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The Check Engine Light is a part of the onboard diagnostics system (OBD) in modern vehicles that monitors various systems and sensors to ensure they are operating within specified parameters.
When the Light comes on, it typically means that the vehicle's computer, known as the Engine Control Module (ECM) or Powertrain Control Module (PCM), has detected a fault or an abnormality in one of the monitored systems, ranging from minor issues such as a faulty sensor to more significant problems like a malfunctioning catalytic converter or engine misfire.
When the Check Engine Light comes on, the vehicle may still operate normally, while in other instances, it may enter a reduced power mode (limp mode) or experience performance issues.
It's worth noting that while the Check Engine Light indicates that a problem has been detected, it doesn't necessarily pinpoint the exact cause.
Proper diagnosis using a scan tool is crucial to identify and resolve the underlying issue accurately.
Ignoring the Check Engine Light or delaying repairs may lead to further damage or decreased fuel efficiency, so it's best to address it promptly.
(Inset: Air-fuel Ratio Sensor)
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A car battery is a rechargeable electrochemical device that converts chemical energy into electrical energy to power the electrical systems in a car.
It is typically a lead-acid battery, which consists of several cells containing lead plates immersed in an electrolyte solution of sulfuric acid and water.
When a car is started, the battery provides the electrical energy needed to turn the starter motor and crank the engine.
As the engine runs, the alternator takes over and generates electrical energy to power the car's electrical systems and to recharge the battery.
The basic process of how a car battery works involves a chemical reaction between the lead plates and the electrolyte solution.
The sulfuric acid in the electrolyte solution reacts with the lead plates, causing a flow of electrons between the positive and negative terminals of the battery.
This flow of electrons creates an electrical current that can be used to power the car's electrical systems.
Over time, the chemical reaction can cause the lead plates to deteriorate and the electrolyte solution to become depleted, which can reduce the battery's ability to hold a charge.
Proper diagnosis is key to any repair or replacement.
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During tire change, the Lug Studs remain on the hub(apart from some German vehicles).
Lug nuts are used to secure the wheel by fastening them on the wheel studs.
It is important to replace the studs when they break or damage threads.
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