This little guy basically tells your engine computer how far you’re pressing the gas pedal. It measures the angle of the throttle plate, which is how much air is getting into the engine. It sends that information as an electrical signal – voltage, specifically – and the computer uses that to figure out how much fuel to inject and when to advance the timing. It’s a pretty simple concept, but vital. Think of it as a messenger. You move your foot, the throttle plate opens, and this sensor reports that movement to the engine’s brain. Without accurate information from it, the engine doesn’t know what you want it to do. It impacts everything from acceleration and fuel economy to idle speed and even emissions. It works closely with the engine control unit, and other sensors, to maintain proper engine operation. Well, a failing throttle position sensor can cause a whole lot of drivability problems. You might get a rough idle, hesitation when you step on the gas, or even stalling. Sometimes it’ll throw a check engine light. You’ll notice if it's bad – the engine won't respond smoothly to your foot. It doesn’t always cause a catastrophic failure, but it’s one of those things that steadily makes the car harder and harder to drive. They’re pretty reliable, but they do wear out over time. You can find replacements pretty easily, and sites like Fixparts Online have a good selection. It’s generally not a super difficult repair, but you do need to be a bit careful when disconnecting and reconnecting electrical connectors. Top-rated performance: Throttle Position Sensor (MPN 12321244409) has a 12-month warranty!

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