what do these Vehicles have in common?

The Check engine light is on: 

A Check Engine Light typically indicates that there's a problem with the vehicle. However, it could also mean that the Gas Cap is loose or that the car needs an Oil Change. Driving with the Check Engine Light on is never the best idea. Either way, it's best to take the car to a Mechanic to get it checked out. https://www.ricksautoservice.org/appointments

• The Air Filter is dirty or clogged.  

The Air Filter in my car is dirty or clogged. This can lead to reduced performance and fuel efficiency. It's important to replace the air filter regularly to keep your car running at its best.

• The Catalytic Converter isn't working properly.

The Catalytic Converter is an important part of a car's Emissions system. Unfortunately, if it isn't working properly, it can cause all sorts of problems. You might notice your car's Engine running roughly, or that it's losing power. If you think there might be something wrong with your catalytic converter, it's best to get it checked out by a Mechanic.

• There's a problem with the Oxygen Sensor.

When you operate your vehicle, the Oxygen Sensor becomes coated with Combustion byproducts. This can affect the sensor's ability to function properly, and may cause your vehicle to emit higher levels of Exhaust.

• The Exhaust Manifold is leaking.

The Exhaust Manifold is responsible for collecting and directing Exhaust gases away from the Engine. However, if it becomes damaged or worn, it can start to leak. This can lead to engine problems, so it's important to get it fixed as soon as possible.

• The Spark Plugs aren't firing correctly.

The Spark Plugs in your car are responsible for igniting the Gasoline in the Engine. If they're not firing correctly, your car won't run properly.

• There's a Vacuum Leak somewhere in the engine system.

A Vacuum Leak is an abnormal flow of air into or out of an Engine. This can cause a decrease in power and Fuel Economy. If you suspect there is a vacuum leak somewhere in your engine system, it's important to have it checked out by a mechanic as soon as possible.

• The Evaporative Emission Control System isn't working properly.
• The Evaporative Emission Control System (EVAP) is a critical component of your engine. Its job is to prevent fuel vapors from escaping into the atmosphere, and it's important for both environmental and performance reasons.

• You need to get your vehicle serviced by a qualified Mechanic.