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Common signs include lacking power when accelerating, rough or slow idle, stalling, inability to shift up, and the Check Engine Light coming on. Our certified technicians can come to you and diagnose the problem. You will receive a $30 credit towards any follow-up repairs that result from the diagnostic. Following are example prices for Throttle Position Sensor (TPS) Replacement. Click on the button below to get an upfront quote for your car.
|Cars||Estimate||Parts Cost||Labor Cost||Savings||Average Dealer Price|
|2007 Volvo V70||$550||$479.82||$70.00||6%||$587.32|
|2010 Chevrolet Cobalt||$301||$231.38||$70.00||11%||$338.88|
|2006 Toyota Avalon||$432||$305.58||$126.00||13%||$499.08|
|2007 Land Rover Range Rover Sport||$419||$320.94||$98.00||11%||$471.44|
|2006 Mercedes-Benz G500||$391||$320.94||$70.00||8%||$428.44|
|2011 Porsche 911||$391||$320.94||$70.00||8%||$428.44|
The throttle position sensor (TPS) is part of your vehicle's fuel management system, and helps ensure that the correct mixture of air and fuel is delivered to your engine. The TPS provides the most direct signal to the fuel injection system of what power demands are being made by the engine. The TPS signal is continually measured and combined many times per second with other data such as air temperature, engine RPM, air mass flow, and how quickly the throttle position changes. These data determine precisely how much fuel to inject into the engine at any given moment. If the throttle position sensor and its other sensor partners do their job correctly, your car accelerates, cruises, or coasts smoothly and efficiently, as you expect, while maintaining optimal fuel economy.
The throttle position sensor can fail in several ways, all of which result in poor fuel economy at best, and performance limitations that may create safety hazard for you and other motorists at worst. This sensor can fail gradually, or all at once. In most cases, the Check Engine Light is illuminated if a TPS failure is detected. Also, most manufacturers provide a “limp home” mode of operation with reduced power if a failure is detected. This is intended to at least allow a driver to get off a busy highway in a safer manner.
Once the TPS begins to fail, even partially, you’ll need to replace it right away. Replacing the TPS will include clearing relevant fault codes, and may require software re-programming of the new TPS module to match other engine management software. This is all best left to a professional mechanic who can provide you with a diagnosis, and then install the correct replacement part.
Here are some common symptoms of a bad or failing throttle position sensor to watch for:
It may feel as though the car simply doesn't accelerate as it should. It may accelerate smoothly, but lack power. On the flip side, it may be that your car suddenly speeds up while you’re driving, even if you haven’t pressed the accelerator. If these symptoms occur, there's a good chance you've got a problem with the TPS.
This is another failure mode of the TPS, which indicates that it is falsely limiting the power being requested with your accelerator pedal foot. You may find that your car will accelerate, but not beyond a speed of 20 - 30 MPH. This symptom often goes hand in hand with loss-of-power behavior.
The Check Engine Light may come on if you’re having issues with your TPS. This isn’t always the case though, so don’t wait for the Check Engine Light to illuminate before you get it checked out. If you have any of the above symptoms, have your vehicle checked for trouble codes to verify the source of the problem.
The throttle position sensor is key to getting the desired power and fuel efficiency from your vehicle in any driving situation. As the symptoms listed above make clear, failure of this component has serious safety implications, and must be checked out immediately by a qualified mechanic.