How to Use Car Diagnostics Correctly: A Beginner’s Guide

Modern cars are equipped with advanced electronics that constantly monitor dozens to hundreds of parameters. When the engine warning light turns on or the vehicle starts behaving unusually, diagnostics can be an indispensable helper. In this article, we will show you how to properly use the SIXTOL SX ONE and SX FIVE diagnostic devices – from connection to result evaluation.

What is Car Diagnostics and How Does It Work?
Car diagnostics is a process in which the device communicates with the vehicle’s control unit (ECU) via the OBD II standard. It obtains information about fault codes (DTC), emission parameters, operating values, and other data.
The SX ONE and SX FIVE diagnostic devices allow you to:
• read and clear fault codes,
• display live data in real time,
• check emission readiness (I/M Readiness),
• save data for later analysis.

How to Connect the Diagnostic Device Correctly

1. Turn off the engine.

2. Find the OBD II connector – usually located under the dashboard on the driver’s side.

3. Connect the SX ONE or SX FIVE device.

4. Turn the ignition to the ON position, but do not start the engine.

5. The device screen will show the main menu with available functions.
   Selected models also support connection with a mobile app via Bluetooth.

Main Functions of SX ONE and SX FIVE Devices

1. Reading fault codes
   The device can recognize current, stored, and permanent faults. For example, code P0420 indicates reduced catalytic converter efficiency.

2. Clearing faults
   After fixing the issue, you can clear the fault. The Check Engine light will turn off if the problem was truly resolved.

3. Emission test (I/M button)
   Pressing the I/M button quickly verifies the vehicle’s emission readiness. It checks, for example:
   • catalytic converter status,
   • lambda sensor functionality,
   • fuel evaporation system tightness (EVAP).

4. Displaying live data
   The device can display sensor values in real time, such as:
   • RPM – engine revolutions per minute,
   • MAF – mass airflow,
   • ECT – coolant temperature,
   • O2S – lambda sensor voltage.

How to Understand Diagnostic Results
Types of faults by code:
• P-codes – engine and transmission (e.g., P0300),
• B-codes – body, airbags, and climate control,
• C-codes – chassis, ABS, and steering,
• U-codes – communication between control units.
Fault severity:
• Minor faults – do not affect safety but may increase emissions.
• Moderate faults – may negatively affect performance and reliability.
• Serious faults – critical failures that can be dangerous.
Meaning of live data:
For example:
• TPS – throttle position [%],
• IAT – intake air temperature [°C],
• BAT – battery voltage [V].
Knowing these helps in more accurate diagnostics and vehicle condition monitoring.

Why Is Regular Use of Diagnostics Useful?
• Preventing breakdowns – detecting problems early before they worsen.
• Preparing for MOT – checking emission monitors before technical inspection.
• Saving costs – DIY diagnostics reduce service expenses.
• Vehicle overview – data storage allows tracking fault development over time.

SX ONE and SX FIVE – A Smart Choice for Every Driver
SIXTOL SX ONE and SX FIVE diagnostic devices are ideal for beginners and advanced users alike. They offer:
• Czech menu and intuitive operation,
• reliable and fast scanning,
• compact and durable design.
More information and orders at www.sixtol.cz