Does a broken flexi pipe cause the engine check light to glow?

The flex pipe plays an important role in the exhaust system of a car. It allows for flexibility in the exhaust system, and cushions the movement and vibrations from the engine during acceleration. This helps to prevent cracks from developing in the exhaust pipe. It is typically made of stainless steel that allows the exhaust line to move with the vehicle while maintaining its shape. 

Unfortunately, like all mechanical components, it can become damaged over time. If you suspect your flexi pipe is in need of repair, it’s important to address the issue as soon as possible because a damaged flexi pipe can cause significant problems.

One of the most common symptoms of a broken flexi pipe is a glowing engine check light. 

Reasons behind glowing engine check light

A damaged flexi pipe can cause a vacuum leak, which can affect the engine’s air-fuel ratio. This happens because the vacuum leak allows air to enter the engine without passing through the throttle body, which is responsible for controlling the amount of air that enters the engine. As a result, the engine is unable to properly control the air-fuel ratio, which is crucial for proper combustion and performance.

The engine’s computer system, known as the Engine Control Unit (ECU), is responsible for monitoring the engine’s performance. If the ECU detects a problem with the air-fuel ratio, it will trigger the engine check light to glow as a warning to the driver. The engine check light warns that something is wrong with the engine and requires attention. In the case of a damaged flexi pipe, the engine check light will likely come on because of the vacuum leak caused by the damaged pipe.


If your engine check light comes on due to a damaged flexi pipe, it is important to have the car inspected by a professional as soon as possible. A professional mechanic will be able to diagnose the problem, determine the cause of the engine check light and suggest appropriate flexi pipe repair

In many cases, replacing the damaged flexi pipe will resolve the issue and turn off the engine check light. If the engine check light stays on even after the flexi pipe has been replaced, it is possible that there is another problem with the engine that needs to be addressed.

Remember, a glowing engine check light is a warning sign that something is wrong with your engine and requires attention, so don’t ignore it ever!


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