BMW exhaust silencer replacement

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What does an exhaust silencer do?

A car’s exhaust system is made up of several parts that channel gases from the engine’s cylinders back into the atmosphere. The exhaust silencer is the final section, and its job is to reduce the amount of noise created by the engine gases being forced through the exhaust pipe.

How often should an exhaust silencer need replacing?

Your exhaust silencer’s lifespan is dependent on a range of outside factors—the main ones being the weather and driving conditions. Modern exhausts made from chrome or stainless steel are designed to last for the life of the car, whereas a high-quality non-stainless steel exhaust should last for around 5 years.

The law, vehicle regulations and your MOT

A hole in your exhaust will only fail an MOT if it is responsible for a major leak or it causes the car to fail its emissions test.

What happens when we replace your exhaust silencer?

• Our efficient and fully qualified mechanics will inspect your exhaust.
• If the exhaust silencer is damaged, cracked or rusted, it will be replaced, and you’ll be advised of any other connected or associated problems arising from its malfunction.
• You will also be advised of any other parts that may need to be replaced, for example, the exhaust gaskets, for the best operation and health of your vehicle.
• Once the exhaust silencer has been replaced, our mechanics will test it thoroughly to ensure its correct operation and make any adjustments required for its best performance.

What causes an exhaust silencer to stop working correctly?

Because of their location, being mounted underneath the car, **exhaust pipes **are highly prone to damage, corrosion and wear. The weather plays a significant part in the corrosion and deterioration of the different exhaust pipe sections; rust being a major player in the appearance of holes throughout the system.

Damage to exhausts can be caused by raised road elements or extrusions from the road, such as curbs or speed bumps. Damage can also occur by driving too fast over the brow of a hill or through a dip where the suspension might bottom out and cause contact between the underside of the vehicle and the road surface.

Symptoms of a malfunctioning exhaust silencer

A noisy exhaust

If your exhaust makes more noise or is louder than normal, your exhaust silencer is probably damaged or improperly attached. A common sound of ‘blowing out’ is where holes have developed in the silencer.

There are holes in the exhaust

If you can see holes developing in your exhaust, through damage or deterioration, it’s time to get a new exhaust silencer.

Excessive vibration and lack of performance

A damaged exhaust pipe can affect your vehicle’s performance, and in some circumstances develop a vibration that wouldn’t occur under normal operation.

Failure of an emissions test

The exhaust is responsible for vehicle emissions, so if you fail a test, on inspection or at MOT, then you need to replace the malfunctioning component immediately.

BMW

BMW AG is a German automobile and motorcycle manufacturer that was established over 100 years ago in March 1916. They also own Mini and Rolls Royce, after taking over the two British marques in 2000 and 1998 respectively.

How popular is BMW in the United Kingdom?

BMW makes luxury vehicles and is possibly most famous for its sports saloon models. In 2018, BMW had 1.9m vehicles on the roads in the UK, a number that has been steadily increasing each year for the past decade.

As one of the ‘big 3’ German marques, along with Audi and Mercedes, BMW carries a strong reputation for making high-quality stylish vehicles, and have captured a large section of the UK market.

Luxury family and business models for every driver

Probably most popular for the 3 Series and 5 Series saloon models, BMW has got every possible angle covered for the more discerning drivers.

The full range includes everything from the 1 Series city car to the full-size saloons and sports coupes of the 7 and 8 Series models.

To provide everything you’d ever need for family motoring there’s a seven-seat MPV, their range of X model SUVs, and since 2014, the introduction of their plug-in electric i models. Top it all off with their M model high-performance supercars, the Z4 convertible and the i8 Roadster—and you’ve got the full package.

BMW: High performance on and off the track

BMW has a successful history in a range of motorsports.

They have been significant performers in touring car racing and rally driving, enjoyed success in Formula One with the BMW Sauber team, and BMW cars have been regular competitors and winners at Le Mans since the race’s early years.

BMW’s reliability and reputation

BMW ranked 16th place out of 30 car brands in the What Car? Reliability Survey in 2018. BMW hasn’t always had the best reputation for reliability but to rank alongside marques such as Honda, Volkswagen and Fiat they’re holding their own alongside plenty of the other big names.

Recent BMW recalls and reliability issues

Various recalls have been made on BMW models throughout their motoring history. The following are a list of the most recent in the UK and Europe.

22/03/2019 – BMW X5 (2018)

Incorrect tightening torque of left front seat fixing bolts

22/03/2019 – BMW X5, 5 Series (2000–2003)

Potential rupture of driver front airbag inflator

04/03/2019 – BMW X1 (2018–2019)

Rear lights may be fixed with incorrect securing units

01/03/2019 – BMW X5, X6, 7 Series, 6 Series and 5 Series (2009–2011)

Auxiliary water pump’s electronics could lead to a short circuit

01/02/2019 – BMW X5 and X6 (2007–2010)

The idler pulley bolt could become loosened

21/01/2019 – BMW M3, M4 and M4 convertible (2016)

The flange of the propshaft may become detached

27/12/2018 – BMW X6 (2014–2015)

EGR module cooler could leak

27/12/2018 – BMW 4 Series (2013–2015)

Exhaust gas recirculation module cooler could leak

All recall information sourced from gov.co.uk data.