Ignition Relays, Sensors & Switches
- Holstein®Ignition Knock Detonation SensorIgnition Knock Detonation Sensor by Holstein®. OE Replacement Parts You Can Trust. The Knock Sensor is able to detect mechanical stress and produces a voltage when the car knocks or pings. Under heavy acceleration, it sends signals to...Holstein utilizes only premium materials to ensure durability and reliable serviceGlobal coverage of European, Asian, and Domestic vehicles$7.66 - $188.94
- MTC®Ignition Knock SensorIgnition Knock Sensor by MTC®. If you’re looking for replacement parts at reasonable prices, then MTC parts are the way to go. Manufactured by highly qualified experts who follow stringent quality standards, these parts perform and...Ideal solution to restore the performance of your vehicleManufactured using high-strength materials for maximum reliability$17.96 - $69.91
- Mando®Ignition Knock Detonation SensorIgnition Knock Detonation Sensor by Mando®. At their online store you can get this superior replacement product and take advantage of its impeccable design. Carefully engineered to OE specifications, it exactly replicates the factory...Manufactured from premium materialsDesigned to provide years of reliable service$44.42
- Mitsubishi Electric®Ignition Knock Detonation SensorIgnition Knock Detonation Sensor by Mitsubishi Electric®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$12.76 - $35.85
- Santech®Ignition Knock SensorIgnition Knock Sensor by Santech®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the same or...Constructed from superior materialsMade to match OE specifications$21.71 - $98.14
- Vemo®Ignition Knock Detonation SensorIgnition Knock Detonation Sensor by Vemo®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$26.08 - $318.39
- Dorman®Ignition SwitchIgnition Switch by Dorman®. An essential replacement item, Dorman's Ignition Power Switch enables your engine to turn over upon startup, restoring drivability. It also unlocks the power accessories. The Switch is engineered from...This part has undergone a rigorous quality inspection to ensure high qualityIncludes bezel for a complete repair$14.99 - $136.10
- Standard®Tru-Tech™ Ignition Control ModuleTru-Tech™ Ignition Control Module by Standard®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and...OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price$19.33 - $171.67
- ACDelco®Genuine GM Parts™ Ignition SwitchGenuine GM Parts™ Ignition Switch by ACDelco®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$13.29 - $145.17
- TRQ®Ignition Control ModuleIgnition Control Module by TRQ®. Looking for a new ignition control module to replace your factory component and make your vehicle perform great again? Consider this high-quality part available at a fair price. It is built to meet or...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$22.03 - $71.73$23.95 - $73.95Save up to 8%
- Standard®Intermotor™ Ignition Control ModuleIntermotor™ Ignition Control Module by Standard®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$36.72 - $963.89
- Motorcraft®Ignition Control ModuleIgnition Control Module by Motorcraft®. Motorcraft is the way to restore the performance of your vehicle. Designed specifically for your vehicle, Motorcraft products meet stringent Ford Motor Company standards and feature OEM quality...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$60.86 - $228.32
- Mopar®Wireless Ignition ModuleWireless Ignition Module by Mopar®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the same or...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$14.23 - $834.98
- Standard®Ignition Control ModuleIgnition Control Module by Standard®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the same...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$33.09 - $1,392.41
- Standard®Tru-Tech™ Ignition SwitchTru-Tech™ Ignition Switch by Standard®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$12.33 - $64.65
- Mopar®Ignition SwitchIgnition Switch by Mopar®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the same or even...OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price$2.30 - $539.78
- ACDelco®Genuine GM Parts™ Ignition Control ModuleGenuine GM Parts™ Ignition Control Module by ACDelco®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$21.98 - $260.88
- Standard®Ignition Knock Detonation Sensor ConnectorIgnition Knock Detonation Sensor Connector by Standard®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$12.94 - $41.54
- ACDelco®GM Original Equipment™ Ignition Knock Sensor ConnectorGM Original Equipment™ Ignition Knock Sensor Connector by ACDelco®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$15.57 - $95.18
- ACDelco®GM Original Equipment™ Ignition SwitchGM Original Equipment™ Ignition Switch by ACDelco®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$13.06 - $138.53
- ACDelco®Professional™ Ignition Control ModuleProfessional™ Ignition Control Module by ACDelco®. Many ACDelco Ignition Modules feature electronically welded lead connections to help eliminate heat-stress failure or cold joints. Select ACDelco Ignition Modules have been laser...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$48.45 - $276.65
- Motorcraft®Glow Plug SwitchGlow Plug Switch by Motorcraft®. Is your vehicle hard to start? Does it miss under load and idle rough? Is your gas mileage not what it used to be? Your ignition system may need repair, but before you waste your time and gas running out...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$49.50 - $355.76
- Delphi®Ignition Control ModuleIgnition Control Module by Delphi®. Delphi OE technology ignition products are validated to match the vehicles system. OE quality replacement parts for the right fit, form and function. Designed utilizing the latest technology, this...Wide-ranging domestic and import coverageDeveloped based on more than a century of OE experience$28.20 - $214.63
- DIY Solutions®Ignition Knock (Detonation) Sensor HarnessIgnition Knock (Detonation) Sensor Harness by DIY Solutions®. If you're seeking to get your steel stallion back to its tip-top condition, then this top-notch replacement solution is what you should definitely look out for. When it comes...Designed to help restore your vehicle to its former gloryQuick replacement to let you enjoy an awesome ride again$36.56 - $79.71$37.69 - $86.65Save up to 8%
- Genuine®Ignition SwitchIgnition Switch by Genuine®. If your engine ignition parts are in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain store. On CARiD you'll...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$43.50 - $420.11
- Standard®Ignition SwitchIgnition Switch by Standard®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the same or even...OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price$10.79 - $319.87
- Standard®Intermotor™ Ignition SwitchIntermotor™ Ignition Switch by Standard®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the...OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price$30.73 - $850.63
- ACDelco®Genuine GM Parts™ Diesel Glow Plug ControllerGenuine GM Parts™ Diesel Glow Plug Controller by ACDelco®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$208.64 - $270.68
- Dorman®Diesel Glow Plug ControllerDiesel Glow Plug Controller by Dorman®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the same...Constructed from superior materialsMade to match OE specifications$110.37 - $302.11
- Dorman®Diesel Glow Plug Power StrapDiesel Glow Plug Power Strap by Dorman®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the...Constructed from superior materialsMade to match OE specifications$23.63
While spark plugs, ignition coils and distributors are the recognizable “stars” of the ignition system, there would be no combustion and an engine wouldn’t run without the unseen and less glamorous utility players in the system – the relays, sensors, switches, and control units. These important components execute critical functions like safely conducting high levels of current, supplying essential data to ignition modules and engine control computers, and executing commands based on those inputs for accurate spark delivery. The electronic components in contemporary ignition systems generate higher voltage and more precise ignition timing than their mechanical forebears, which provides a more powerful spark for complete combustion and better performance, greater fuel economy and lower emissions. Modern ignition parts are also more reliable as well, but they too eventually wear out and fail, and when you have need of replacements, you’ll find them right here on our digital shelves.
The ignition switch is connected to battery voltage. When the key is turned or the start button is activated, power is routed to the ignition relay. A relay allows low current and lighter gauge wire to control the high current needed to supply the ignition coil, avoiding the danger and complexity of routing high current carrying, heavy gauge wire to the ignition switch. Inside the relay is a control circuit and a power circuit. When power is sent to the relay, current is applied to the relay coil, creating a magnetic field that closes the power circuit contacts and sends voltage to the ignition coil. If the ignition relay is faulty no power will be supplied to the ignition and the engine won’t start. When a properly functioning relay is energized, the closing of the internal switch contacts can be heard or felt by hand. Voltage and resistance checks with a DVOM (Digital Volt Ohm Meter) can also be performed to determine whether the relay or relay wiring is at fault.
When power is supplied to the ignition coil, the current flowing through the coil’s primary windings creates a magnetic field. When that current flow is interrupted the collapsing magnetic field produces an electric current in the secondary windings, which is stepped up to the 15,000 – 40,000 volts needed to jump the gap between the spark plug electrodes and ignite the air/fuel mixture in the cylinders. On distributor ignitions, current flow is interrupted by a triggering mechanism in the distributor – mechanical breaker points on older distributors and magnetic pickup coils or hall effect switches on electronic ignition distributors. There is a trigger wheel called a reluctor on the distributor shaft and as the shaft rotates and the reluctor passes the pickup coil or hall effect switch, a signal is sent to an ignition module, which contains a transistor that closes and opens the primary circuit to create and collapse the magnetic field and produce the voltage sent to the spark plugs.
Electronic distributor ignition offered several advantages over its mechanical predecessor: there were no breaker points to wear, the transistor in the module could open and close the primary circuit much faster, and higher voltage could be carried, resulting in more voltage to the spark plugs and more efficient engine operation. Nevertheless, although more reliable, electronic components are still subject to failure. If the vehicle won’t start and there is no spark at the ignition coil when checked with a spark tester, turn the ignition on and check for voltage at the positive terminal of the ignition coil. If voltage is present, connect a test light between the negative coil terminal and ground. The test light should flicker when the engine is cranked. If the light doesn’t flicker, the ignition module, pickup coil or hall effect switch, or circuit wiring is faulty. The pickup coil and hall effect switch can be tested with a DVOM. Some electronic systems are affected by the gap between the pickup coil and reluctor, which can be adversely affected by distributor bushing wear and excessive play between the distributor shaft and housing. If the gap dimension is incorrect the engine may misfire or fail to start.
The ignition coils in distributorless ignition systems have their primary circuits switched on and off by an ignition module or engine control computer based on the signal from the Crankshaft Position (CKP) sensor. This signal indicates the position and speed of the crankshaft for the greatest ignition accuracy, eliminating imprecise timing that can be caused by timing chain, distributor drive gear and distributor wear and play. There are 2-wire permanent magnet and 3-wire hall effect sensors and the sensor may be mounted on the timing cover, or at the side or rear of the engine depending on whether the reluctor is mounted on the crankshaft damper, the crankshaft itself or the flywheel/flexplate. If the vehicle won’t start, runs rough, stalls, and has poor acceleration and fuel economy, the CKP sensor may be faulty. A defective CKP sensor may set a fault code and illuminate the CHECK ENGINE light. Both sensor types can be tested with a DVOM, and a scan tool connected to the vehicle’s diagnostic port will reveal fault code(s). Some engines also employ a Camshaft Position (CMP) sensor, which functions in a similar manner, for ignition timing purposes.
On electronic ignition systems primary circuit on/off control is by an ignition module, sometimes called an igniter, and/or the engine control computer. That was the sole task of the modules used with early electronic distributors, where initial timing was manually set using an inductive timing light, and ignition advance was determined by centrifugal and vacuum advance mechanisms. However, on distributorless ignition systems timing is not adjustable, and both initial timing and advance are computer controlled based on internal programming and inputs from sensors indicating engine speed, engine load, throttle position, and engine coolant temperature. A knock sensor is also employed to detect spark knock and signal the computer to retard timing. If an ignition module fails, the engine won’t start; troubleshooting is described above. If there is a problem with an engine control computer or with one of the sensors, actuators, or circuits in the engine control system, the CHECK ENGINE light should illuminate. A scan tool connected to the vehicle’s diagnostic port can be used to find trouble codes.
No matter what vehicle you’re working on or the type of ignition system, we have the replacement relays, sensors, switches and control units needed to restore proper performance, reliability and fuel economy. We offer components that are manufactured to original equipment specifications, so when repairs are completed you can count on the performance your vehicle was designed to deliver. In addition to the components described above, we also offer parts that are often needed to achieve a complete repair including harnesses, connectors, mounting brackets, and more.