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<h2>What is a speed sensor and what does it do?</h2>Imagine driving down a winding road, the wind in your hair and your favorite song playing. But how do you know you're cruising at just the right speed? Enter the speed sensor&mdash;a small yet mighty component that plays a pivotal role in your driving experience. This clever device measures how fast your vehicle is traveling and sends that information to the engine control unit (ECU) and various other systems. Without it, your speedometer would be little more than a decorative dial.But the speed sensor does much more than just keep tabs on your speed. It&rsquo;s like the conductor of an orchestra, ensuring that different parts of your vehicle work in harmony. For instance, in automatic transmissions, speed sensors provide critical data to the transmission control module (TCM). This allows for seamless gear shifts, making your ride smoother and more efficient. And when it comes to safety features like anti-lock braking systems (ABS), the speed sensor is a hero in disguise. It constantly monitors wheel speed, preventing lock-ups during sudden stops and helping you maintain control in slippery conditions.<h2>Types of speed sensors</h2>1. Wheel speed sensors Located at each wheel, these sensors monitor wheel rotation and are vital for ABS and traction control systems.2. Transmission speed sensors Found in the transmission, they measure the speed of input and output shafts, aiding in optimal gear shifting.3. Vehicle speed sensors (VSS) Often mounted on the transmission, they provide overall vehicle speed data to the speedometer and ECU.4. GPS speed sensors Use satellite signals to determine speed, commonly found in navigation systems.<h2>Symptoms of a bad speed sensor</h2>The signs of a bad speed sensor are crucial indicators that can significantly affect vehicle safety and performance. These signs highlight the importance of proactive vehicle maintenance and the need for drivers to be attentive to their car's behavior. Here are the key issues you might encounter:<ul><li>Erratic speedometer: An inaccurate speedometer can lead to unsafe driving practices, as you May not be aware of your actual speed, increasing the risk of accidents.</li><li>Transmission issues: Rough or delayed shifting can indicate deeper transmission problems, which, if left unaddressed, can lead to costly repairs.</li><li>Check engine light: The activation of this light is a crucial alert from the vehicle&rsquo;s diagnostic system. Ignoring it can result in more severe engine or system failures.</li><li>ABS problems: Malfunctions in the ABS can compromise braking safety, making it critical to address speed sensor issues promptly.</li><li>Decreased fuel efficiency: Poor fuel economy affects not only your wallet but also increases emissions, making it an environmental concern.</li></ul>

Speed Sensor

Air Cleaner

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Air Filter Box

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Air Flow Sensor

Air Intake Duct

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Air Intake Hose

Air Intake Manifold Actuator Control Solenoid

Air Intake Manifold Flap Adjuster

Air Intake Manifold Runner Control Sensor

Air Intake Resonator

Electric Vacuum Pump

Engine Air Duct Assembly

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Engine Air Filter

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Intake Manifold

Intake Manifold Flap Actuator

Intake Manifold Repair Bracket

Intake Manifold Runner Control Valve

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Intercooler

Intercooler Hose

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Oxygen Sensor

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Pressure Sensor

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Supercharger Pulley Drive Unit

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Supercharger Snout Rebuild Kit

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Throttle Body

Throttle Cable

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Throttle Position Sensor

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Turbocharger

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Turbocharger Gasket Kit

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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

Camshaft Kit

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Camshaft Timing Gear

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Camshafts

Chain Tensioner Adjuster

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Cylinder Head

Cylinder Head Assembly

Eccentric Shaft Actuator

Engine Timing Belt

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Engine Valve Cover

Engine Valve Cover Gasket

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Harmonic Balancer

Rocker Arm

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Rocker Arm Shaft Lifter Assembly

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Timing Belt Kit

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Timing Chain Gear

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Timing Chain Kit

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Timing Cover

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Timing-Control Valve Solenoid

Valve Cover Gasket

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Valve Lifter Guides

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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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Crank Installer Tool

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Crankcase Breather Hose

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Crankcase Breather Valve

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Crankshaft Position Sensor

Crankshaft Pulley

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Engine Oil Dipstick

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Engine Oil Dipstick Tube

Engine Oil Filter

Engine Oil Pan Gasket

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Flywheel

Harmonic Balancer Crankshaft Hub

Knock Sensor

Oil Baffle

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Oil Cooler

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Oil Cooler Line

Oil Drip Pan

Oil Filler Cap

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Oil Filter

Oil Filter Base

Oil Filter Cover

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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

Oil Separator

Serpentine Belt

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Cranks, Pistons, Oil & Components

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Camshaft Position Sensor

Camshaft Position Sensor & Magnet Kit

Connector Plug

Distributor Cap

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Electronic Ignition System

Engine Valve Covers & Ignition Coils Kits

Glow Plug

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Glow Plug Relay Module

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Ignition Coil

Ignition Coils & Spark Plugs & Wires Kits

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Ignition Coils & Spark Plugs Kits

Ignition Coils & Wires Kits

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Ignition Distributor

Ignition Lock Cylinder

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Ignition Starter Switch

Ignition Switch Actuator

Kill Switch

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

Pulley

Engine Components & Accessories

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Active Grille Shutter Actuator

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Auxiliary Water Pump

Drive Motor Inverter Cooler

Electric Engine Water Pump

Engine Coolant Air Bleeder Valve

Engine Coolant Pipe

Engine Coolant Shut Off Valve

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Expansion Tank

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Expansion Tank Mounting Plate

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Fan Pulley Bracket

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Fuel Cooler

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Overflow Hose Connector

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Radiator

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Radiator Control Fan Module

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Radiator Core Support Skid Bar Plate

Radiator Fan Cooling Motor

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Radiator Hose

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Engine Cooling

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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.

2008 Ford Expedition Speed Sensor

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