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<h2>What is the hose connected to the air intake?&nbsp;</h2>
An air intake hose, also called an air cleaner intake hose, is a flexible rubber or plastic tube that connects the air filter box or intake manifold to the throttle body or carburetor of an internal combustion engine. The primary function of an engine air intake hose is to carry fresh, filtered air from the air filter box to the engine to support combustion. Some air intake hoses also contain resonators or silencers to reduce intake noise, while others may incorporate sensors for measuring the air flow or temperature. Air intake hoses are usually made of heat-resistant materials to withstand high engine temperatures and exposure to hot, dry air that passes through the engine bay.
<h2>Air intake hose leak symptoms</h2>
<ul>
<li>Smell of gasoline: A leaky air cleaner intake hose can allow excess air to enter the engine, leading to a rich fuel mixture. This can cause a strong smell of gasoline inside or outside the vehicle.</li>
<li>Dirty air filter: If the engine air intake hose is leaking, dirt and debris can bypass the air filter and enter the engine, causing it to run inefficiently. This can result in a dirty air filter that needs to be replaced more frequently.</li>
<li>Engine hesitation: An air filter hose leak can cause the engine to hesitate or stall when the accelerator pedal is pressed, especially at high speeds.</li>
<li>High-pitched squeal: A leaking air filter intake hose can create a high-pitched squeal or whistling noise as air escapes from the hose.</li>
</ul>
<h2>How to replace the air intake hose?</h2>
An air&nbsp;cleaner&nbsp;intake hose can become cracked, torn, or loose&nbsp;as time goes by, which can affect the engine's performance and fuel efficiency.&nbsp;When you have detected the failure symptoms listed above, you may consider replacing your car&rsquo;s air intake hose.
Refer to the steps below:
<ol>
<li>Locate the air intake hose between the air filter housing and the throttle body or mass airflow sensor.</li>
<li>Loosen the clamps or bolts that hold the old air intake hose in place.</li>
<li>Remove the old air intake hose.</li>
<li>Install the new air intake hose by attaching it to the air filter housing and the throttle body or mass airflow sensor.</li>
<li>Tighten the clamps or bolts to secure the new air intake hose in place.</li>
<li>Start the engine and check for any air leaks or abnormal sounds.</li>
</ol>

Air Intake Hose

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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 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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Vacuum Pump

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Air Filters & Intake Systems

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Camshaft Adjuster

Camshaft Adjuster Cover

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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

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Belt Tensioner

Coolant Level Sensor

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Crankcase Breather Hose

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Crankcase Breather Valve

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Crankshaft Position Sensor

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Engine Oil Dipstick Tube

Engine Oil Filter

Engine Oil Pan Gasket

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Flywheel

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Oil Cooler

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Oil Cooler Line

Oil Filler Cap

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Oil Filter

Oil Filter Base

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Oil Filter Housing

Oil Filter Housing Cover

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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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Glow Plug Relay Module

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Ignition Coil

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Ignition Coils & Spark Plugs Kits

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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 Hose

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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

Emissions Fluid Pump

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Exhaust Fluid Heater

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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 Filter

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Fuel Injection Control Module

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Fuel Injection Pressure Regulator

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Fuel Injector

Fuel Injector Kit

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Fuel Injector Module Wiring Harness

Fuel Line Kit

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Fuel Pump

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Fuel Sending Unit

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Fuel Tank Filler Neck Pipe

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Fuel Tank Strap

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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.

2003 BMW 525i Air Intake Hose

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