Car Diagnostic test

5 Warning Signs That Your Car Needs a Diagnostic Test

Daniel McDonald
Daniel McDonald6 min read
5 Warning Signs That Your Car Needs a Diagnostic Test

Just like our bodies, our cars need regular checkups to maintain peak performance. Unfortunately, we often don't give our cars the attention they deserve until something goes wrong. By then, it's often too late and expensive to fix the problem. That's why it's important to be on the lookout for early warning signs that you need a car diagnostic test. Here are 5 of them.

1. Your car is losing power.

If your car seems like it doesn't have the same get-up-and-go as it used to, it could be an indication that something is wrong under the hood. loss of power can be caused by a number of things, including a spark plug problem or a fuel system issue. Either way, it's best to get it checked out by a professional as soon as possible.

2. You're seeing smoke coming from your car.

This is almost always a bad sign, regardless of what kind of smoke it is—white, blue, or black. Any type of smoke is an indication of an engine problem and should be diagnosed immediately.

3. Your car is making strange noises.

If your car starts making strange noises, it's worthwhile to get a diagnostic test to figure out what's causing them. It could be something as simple as loose change in the ashtray rattling around or something more serious like engine trouble. In any case, it's always better to err on the side of caution and get your car checked out rather than ignore the problem and hope it goes away on its own.

4. Your "check engine" light is on.

One of the most common reasons people bring their cars in for diagnostic tests is because their "check engine" light is on. This light can come on for a variety of reasons, some more serious than others. However, it's always best to have a professional take a look just to be safe.

5. Your car is overheating frequently.

If your car has been overheating recently, there could be a problem with your cooling system—possibly even a leak in your radiator hose. This is definitely something you'll want to get checked out right away before it causes any more damage to your car's engine.


These are just 5 of the many warning signs that your car might need a diagnostic test. Of course, the best way to avoid having significant problems with your car is to keep up with regular maintenance. But if you do find yourself in need of a diagnostic test, don't hesitate to bring your car into the shop—the sooner you do, the better.

Frequently asked questions

How much does a diagnostic check on a car cost?

Most mechanics will charge a diagnostic fee, which is generally around $50. The amount of the fee may depend on the type of car diagnostic tests that are done. Some shops may waive the fee if you end up getting the repair work done at their shop.

How do I check my car for diagnostics?

To check your diagnostic trouble codes, you'll need to plug an obd2 scanner into the diagnostic port. OBD2 scanners are available for purchase at most auto parts stores.

Should I do an engine diagnostic test on my car?

There is no definite answer as to whether or not you should do a diagnostic test on your car. Ultimately, it depends on the severity of the problem and how confident you feel in diagnosing and fixing it yourself. If you're not sure where to start, it might be best to take it to a professional.

How long does a full car diagnostic take?

It takes about an hour to do a full car diagnostic.

What is a full car diagnostic?

A full car diagnostic is a process that checks all the systems in a car for potential problems. A technician will connect a scanner to the car's computer system and run a series of tests to check things like the engine, brakes, air conditioning, and more. This allows them to identify any issues that need repair and fix them before they become bigger problems.

What are the signs of engine failure?

The most common signs of engine failure are a sputtering sound, decreased power, reduced acceleration, and smoke and flames coming from the engine. If you notice any of these signs, pull over to a safe place as soon as possible and call for a mobile mechanic.

Can I diagnose my car with my phone?

Yes, there are a few car diagnostic apps that can help you troubleshoot problems with your vehicle. They allow you to read error codes, check fuel economy, and more.

How can I read my car code without a scan tool?

If you don't have a scan tool the best way to read the code from your car is to contact a mechanic.

What do you do when the check engine light comes on?

The check engine light could be indicating a wide variety of problems with your car, so it's important to take it to a mechanic to get it checked out.

What is the difference between a diagnostic check and a tune-up?

A diagnostic check is used to identify problems with a vehicle and its major components, while a tune-up is part of regular car maintenance meant to improve the performance and efficiency of a vehicle.

Why would my "check engine" light come on?

There are many reasons why a "check engine" light might come on, some of which are quite serious. Many times the light will come on because of a minor problem, such as a loose gas cap, or faulty ignition coils, but it's always best to have the car checked out by a mechanic just to be sure. Some common reasons for the light to come on are low fuel level, defective emissions control system, ignition problems, problems with the fuel injection system, and worn-out parts.

How do I know if my car needs a diagnostic check?

There are a few things you can do to tell if your car needs a diagnostic check. One is to check the engine light. If it's on, that means there's a problem and your car needs to be checked. Also, listen for strange noises while the car is running. If you hear something unusual, it might mean there's a problem with the engine or another part of the car. Finally, pay attention to how the car drives. If it doesn't seem to be driving smoothly, that could mean there's something wrong and you should get a car diagnostic test immediately.

What are some of the problems that can be diagnosed during an automotive diagnostic check?

The most common problems that can be diagnosed during an automotive diagnostic check include engine problems, transmission problems, and electrical issues. These are just a few of the many possible problems that can be diagnosed during a diagnostic check; so it is important to consult with a technician if you are experiencing any issues with your vehicle.

Does a diagnostic test require special tools or equipment?

A diagnostic test doesn't require any special tools or equipment. You can do a basic diagnostic test at home with just a few simple tools. However, if you're experiencing problems with your car, it's always best to contact a mobile mechanic for a more thorough diagnosis. They have the experience and the equipment to properly assess the issue and recommend a course of action.

Can I do a DIY diagnostic test on my car?

You can do some simple tests on your own, but if you're not sure what's wrong, it's best to consult with a certified mobile mechanic to scan your trouble code and perform a simple diagnostic test.

How can I prevent engine failure?

There are a few things you can do to help prevent engine failure. One is to keep the engine oil level topped off. You should also make sure the coolant level is correct and that the radiator is free of obstructions. It's also important to keep the car well-maintained and to replace any worn-out parts as soon as possible. Finally, don't ignore the check engine light and monitor the exhaust system for excess smoke. If it comes on, contact a mobile mechanic right away for a diagnosis.

Is it worth repairing a car with engine problems?

It depends on the severity of the engine problems and how much it will cost to repair. In some cases, it might be more economical to simply buy a new car. However, if the engine is only moderately damaged and the repairs are relatively inexpensive, it might be worth repairing the car. It all depends on the specific situation.

If my car's engine needs to be replaced, what are my options?

Your options for replacing a car's engine depend on the make and model of the vehicle. Some engines can be replaced fairly easily, while others may require more extensive surgery. It's always best to consult with a certified mechanic to get an accurate estimate of the cost and time required for an engine replacement.