A Guide to the Throttle Position Sensor for the 1998-2004 Buick Regal
Understanding common failures and choosing the right replacement throttle position sensor for your 3800 V6 engine.
- A failing TPS will cause noticeable issues like poor acceleration, erratic idle, and bad transmission shifting.
- This is a common DIY repair that requires basic tools and can be completed in under an hour.
- No recalls were issued for the TPS on the 1998-2004 Regal, so repair is a customer responsibility.
- Choose a quality aftermarket brand like ACDelco, Delphi, or Standard Ignition for better reliability.
Symptoms of a Failing Throttle Position Sensor
When the TPS in your 1998-2004 Buick Regal starts to fail, it sends incorrect information to the engine computer. This can cause a variety of noticeable driving problems. You will almost certainly see a Check Engine Light on your dashboard.
Common symptoms include:
🎬 Watch: 9 common symptoms of a failing throttle position sensor.- Hesitation or Lack of Power: The car may stumble or feel sluggish when you accelerate.
- Erratic Idle: The engine might idle too high, too low, or the RPMs may surge up and down on their own.
- Poor Shifting: Your automatic transmission may shift harshly, delay shifts, or shift at the wrong times.
- Sudden Surging or Stalling: The car could unexpectedly lurch forward or the engine may stall completely, especially when coming to a stop.
- Reduced Engine Power: In some cases, a severe TPS failure can force the car into a 'limp mode' with drastically reduced power.
Is it Safe to Drive?
You can likely drive a short distance, but it is not recommended. A failing TPS can cause unpredictable behavior like sudden stalling or surging, which is a safety risk, especially in traffic. It's best to get the vehicle serviced as soon as possible.
🎬 See how to test your TPS before buying a replacement.Choosing the Right Aftermarket TPS
For the 1998-2004 Buick Regal, you have several aftermarket TPS options. Since this is a critical sensor, choosing a quality part is important to avoid replacing it again soon.
OEM vs. Aftermarket: The original part was made by ACDelco. While ACDelco is still available and often considered the top choice, some forum users have reported failures with newer ACDelco parts, suggesting they may not be the same quality as the originals or are sometimes repackaged from other manufacturers. Aftermarket brands like Standard Motor Products, Walker Products, and Delphi are common alternatives. Delphi, in particular, is often praised by mechanics as a high-quality option.
Pro Tip: The TPS is considered a wear item. While it's tempting to buy the cheapest option, spending a little more on a reputable brand like ACDelco, Delphi, or Standard Ignition can save you the headache of a premature failure.
Brand Tiers
- Premium Tier (Highest Quality & Price): ACDelco, Delphi. These brands are often original equipment suppliers and are expected to offer the best fit and longevity.
- Mid-Grade Tier (Good Balance of Price & Quality): Standard Ignition, Walker Products. These are established aftermarket brands that produce reliable parts that meet or exceed OE specifications.
- Economy Tier (Lowest Price): Replacement, Global Parts, True Tech. These brands offer a budget-friendly solution, but their long-term durability may be less consistent than premium brands.
Cost to Replace a Buick Regal TPS
Replacing the throttle position sensor is a relatively inexpensive repair. The part itself is affordable, and the labor is straightforward.
| Item | Estimated Cost |
|---|---|
| New Aftermarket TPS Part | $35 - $98 |
| Shop Labor | $85 - $120 |
| Estimated Total (Professional) | $120 - $218 |
| DIY Cost (Part Only) | $35 - $98 |
*Cost estimates are based on market averages and may vary by location and shop.
Frequently Asked Questions
Where is the TPS located on a 1998-2004 Buick Regal?
The throttle position sensor is located on the side of the throttle body, which is where the large air intake tube connects to the engine. On the 3800 V6 engine, it is a small, black plastic sensor held on by two screws, typically found just below the idle air control (IAC) valve.
Can I replace the TPS myself?
Yes, this is a good DIY job for a beginner. The process involves disconnecting the battery, unplugging the electrical connector, and removing two screws. The screw on the back side can be difficult to reach, but it is possible to do without removing the entire throttle body. 🎬 Watch this 3800 V6 throttle position sensor replacement walkthrough. You will likely need a Torx or Phillips screwdriver.
Does the new TPS need to be calibrated?
While some vehicles require a complex calibration with a scan tool, many GM vehicles of this era can have their TPS reset with a simple procedure. After installing the new sensor and reconnecting the battery, you can often perform a 'relearn' by turning the ignition to the 'ON' position (without starting the engine) for a few minutes, then turning it off before starting the car. It is also a good idea to clean any carbon buildup from the throttle body while you have access.
Were there any recalls for the Buick Regal TPS?
No. While General Motors has issued special coverage programs and TSBs for throttle sensor issues on other vehicles and newer model years, there are no specific recalls or bulletins that apply to the throttle position sensor on the 1998-2004 Buick Regal.
Helpful Videos
Technical Specifications
OEM Part Numbers: 17113578 17106680 17113625
3-pin variable resistor sensor mounted to the throttle body.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Buick Regal: