A Guide to Replacing the Oxygen Sensors on Your 2011-2017 Buick Regal
Fix that check engine light and restore fuel economy by understanding how to choose the right oxygen sensor for your Regal.
- Confirm if you need an upstream or downstream sensor before buying; they are not interchangeable.
- Stick with OEM-quality brands like ACDelco, Denso, Bosch, or NGK/NTK for the best reliability.
- A check engine light for an O2 sensor can also be caused by an exhaust or intake leak; consider a smoke test before replacing parts.
- Using a special O2 sensor socket and penetrating oil will make the replacement job much easier.
Is Your Buick Regal's Oxygen Sensor Failing?
When an oxygen sensor starts to go bad, your car will usually tell you. The most obvious sign is the check engine light turning on. You might also notice your gas mileage getting worse, a rough or shaky idle, or the engine feeling sluggish and slow to respond. In some cases, you may smell a harsh odor like rotten eggs from the exhaust. Ignoring these signs can eventually damage your expensive catalytic converter, so it's a good idea to address the problem quickly.
🎬 Watch: 6 common symptoms of a failing oxygen sensorCheck for Leaks Before Replacing Parts
General Motors has issued a Technical Service Bulletin (TSB 20-NA-065) for many vehicles, including the 2011-2017 Regal. It notes that O2 sensor and fuel trim error codes are often caused by small air leaks in the engine's air intake or the exhaust system. Before you spend money on a new sensor, it's wise to have a mechanic perform a "smoke test" to check for leaks. Fixing a cracked hose or a bad gasket could solve your problem without needing a new sensor.
🎬 See why you should check for leaks before replacing sensorsChoosing the Right Aftermarket Oxygen Sensor
You don't need to buy the most expensive sensor, but choosing a quality part is important for it to work correctly and last. Aftermarket sensors are often more affordable than OEM parts and can offer the same quality. Here’s a breakdown of the brands available for your Regal.
Premium Brands (OEM-Quality)
These brands are known for making original equipment parts for car manufacturers, including GM. They are your most reliable choices.
- ACDelco: This is GM's own parts brand and is the original equipment for your Regal. You can't go wrong with an ACDelco sensor, as it's guaranteed to fit and work just like the original.
- Denso, NGK (NTK), and Bosch: These are top-tier manufacturers that supply parts to carmakers worldwide. In fact, some ACDelco sensors are made by Denso or NGK. Bosch invented the modern oxygen sensor and is a trusted name in the industry. Any of these brands are excellent alternatives to ACDelco.
Mid-Grade & Value Brands
These brands offer a balance between price and quality, but quality can sometimes be inconsistent.
- Delphi: Historically an OEM supplier for GM, Delphi is now an independent company. While they have a good reputation, some mechanics question if their quality is the same as it used to be.
- Walker Products: Walker is a well-known aftermarket exhaust parts company. While some forum users have had bad experiences, others report that their sensors use quality components and work well. They are a decent budget-friendly option.
Economy Brands
These are your cheapest options, but the quality and lifespan can be a gamble.
- DriveWire, Spectra: These brands offer significant savings. However, they may not last as long or provide the same level of accuracy as premium brands. If your budget is very tight, they can get the job done, but be aware you might be replacing them again sooner.
Direct-Fit vs. Universal Sensors
Always choose a "direct-fit" sensor. These come with the correct wire length and electrical connector for your Regal, making installation a simple plug-and-play process. "Universal" sensors require you to cut your old connector off and splice it onto the new sensor's wires. This can lead to connection problems and is not recommended.
Typical Replacement Costs for a 2011-2017 Buick Regal
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Sensor | $38 - $195 |
| New OEM (ACDelco) Sensor | $60 - $200+ |
| Shop Labor | $75 - $150 per sensor |
Frequently Asked Questions
How many oxygen sensors does my 2011-2017 Regal have?
Most 2.0L and 2.4L four-cylinder Regals of this generation have two oxygen sensors: one upstream (before the catalytic converter) and one downstream (after the catalytic converter). They are both located on the single exhaust pipe.
What's the difference between an upstream and downstream sensor?
The upstream sensor (Sensor 1) measures the raw exhaust coming from the engine to control the air-fuel mixture. The downstream sensor (Sensor 2) measures the exhaust after it has passed through the catalytic converter to make sure the converter is cleaning the exhaust properly. They are not interchangeable, even if they look similar, because they may have different wire lengths or internal calibrations.
Can I replace just one sensor?
Yes. Your car's computer will generate a specific code that tells you which sensor has failed (e.g., Bank 1 Sensor 1 for upstream or Bank 1 Sensor 2 for downstream). You only need to replace the one that is faulty. However, since sensors have a similar lifespan, some owners choose to replace them in pairs if the car has high mileage.
What tools do I need for the job?
You will need a special oxygen sensor socket, which is a deep socket with a slot cut out for the wire. You will also need a ratchet and possibly an extension. Spraying the old sensor with penetrating oil and letting it soak can make removal much easier, as they are often rusted in place. Many new sensors come with anti-seize compound on the threads, but if not, you should apply some before installation.
🎬 Watch this step-by-step guide on how to replace the sensorIs there a recall on the oxygen sensor for my Regal?
No, there are no specific recalls for the oxygen sensors on the 2011-2017 Buick Regal. However, a persistent check engine light with an O2 sensor code could be related to a wiring issue or an exhaust/intake leak as noted in a GM service bulletin.
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Technical Specifications
OEM Part Numbers: 12622308 12592591 12592592 213-4299 213-4772
Most 2011-2017 Regals use a 4-wire, heated, narrow-band oxygen sensor. Always verify the part number and position (upstream or downstream) for your specific engine (2.0L Turbo or 2.4L).
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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:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Buick Regal's Oxygen Sensor Failing?
- Check for Leaks Before Replacing Parts
- Choosing the Right Aftermarket Oxygen Sensor
- Premium Brands (OEM-Quality)
- Mid-Grade & Value Brands
- Economy Brands
- Direct-Fit vs. Universal Sensors
- Typical Replacement Costs for a 2011-2017 Buick Regal
- Frequently Asked Questions
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