Engine Sensors, Relays, Switches
- ACP®Camshaft Position SensorCamshaft Position Sensor by ACP®. Looking for reliable parts for your vehicle? Then ACP products are for you. They are made to meet or exceed OEM standards while maintaining the original factory look. ACP works with the latest in...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$22.30 - $25.70
- ACP®Oil Pressure Sending Unit ExtensionOil Pressure Sending Unit Extension by ACP®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$33.47
- Aisan®Camshaft Position SensorCamshaft Position Sensor by Aisan®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from industry-leading...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$35.78 - $38.31
- Aisan®Crankshaft Position SensorCrankshaft Position Sensor by Aisan®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect fit...OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price$30.95 - $74.80
- Autotecnica®Camshaft Position SensorCamshaft Position Sensor by Autotecnica®. Designed utilizing the latest technology, this product features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or...OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price$13.01 - $23.85
- Autotecnica®Crankshaft Position SensorCrankshaft Position Sensor by Autotecnica®. Designed utilizing the latest technology, this product features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or...OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price$7.31 - $27.38
- Autotecnica®Engine Oil Pressure SwitchEngine Oil Pressure Switch by Autotecnica®. Designed utilizing the latest technology, this product features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to meet or...Made with precision and quality in mindDesigned to meet your specific needs$4.85 - $30.73
- Holstein®Engine Crankshaft Position SensorEngine Crankshaft Position Sensor by Holstein®. The Crankshaft Position Sensor is an electronic device that monitors the position and/or rotational speed of the crankshaft. This sensor communicates with the vehicle's ECU to control...Holstein focuses on using only the highest quality materials,Manufactured to exacting standards for an aftermarket product that is truly built to match or exceed the OE part$9.45 - $148.25
- Holstein®Oil Pressure SwitchOil Pressure Switch by Holstein®. Global coverage of European, Asian, and Domestic vehicles. OE Replacement Parts You Can Trust. The Variable Valve Timing Solenoid alters the supply of oil pressure to the camshaft depending on the speed...Holstein focuses on using only the highest quality materialsManufactured to exacting standards for an aftermarket product that is truly built to match or exceed the OE part$11.76 - $38.57
- Omix-ADA®Camshaft Position SensorCamshaft Position Sensor by Omix-ADA®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect...Same specs as OEM, for OEM style performanceWorks with stock valvetrain$54.52 - $117.26
- Omix-ADA®Crankshaft Position SensorCrankshaft Position Sensor by Omix-ADA®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect...Same specs as OEM, for OEM style performanceWorks with stock valvetrain$31.80 - $117.26
- Omix-ADA®Oil Pressure SensorOil Pressure Sensor by Omix-ADA®. Perfect for your vehicle and lifestyle, it is manufactured to meet or exceed stringent industry standards.Performs according to OEM specificationsMeets or exceeds OEM quality standards$14.64 - $146.57
- Professional Parts Sweden®Camshaft Position SensorCamshaft Position Sensor by Professional Parts Sweden®. If you need premium-quality yet affordable replacement parts for your Volvo or SAAB, Professional Parts Sweden hits the spot. Top-of-the-line Professional Parts Sweden products are...Direct replacement for your factory partEngineered to meet exact OEM standards$38.36 - $44.97
- Professional Parts Sweden®Crankshaft Position SensorCrankshaft Position Sensor by Professional Parts Sweden®. If you need premium-quality yet affordable replacement parts for your Volvo or SAAB, Professional Parts Sweden hits the spot. Top-of-the-line Professional Parts Sweden products...Direct replacement for your factory partEngineered to meet exact OEM standards$21.47 - $38.88
- Vemo®All-Wheel-Drive Coupling SensorAll-Wheel-Drive Coupling Sensor by Vemo®. Grade: Aftermarket. Vemo products are made by high-quality materials and undergo strict quality tests. They are, thereby, the perfect alternative to the original part.Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$269.93
- Vemo®Boost Pressure SensorBoost Pressure Sensor by Vemo®. Is your vehicle feeling down on power? Do you see dark puddles on the ground when you park? Is your CHECK ENGINE light on? Your engine may be in need of repair, but before you waste your time and gas...OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price$36.58 - $129.06
- Vemo®Camshaft Position SensorCamshaft Position Sensor by Vemo®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from industry-leading...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$15.37 - $205.00
- Vemo®Crankshaft Position SensorCrankshaft Position Sensor by Vemo®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect fit...OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price$14.70 - $371.66
- Vemo®Engine Management RPM sensorEngine Management RPM sensor by Vemo®. Grade: Aftermarket. Plug (Connector): 2 Pins. Vemo products are made by high-quality materials and undergo strict quality tests. They are, thereby, the perfect alternative to the original part.Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$42.09 - $81.87
- Vemo®Neutral Position SensorNeutral Position Sensor by Vemo®. Automatic Transmission. Vemo products are made by high-quality materials and undergo strict quality tests. They are, thereby, the perfect alternative to the original part.Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$49.22 - $369.58
- Vemo®Odometer SensorOdometer Sensor by Vemo®. Grade: Aftermarket. Vemo products are made by high-quality materials and undergo strict quality tests. They are, thereby, the perfect alternative to the original part.Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$21.69 - $30.05
- Vemo®Oil Pressure Regulating ValveOil Pressure Regulating Valve by Vemo®. Vemo products are made by high-quality materials and undergo strict quality tests. They are, thereby, the perfect alternative to the original part.Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$37.54 - $386.69
- Vemo®Oil Pressure SenderOil Pressure Sender by Vemo®. When you need a headlight bulb or a stop light switch, you may be tempted to just run down to the local auto parts chain store. But before you waste your time and gas only to find high prices and poor...OE quality fluids from top original equipment and aftermarket manufacturersThe finest quality at a great price$6.74 - $98.19
- Vemo®Oil Pressure SensorOil Pressure Sensor by Vemo®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect fit for a...Made with precision and quality in mindDesigned to meet your specific needs$22.98 - $181.04
- Vemo®Oil Pressure SwitchOil Pressure Switch by Vemo®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a perfect fit for a...OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price$4.29 - $620.08
- Vemo®Tyre Pressure Control System Wheel SensorTyre Pressure Control System Wheel Sensor by Vemo®. Grade: OE. Vemo products are made by high-quality materials and undergo strict quality tests. They are, thereby, the perfect alternative to the original part.Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$57.50 - $2,847.87
- Vemo®Urea Injection NOx SensorUrea Injection NOx Sensor by Vemo®. Grade: Q+. Vemo products are made by high-quality materials and undergo strict quality tests. They are, thereby, the perfect alternative to the original part.Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$462.52 - $1,150.34
- World Source One®Crankshaft Position SensorCrankshaft Position Sensor by World Source One®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability. Designed to provide a...Made with precision and quality in mindDesigned to meet your specific needs$12.10 - $68.81
- Eurospare®Camshaft Position SensorCamshaft Position Sensor by Eurospare®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$27.80 - $199.58
- Eurospare®Crankshaft Position SensorCrankshaft Position Sensor by Eurospare®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$29.60 - $78.84
During vehicle operation, an assortment of sensors, senders, and switches sends voltage signals to an engine control system computer, called the Powertrain Control Module (PCM) or Engine Control Module (ECM). These voltage signals indicate engine load, vehicle speed, temperature, and other variables, and the computer uses the information to control the air/fuel mixture, ignition timing, emissions devices like the EGR valve, and dash indicators.
The oxygen (O2) sensor compares the oxygen content of the exhaust with the oxygen present in atmosphere and varies the voltage signal sent to the PCM/ECM accordingly. The computer uses the information to control fuel flow to maintain the air/fuel ratio for optimal performance, and lowest emissions. There are at least two O2 sensors, one located in the exhaust stream before the catalytic converter, and one afterward, also known as the catalyst monitor.
To know when to inject fuel and fire the spark plugs, the PCM/ECM needs to know the position of the valves in relation to the pistons and the rotational speed of the crankshaft. The Camshaft Position (CMP) sensor and Crankshaft Position (CKP) sensor provide these signals. Ignition timing is further controlled through the Knock Sensor (KS), which sends a voltage signal to the computer if vibration caused by detonation is detected, enabling the computer to retard spark advance and prevent engine damage.
The Throttle Position Sensor (TPS) signals the computer the position of the throttle shaft, indicating how fast you want to go. The PCM/ECM uses this information along with the Mass Air Flow (MAF) sensor signal, to calculate engine load, with increased load requiring more fuel. The Engine Coolant and Intake Air Temperature, supplied by the ECT and IAT sensors respectively, enable the computer to richen the mixture and increase spark advance when the engine is cold and then lean it out and retard timing as the engine warms up. Cooling fan operation and EGR valve opening also rely on temperature signals to the computer.
The Power Steering (PS) switch and A/C sensor signal the computer that there is increased load from power steering pump (such as during parking maneuvers) and A/C compressor operation, so the PCM/ECM can raise idle speed to prevent stalling. A brake switch can signal the computer to turn off the cruise control or disengage the torque converter clutch. The PCM/ECM also controls the dash gauges on modern vehicles, relying on input from an oil pressure sender, the Vehicle Speed Sensor (VSS), and the ECT sensor. Charging system operation, and the related dash gauge or warning light, are also controlled by the PCM/ECM.
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