Mostly, you can guess the car trouble from a Check Engine light. But it usually just tells you that there is a problem. What is the problem, and if it is complex, how can you diagnose it? This is when you need a reliable diagnostic scanner, like an Autel scan tool, for car diagnostics. 

In our previous blogs, we shared a comprehensive guide to the Foxwell diagnostic scan tool and compared Autel and Launch to help you choose the right automotive diagnostic scanner. Today, we'll explore another important topic for car owners and mechanics alike—the common car problems you can diagnose with an Autel scan tool. 

Why is this tool a good choice? Well, mostly because it can read the fault codes your car’s computer has already generated. Now, you are not working with guesswork but with actual data from your car.  So, what can an Autel scanner diagnose?

8 Common Car Problems Diagnosed with an OBD2 Scanner from Autel

So, what problems can an Autel scan tool diagnose? Here is a short list you must know: 

1. Random or Cylinder-specific Misfires

If the cylinder is not firing correctly, you will see misfire codes (P0300 and up). The scanner will tell you which cylinder is at fault and provide live data on fuel trims, ignition timing, and RPM fluctuations. This information helps pinpoint a bad coil, a fouled spark plug, or a vacuum leak instead of changing parts based on a hunch.

2. ABS and Brake System Faults

A wheel speed sensor, a wiring fault, or a problem in the hydraulic control unit is often the cause of the ABS light staying on. 

You can check the stored ABS code with a scan tool and, in many cases, monitor the live signal from each wheel sensor while rolling the car forward. This is the best way to determine which sensor is actually bad and which one has a corroded connector.

3. Battery, Charging, and Parasitic Drain Issues

A car that won’t take a charge isn’t always suffering from a bad battery. The issue can come from the alternator, a bad ground connection, or a module that fails to shut down overnight. Diagnostic software on the best Autel diagnostic tool for workshops can monitor charging voltage in real time and, on newer platforms, identify modules that remain active when they shouldn’t. 

4. Transmission Shifting Problems

Harsh shifts, slipping, or a transmission stuck in limp mode will usually throw a code related to a solenoid, a speed sensor, or out-of-range fluid temperatures. The only way to catch an intermittent shift fault that won't show up sitting in a driveway is often to read live transmission data while driving.

5. Oxygen Sensor and Fuel Trim Problems

Long-term and short-term fuel trim numbers tell you whether the engine is running rich or lean, and by how much. 

When coupled with oxygen sensor voltage readings, this can indicate vacuum leaks, a failing sensor, or a fuel delivery problem, long before it results in a rough-running engine or a failed emissions test.

6. Airbag and SRS System Faults

It is rare for the airbag light to mean the airbag itself is bad. More often, it is a seat occupancy sensor, a seatbelt pretensioner, or a wiring fault under the seat rail. 

You diagnose this system in the only safe way: with a scan tool that directly reads the SRS module. You can’t test it by feel or sound; you need a vehicle scanner.

7. ADAS Calibration Issues

This is where scan tools have seen the most change in the past few years. A cracked windscreen, bumper fix, or even a wheel alignment can throw a forward-facing camera or radar sensor out of whack. Not recalibrating the ADAS system after the work can cause features such as lane keep assist and automatic braking to malfunction. 

Automotive diagnostic tools with ADAS calibration capabilities can guide a technician through the manufacturer’s required static or dynamic recalibration process.

8. TPMS (Tire Pressure Monitoring) Faults

If you have rotated your tires or replaced a tire pressure monitoring system (TPMS) sensor, but the TPMS light will not turn off, it generally means a sensor needs to be relearned by the vehicle. For this, scan tools can read individual sensor IDs, program new ones, and verify that each wheel's position reports properly.

Note: Remember that the diagnostic may depend on the Autel diagnostic tool's model and compatibility. If the model is compatible with the car in question, you can diagnose many things. Otherwise, you may need an upgrade. 

How do I Use an Autel Scanner to Diagnose Car Problems?

No matter what issue you're tackling, the process is pretty consistent: 

• First, connect the OBD2 scanner for car owners to the OBD2 port, which is typically located under the dashboard near the steering column. 

• Next, retrieve both stored and pending codes from all the modules, not just the engine. 

• Then take a look at the live data streams for the systems associated with those codes. 

• Make sure to compare the readings with the expected ranges for that specific make and model. 

• And remember, only clear the codes after you've actually resolved the underlying problem, not before! 

Conclusion 

An Autel scan tool helps identify vehicle problems quickly, reducing guesswork and unnecessary repairs. From engine faults and transmission issues to ABS, TPMS, and ADAS diagnostics, the right scanner provides accurate insights for faster troubleshooting. 

Whether you're a DIY car owner or a professional mechanic, choosing the best car diagnostic scan tool in 2026 ensures reliable performance. 

If you're looking for a diagnostic scan tool for Australian cars or budget-friendly OBD2 tools, Auto Lines Australia offers a wide range of dependable Autel diagnostic solutions. They are designed to suit different vehicles, budgets, and workshop requirements.

FAQs

1. What types of vehicle issues can an Autel scan tool detect?

An Autel scan tool detects engine, ABS, transmission, airbag, TPMS, and battery-related faults. It also reads diagnostic trouble codes and live vehicle data.

2. Can an Autel scan tool diagnose engine, transmission, and ABS faults?

Yes, compatible Autel scan tools diagnose engine, transmission, and ABS system faults. They also display live data to help identify the root cause.

3. Do I need professional experience to use an Autel diagnostic scanner?

No, many Autel scanners are designed for beginners and experienced users alike. Basic models offer user-friendly interfaces, while advanced models provide professional diagnostic features.