Skip the auto shop - Our mechanics make house calls

Q: What are the seat belt pretensioners?

asked by on

What are the seat belt pretensioners?

Your seat belts are much more advanced than what you might expect. They’re more than just webbed belts that hold you in place statically. They’re dynamic components of your safety system. One of the most important parts of your seat belt system is the pretensioner. There’s one on the driver front seat belt and the passenger front seat belt.

The pretensioners are responsible for tightening the seat belt after the retractor lets the belt out a little bit during an impact. This holds you more tightly in the seat and provides better safety during severe impacts.

Tip

The seat belt pretensioners should be inspected after all accidents, and replaced if necessary (they’re designed only for one-time use).

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: What is the correct pressure for my spare and how should I maintain it?

If you don’t have to use your spare tire regularly, it’s easy to forget it’s even there. However, you need to keep an eye on it. You should check the pressure regularly (at least once a month), and maintain it...

Q: Fuel pump

This may happen when the fuel pump is working intermittently or not maintaining the proper fuel pressure. This may also be related partially to the fuel pressure regulator which helps to maintain the proper fuel pressure throughout the system. When...

Q: How do you operate the moon roof?

If your SUV has a moon roof, it provides you with another means to vent the interior, to let in fresh air, and to let in more light. It’s also designed to be simple to use, but there are a...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...