the engine warm, so a vehicle that was driven in that morning is helpful. Call or text and we will find a time that works.

What is a pending code?

A pending code means the computer saw a fault once but has not confirmed it on a second drive cycle yet, so the light may not be on. It is an early warning that shows us where trouble is starting. Request a work order if your light has been coming and going.