The throttle body sensor for a 2008 Chevy Impala typically costs about $20 to $120 for the sensor alone, while the full throttle body assembly can range from roughly $150 to $500 depending on engine variant and whether you buy aftermarket or OEM parts. Labor to install is extra if you’re not doing the replacement yourself.
In the 2008 Impala, the throttle system is electronic (drive-by-wire). The throttle position sensor sits on the throttle body and monitors the throttle opening as commanded by the engine control module. The car offered several engines, including a 3.5-liter V6 and a 3.9-liter V6 (and, in some configurations, a larger V8 in performance models). Replacement part prices can vary by engine design because throttle bodies differ between configurations. When shopping, confirm your VIN and engine to get the correct part number.
What you’re buying and how it’s used
Understanding whether you need just the sensor or the entire throttle body helps explain the price spread. A TPS is a separate sensor attached to the throttle body, while the throttle body assembly includes the motor (for electronic throttle control) and associated sensors. Prices reflect whether you’re purchasing a standalone sensor or a complete throttle body unit.
Typical price ranges
Before listing typical price ranges, note that prices vary by retailer and whether the part is new, remanufactured, or used. The ranges below are common in the current market across major auto parts suppliers.
- Throttle Position Sensor (TPS) alone: about $20 to $120
- Throttle body assembly (with sensor and motor): about $150 to $500
Prices above give you a baseline. OEM (dealer) parts tend to be at the higher end, while aftermarket options usually sit in the lower to mid-range. Always verify the exact part number for your engine variant to avoid compatibility issues.
Where to buy
Before you shop, it helps to know common sources where the part is typically available. The following retailers offer both aftermarket and OEM options, with varying price points and warranties.
- AutoZone — broad TPS and throttle body selection; prices generally align with the ranges above and often include in-store pickup.
- O'Reilly Auto Parts — similar to AutoZone, with occasional promotions on remanufactured components.
- RockAuto — wide range of brands and price points, good for comparing aftermarket vs. OEM equivalents by part number.
- GM Parts Online / dealership parts counters — authentic GM OEM parts, typically at the higher end but guaranteed compatibility.
- Amazon / eBay — prices vary widely; check seller ratings and part compatibility with your VIN.
Conclusion: When buying, always check the exact part number, compatibility with your VIN, and whether the seller offers a warranty or return policy in case the part doesn’t fit your vehicle.
Labor and installation considerations
Installation costs vary by region and shop, but for a TPS replacement you’re typically looking at a shorter service time than a full throttle body replacement. Expect roughly 0.5 to 1 hour of labor for a TPS swap and about 1 to 2 hours if you’re replacing the entire throttle body in a drive-by-wire system. Labor rates commonly range from about $70 to $150 per hour. Always factor in potential additional costs if the throttle body is the part that’s ultimately replaced or if mounting hardware is damaged.
Summary
For a 2008 Chevy Impala, the sensor alone is usually $20–$120, while a full throttle body assembly runs about $150–$500. Prices vary by engine variant (3.5L/3.9L V6, and any applicable V8 configurations), retailer, and whether parts are OEM or aftermarket. Plan for additional labor costs if installation is not a DIY project, and verify exact part numbers against your VIN before purchasing. Shopping across major retailers and confirming compatibility helps ensure you get the right part the first time.
How much is a throttle body for a 2008 Chevy Impala?
In most cases, the cost to replace a throttle body is between $500 and $650. Some throttle bodies may be cheaper to replace, costing under $200. Others are more expensive, costing up to $1,000 or more. Ultimately, the price depends on your vehicle.
How to reset throttle position sensor Chevy Impala?
Method 2: Reset TPS Without a Scanner (Manual Method)
- Turn the ignition off.
- Reconnect the battery terminal securely.
- Without starting the engine, turn the ignition key to the "ON" position (all dashboard lights on).
- Slowly press the accelerator pedal to the floor, hold it for 10 seconds, then release.
Can I replace a throttle position sensor myself?
Installing a New Throttle Position Sensor
Start by installing the sensor using the mounting screws. Next, connect your sensor to your vehicle'selectrical system using a convenient electrical connector. You should be able to easily push it together and hear a distinct click. Check to ensure a firm connection.
What happens when your throttle body sensor goes bad?
Rough Idle
The engine may idle too high, too low, or fluctuate unpredictably. In more severe cases, a bad throttle body can cause stalling—especially when coming to a stop or when the engine is cold.