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On average, the cost for a Mercedes-Benz S420 Transmission Position Sensor (Switch) Replacement is $284 with $189 for parts and $95 for labor. Prices may vary depending on your location.
| Car | Service | Estimate | Shop/Dealer Price |
|---|---|---|---|
| 1996 Mercedes-Benz S420V8-4.2L | Service typeTransmission Position Sensor (Switch) Replacement | Estimate$504.35 | Shop/Dealer Price$619.19 - $924.34 |
| 1999 Mercedes-Benz S420V8-4.2L | Service typeTransmission Position Sensor (Switch) Replacement | Estimate$484.35 | Shop/Dealer Price$599.22 - $904.39 |
| 1997 Mercedes-Benz S420V8-4.2L | Service typeTransmission Position Sensor (Switch) Replacement | Estimate$484.35 | Shop/Dealer Price$599.22 - $904.39 |
| 1994 Mercedes-Benz S420V8-4.2L | Service typeTransmission Position Sensor (Switch) Replacement | Estimate$472.55 | Shop/Dealer Price$584.43 - $880.72 |
| 1995 Mercedes-Benz S420V8-4.2L | Service typeTransmission Position Sensor (Switch) Replacement | Estimate$472.55 | Shop/Dealer Price$584.50 - $880.84 |
| 1998 Mercedes-Benz S420V8-4.2L | Service typeTransmission Position Sensor (Switch) Replacement | Estimate$484.35 | Shop/Dealer Price$599.22 - $904.39 |
Vehicles equipped with an automatic transmission are designed to start only in park or neutral gears. If a vehicle is able to start in reverse or drive gears, it can unintentionally move, causing damage to property or injuries to occupants or bystanders. For this reason, automakers have developed a safety shutdown called a transmission position sensor or range sensor that cuts the power to the starter control circuit if the vehicle is not in park or neutral. This sensor or switch is typically mounted on the side of the transmission and screws into the body of the transmission to detect in which gear the transmission is engaged. If the driver attempts to start the vehicle when the transmission is engaged in a gear other than park or neutral, power is not distributed to the starter circuit. The vehicle will not crank, preventing unintentional vehicle movement. If the transmission position sensor, or range sensor fails, the vehicle may be able to start while engaged in a drive gear.
While the transmission position sensor is does not require any routine service, as an electronic part, it can fail. If your automatic transmission-equipped vehicle is able to start in a gear other than park or neutral, or if your vehicle will not start when in park or neutral, you may need to replace the transmission position sensor.
If your vehicle is able to start in gear, there is potential to cause injury to people or damage to property. If the range sensor fails, have it replaced immediately.
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