Service | Bowie, TX
What the light is trying to say, the one thing to check before you call, and when to pull over instead of finishing the drive.
It always seems to come on at the worst time. You're halfway to Wichita Falls, or backing out of the feed store in Nocona, and a little orange engine shape lights up on the dash. The truck feels fine. You start wondering if you can ignore it.
Sometimes you can, for a few days. Sometimes you shouldn't drive another mile. The way the light behaves tells you which, and that's the first thing we'll cover before getting into what an engine diagnostic visit looks like in our shop.
Quick answer: A steady check engine light means the engine computer logged a fault. Check that the fuel cap is tight, then book a diagnostic soon. A flashing light usually means an active misfire that can damage the catalytic converter, so ease off and get it checked right away. Kory Hooks Ford's service department in Bowie runs engine diagnostics on Fords and other makes.
At a glance
Steady light
Book a diagnostic soon
Flashing light
Ease off, get it checked now
Service line
940-338-0013
In this post
- What's the difference between a steady and a flashing check engine light?
- Can a loose gas cap really turn on the check engine light?
- What usually causes a check engine light?
- What happens during an engine diagnostic at Kory Hooks Ford?
- When should I stop driving with the check engine light on?
- Questions drivers ask
What's the difference between a steady and a flashing check engine light?
A steady light means the engine computer saw something outside its normal range and stored a code. It's a heads up, not an emergency. Plenty of trucks drive normally with a steady light, but the problem behind it can get worse or cost more fuel if it's left alone.
A flashing light is a different story. On most vehicles it means the engine is misfiring badly enough that unburned fuel is reaching the exhaust. That fuel can overheat the catalytic converter, one of the pricier parts under the truck, in a fairly short time.
If it's flashing, slow down, skip the trailer and get somewhere safe. If it goes steady again once you back off, that's a clue for the technician, not a sign it fixed itself.
Can a loose gas cap really turn on the check engine light?
It can. The fuel system is sealed so vapors don't escape, and the engine computer checks that seal. A cap that wasn't clicked tight after a fill up in Bowie reads as a leak, and the light comes on.
Many newer Fords use a capless filler, so there's no cap to check. On those, a dirty or damaged filler neck can cause a similar fault. Look in your owner's manual if you're not sure which your truck has.
Tighten the cap or close the filler and drive normally for a few days. The light won't go off right away. If it stays on after several trips, there's something else going on and it's time for a diagnostic.
What usually causes a check engine light?
The list is long, because the system watches a lot of sensors. The usual suspects: worn spark plugs or ignition coils, a sensor that's reading wrong, a vacuum leak, an exhaust or emissions part that isn't doing its job, or a fuel system issue.
Some are small fixes. Others point to a part that's wearing out and will cost more the longer it goes. Heat, dust off caliche roads and short trips all add wear in North Texas, so a light that shows up after a hard summer isn't unusual.
Light is flashing: likely an active misfire. Ease off and get it checked right away.
Light plus rough running or shaking: the engine may be misfiring under load. Don't tow with it.
Light plus a hot gauge or steam: pull over safely and shut it off. Call for help instead of driving on.
Light plus low oil pressure warning: stop as soon as it's safe. Running without oil pressure can ruin an engine fast.
What happens during an engine diagnostic at Kory Hooks Ford?
A diagnostic starts with the code but doesn't stop there. A code tells the technician which system flagged a problem and roughly what kind. It doesn't say which part failed, and two trucks with the same code can need different repairs.
That's why our service department treats the code as a starting point. The usual flow on a Ford or any other make:
Talk it over
Your advisor asks when the light came on, whether it flashed and how the vehicle has been driving.
Read the codes and data
The technician pulls stored codes and looks at the sensor data recorded when the fault happened.
Test the suspect parts
They check the likely parts and wiring directly instead of replacing parts based on the code alone.
Explain before any repair
You hear what was found, what it'll take to fix and what can wait, before work starts.
A code tells the technician which system flagged a problem and roughly what kind.
Engine diagnostics are on the shop's service list right alongside tune ups, general repair and preventative maintenance, and the techs are Ford trained. If a part is needed, the parts department can usually help get it ordered.
When should I stop driving with the check engine light on?
Stop, or get off the road as soon as it's safe, if the light is flashing, the engine is shaking or losing power, the temperature gauge is climbing, or another red warning light comes on with it. Those combinations point to damage happening right now.
With a steady light and a truck that drives normally, you can usually make it home or to work and book an appointment. Hold off on long highway runs and towing until it's been looked at.
Bowie driver tip
If the light starts flashing on a long empty stretch of US 287 between Bowie and Wichita Falls, or out on a county road past Muenster, don't push on to the next town at highway speed. Pull over somewhere safe, call for roadside help, and let the truck come in on a hook instead of on a damaged converter.
Book it your way
Online, by phone, or we come get it
Schedule a diagnostic online, call 940-338-0013, or use Ford Pickup & Delivery for eligible Fords and we'll pick it up at home or work, service it at the dealership and bring it back. A vehicle that can't be driven safely needs roadside help instead, and parts and repairs are billed as usual.
How Pickup & Delivery worksHow the Light Behaves
Why did my check engine light turn off by itself?
Some faults only show up under certain conditions. When the computer stops seeing the problem for a number of drives, the light can go out, but the code is usually still stored and worth reading.
Why did the light come on right after I got gas?
A fuel cap that wasn't fully tightened, or a filler that didn't seal, is a common reason. Close it properly and give it a few days of normal driving.
Can weather make the light come on?
Big swings in temperature or humidity can expose a weak sensor or a small leak that was already there. The weather doesn't cause the fault, it just brings it out.
Code Reader Questions
Can I read the code myself with a cheap scanner?
You can, and it'll give you a general idea. A code alone rarely names the failed part, so treat it as a hint and not a diagnosis.
Is it okay to clear the code and keep driving?
Clearing the code turns the light off but doesn't fix anything. It also erases data the technician could have used, so it's better to leave it until it's been looked at.
Why do two shops sometimes give different answers for the same code?
One code can have several causes. The difference usually comes down to how much testing was done past reading the code.
Diagnostics at Kory Hooks Ford
Do you diagnose check engine lights on non Ford vehicles?
The service department works on Fords and other makes, and engine diagnostics are on the service list. Call 940-338-0013 to check on your vehicle.
How long does an engine diagnostic take?
That varies with the problem. A clear fault can be quick, while an intermittent one takes longer to track down. Your advisor can give you an idea when you drop it off.
What are the service department hours?
Service is open Monday through Friday from 8 AM to 5 PM and closed Saturday and Sunday.
Inspection and Emissions
Can the light cause trouble at a Texas emissions test?
Some Texas counties, including several around Dallas Fort Worth, still require an emissions test, and a lit check engine light generally means a fail. What applies depends on where the vehicle is registered, so check with the test station before you go.
Does a check engine light affect fuel mileage?
It can. Faults involving sensors, ignition or fuel delivery often make the engine burn more fuel than it should, even if it feels normal.
Can a bad catalytic converter set off the light?
A converter that isn't working well is one of the things the system watches for. It's also often the result of an earlier misfire that went on too long.
Getting It to the Shop
Can Ford Pickup & Delivery bring my truck in for a check engine light?
For an eligible Ford that's safe to drive, it can, depending on availability and distance. A truck that won't run or shouldn't be driven needs roadside help instead.
Should I tow it in if the light is flashing?
That's often the safer call, especially from a long way out. Driving with a severe misfire risks damaging the catalytic converter and other parts.
Can I drop it off before I talk to anyone?
Call the service line first or contact the store so your advisor knows what's coming in and what you've noticed.