Exhaust repairs can be a tricky subject for drivers to understand as there as so many problems which could arise as well as a variety of symptoms which point to different issues.

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The costs involved with exhaust repair can be just as confusing as a hole in one part of the system can be drastically more expensive than a similarly sized one in a different part of the system.

To help you decipher the price of exhaust repair and what the signs of a problematic exhaust are, we have created this simple guide.

Why is white, blue or black smoke coming from my exhaust?

white smoke from exhaust

If you have realised that the colour of smoke coming from your exhaust is different than usual, there is a high possibility that there is an issue somewhere within the system, however, the colour of the smoke itself will give you a clue what the specific issue may be.

Why white smoke from an exhaust?

If white smoke is coming from your exhaust, your car could be low on engine coolant from the result of a cracked or warped cylinder head, a cracked engine block or a head gasket failure from overheating.

If engine coolant gets anywhere near the combustion chamber, the liquid will be vaporised and converted into a white gas which is then pushed out through the tailpipe.

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Why black smoke from an exhaust?

Black smoke coming from your exhaust means that your engine is burning more fuel than it should. This is often caused by a problem with your fuel injectors, air filter or fuel-pressure regulator. Alternatively, the fuel line could be clogged. Burning excessive fuel will have a noticeable effect on fuel economy meaning that you will be spending much more money getting from A-B.

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Why blue smoke from an exhaust?

If your exhaust in pumping out blue smoke, oil will have leaked into the engine and been burned in the system. This happens following the valve guide seals or piston rings wearing out and allowing engine oil into the combustion chamber. Engine oil is only meant for the lubrication of parts which are in constant contact with each other.

If engine oil is leaking into the combustion system, you need to have the issue addressed with an oil change immediately as low engine oil levels will be incredibly detrimental to your car.

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Exhaust leaks

exhaust crack

If there is a leak somewhere along the piping and fumes are escaping, this could pose a very serious danger to you and the passengers your car. If the leak is located at a point before the catalytic converter, it will be toxic to humans and if inhaled, will cause health problems.

That is why it is critical that you take your car to a mechanic if your car starts to fill with smoke, obviously!

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Cracked or broken exhaust

There are a number of signs that you can look out for that point to an issue with your exhaust.

If you see any of the following, get quotes from WhoCanFixMyCar immediately and tell us what your car is doing!

Roaring Noise from exhaust

Your exhaust will emit a loud roaring noise if the silencer has been corroded by acidic moisture in the system.

Hissing Noise from exhaust

A crack or hole will have opened up on the piping if you can hear a hissing noise as the fumes escape into the atmosphere.

Leaking Water from exhaust

If your cars head gasket is in trouble, water may leak from the part onto the exhaust and then to the ground so if you find this issue, it may cost quite a lot to repair as is accepted for head gasket repair.

Popping or Rattling exhaust

This will come from the result of a bracket becoming loose and not being able to hold the piping in place properly.

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Exhaust repair cost

RegionAverage Cost
Vauxhall£111.01
Ford£109.84
Peugeot£112.09
BMW£149.14
Toyota£137.20
Volkswagen£144.81
Mini£132.85
Citroen£110.27
Nissan£83.77
Renault£133.95

It can be incredibly difficult to deliver a perfectly accurate estimate for repair until a mechanic is able to get a close look at your car as the repair could be as simple as welding a small crack shut which costs £50 or replacing the entire catalytic converter which could cost £1,500+.

Therefore, the only way to get an accurate estimate is by getting in touch with the best local mechanics using WhoCanFixMyCar here.

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