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<h2>What does a belt tensioner do?</h2>
Seat belt tensioners represent an integral facet of contemporary automotive safety systems. These sophisticated devices are meticulously engineered to augment passenger protection by mitigating the potentially injurious effects of a vehicular collision or abrupt deceleration event.&nbsp;
<h2>Belt tensioner noise</h2>
Belt tensioner noise is typically an indication of a problem within the engine's accessory drive system, and it should not be ignored.
Squealing or Whining Noise: A common sign of a failing or worn-out belt tensioner is a high-pitched squealing or whining noise. This noise is often most noticeable when you start the engine or when you engage accessories like the air conditioner or power steering.
Rattling or Grinding Noise: A failing tensioner may also produce a rattling or grinding noise, especially at higher engine speeds or when the drive belt is under load.
Intermittent Noise: The noise produced by a failing belt tensioner can be intermittent, depending on factors like engine temperature and load.
<h2>Belt tensioner replacement</h2>
Replacing a belt tensioner is a relatively straightforward mechanical procedure, but it does require some mechanical knowledge and the right tools. Steps to follow when you are planning to replace your seal belt tensioner.
<ol>
<li>Safety first: Ensure the engine is off, and the vehicle is secure. Disconnect the battery if necessary.</li>
<li>Locate tensioner: Find the belt tensioner, usually a pulley on a bracket with a spring-loaded arm.</li>
<li>Release belt tension: Use the right tool to rotate the tensioner arm, relieving tension on the drive belt.</li>
<li>Remove belt: Carefully slide the belt off the pulleys. Note routing for reference.</li>
<li>Remove old tensioner: Unbolt the old tensioner, keeping track of the hardware.</li>
<li>Install new tensioner: Place the new tensioner in the same spot and secure it with bolts. Align it correctly.</li>
<li>Reinstall belt: Put the belt back on the pulleys, ensuring proper alignment.</li>
<li>Adjust tension: Use the tool to apply tension and follow the manufacturer's specs.</li>
<li>Double-check: Confirm belt alignment and tension on all pulleys.</li>
<li>Test: Start the engine, listen for issues, and check belt movement.</li>
<li>Reconnect battery: If disconnected earlier, reconnect the vehicle's battery.</li>
<li>Dispose of old parts: Properly dispose of the old tensioner and parts.</li>
</ol>

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Air Filter Box

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Air Flow Sensor

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Air Intake Duct

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Air Intake Hose

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Air Intake Manifold Actuator Control Solenoid

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Air Intake Manifold Flap Adjuster

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Air Intake Manifold Runner Control Sensor

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Electric Vacuum Pump

Engine Air Duct Assembly

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Engine Air Filter

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Intake Manifold

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Intake Manifold Flap Actuator

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Intercooler

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Oxygen Sensor

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Pressure Sensor

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Throttle Body

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Throttle Position Sensor

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Turbocharger

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Turbocharger Oil Line

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Air Filters & Intake Systems

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Camshaft Adjuster

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Camshaft Timing Gear

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Camshafts

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Engine Valve Cover

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Harmonic Balancer

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Timing Belt Kit

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Timing Chain Kit

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Timing Cover

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Timing-Control Valve Solenoid

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Valve Lifters Tappet

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Cams, Timing & Valvetrain

Coolant Level Sensor

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Crankshaft Position Sensor

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Engine Oil Dipstick Tube

Engine Oil Filter

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Flywheel

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Oil Cooler

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Oil Cooler Line

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Oil Filter

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Oil Filter Housing

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Oil Level Sensor

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Oil Pan

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Oil Pump

Oil Pump Drive Gear Shaft

Oil Pump Pickup Tube

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Cranks, Pistons, Oil & Components

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Camshaft Position Sensor

Camshaft Position Sensor & Magnet Kit

Connector Plug

Distributor Cap

Engine Valve Covers & Ignition Coils Kits

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Ignition Coil

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Ignition Distributor

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Ignition Starter Switch

Ignition Switch Actuator

Knock Detonation Sensor

Relay

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Spark Plug

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Spark Plug Wire

Electronic Control Modules, Ignition & Distributors

Engine Wiring Harness

Intake Manifold Repair Kit

Engine Components & Accessories

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Auxiliary Water Pump

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Expansion Tank

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Expansion Tank Mounting Plate

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Fuel Cooler

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Radiator

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Radiator Support Assembly

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Temperature Sensor

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Turbo Hose

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Water Coolant Pipe

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Water Outlet

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Engine Cooling

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Engine Mount

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Engine Mounts

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Catalytic Converter

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EGR Valve

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Exhaust Gas Temperature Sensor

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Exhaust Manifold

Fuel Tank Breather Valve

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Fuel Vapor Leak Detection Pump

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Nitrogen Oxide Sensor

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Secondary Air Injection Check Valve

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Vapor Canister Vent Solenoid

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Exhaust & Emission Systems

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Fuel Injection Pressure Regulator

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Fuel Injector

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Fuel Injector Module Wiring Harness

Fuel Line Kit

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Fuel Pump

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High Pressure Fuel Pump

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Fuel Systems & Components

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The engine comprises many essential elements such as the lower cylinder block, upper cylinder head(s), and the cooling & lubricating systems. With A-Premium aftermarket engine components, you can expect that your engine deliver years of reliable performance. We offer a diverse selection of engine components from air filters and ignition coils (kits) to fuel pumps to cater to your needs.

2009 Audi a4%20quattro Belt Tensioner

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