Common exhaust problems you need to be aware of

However, like all parts of your car, the exhaust system can experience wear and tear over time, leading to potential issues that can affect the performance of your vehicle.

Whether it's a minor issue or a more serious problem, recognising common exhaust problems early can save you from costly repairs and help maintain your vehicle’s efficiency.

As part of your overall car maintenance, it's important to address exhaust problems promptly to ensure your vehicle remains safe, efficient, and environmentally friendly.

Exhaust problems

Exhaust systems in vehicles play a critical role in reducing harmful emissions and improving engine performance. Here are some common exhaust problems that drivers may encounter:

Leaking exhaust pipes

Over time, exhaust pipes can corrode or develop holes due to exposure to heat, moisture, and road salt. A leaking exhaust pipe can reduce engine performance, cause excess noise and lead to increased emissions – a leading cause of MOT failure.

Faulty oxygen sensor

Oxygen sensors monitor the amount of oxygen in the exhaust gases to help the engine control module adjust fuel-to-air ratios for optimal engine performance. A faulty sensor can result in poor fuel economy, rough idling, and increased emissions.

Clogged catalytic converter

The catalytic converter helps reduce harmful emissions by converting toxic gases into less harmful ones. If it becomes clogged or damaged, it can cause engine misfires, reduced power, and increased fuel consumption.

Exhaust manifold leaks

The exhaust manifold channels gases from the engine cylinders to the exhaust system. A leak in the manifold can lead to poor engine performance, increased fuel consumption, and potentially even engine damage if not addressed.

Excessive exhaust smoke 

Excessive smoke coming from the exhaust may indicate several issues, such as oil burning (blue smoke) or coolant leaking into the engine (white smoke). This can signal major engine problems and should be inspected immediately.

Poor engine performance

Exhaust system issues can lead to reduced engine performance, including a loss of power, rough idling, or poor acceleration. Problems like a clogged catalytic converter or exhaust leaks can directly impact the engine's efficiency.

Strange noises

A hissing or popping noise coming from the exhaust can signal a leak or a problem with the exhaust manifold.

Loud or rumbling noises may indicate an issue with the exhaust pipe itself – perhaps there is a whole, or the exhaust system has broken free of its mountings.

If you experience any of these issues in the exhaust system, then it can trigger the vehicle's check engine light. If this occurs, take your vehicle to a trusted local garage.

What is exhaust blowing?

Exhaust blowing refers to when gases escape from the exhaust system in an abnormal or uncontrolled manner, typically due to external damage or wear in the components of the system.

It often involves the release of gases through holes, cracks, or weak points in the system, such as the exhaust manifold, pipes, or catalytic converter.

If you suspect exhaust blowing, it's important to have the system inspected and repaired promptly to avoid causing further issues and potentially being stopped by the police due to excessive noise or smoke.

Visit a trusted local garage to get your exhaust repaired.

• Car dashboard warning lights guide
• What come out of a car’s exhaust?
• Engine smoking – why is it happening? And what should you do about it?

Can you repair a blowing exhaust?

Yes, a blowing exhaust can be repaired, and the process will depend on the severity and location of the issue.

If the damage is too severe, then the exhaust will need to be replaced.

However, if there is a minor issue, then it can be repaired.

Normally, the first step in repairing a blowing exhaust is to identify the source of the leak. This can often be done by checking the exhaust system for visible cracks, holes, or rust spots.

If you have a small hole, you can use high-temperature exhaust tape or a repair sleeve as a temporary solution.

These products can seal up the leak but are not permanent fixes.

For larger holes, the damaged section of the exhaust pipe may need to be replaced.

Sometimes smaller holes can be temporarily fixed with a patch kit.

If the leak is around the exhaust manifold, check if any bolts are loose. Tightening or replacing the bolts may solve the issue.

However, if rust has caused a section of the exhaust system to deteriorate beyond repair, that section will need to be replaced. Rust can affect both the pipes and other components, so speaking to mechanic is vitally important.

How much is a new exhaust?

According to whocanfixmycar, the average cost to fit a new exhaust or replace your existing one, is around £135. This includes parts and labour.

However, the actual price varies on the make, model, age, and type of exhaust.