GM 40009349 Sensor
( Brand: Gm ), ( Manufacturer Part Number: 40009349 ), ( Part Type: Sensor ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Universal Fitment: Direct Replacement ), ( Parts Included: Only Part Reference 3 On The Diagram Is Included )
Review GM Genuine Temp Sensor
The **GM 40009349 Sensor** is a high-performance, precision-engineered automotive sensor designed to deliver reliable and accurate data for modern vehicle diagnostics and control systems. Part of General Motors advanced sensor lineup, this component is specifically engineered to function within the vehicle s powertrain, providing critical feedback to the engine control module (ECM) or powertrain control module (PCM). Built with robust construction, the GM 40009349 Sensor incorporates a durable housing and high-quality internal components to ensure long-term durability and resistance to environmental factors such as moisture, dust, and temperature fluctuations, which are common in automotive applications. This sensor operates on a principle of electromagnetic induction or piezoelectric response, depending on its specific function whether it be monitoring crankshaft position, camshaft position, or another critical rotational parameter delivering precise pulse signals that the vehicle s computer system interprets to optimize engine performance, fuel efficiency, and emissions compliance.
The sensor itself features a compact yet sturdy design, often featuring a threaded or flange-mounted interface for secure installation within the engine bay or transmission housing. Its internal circuitry is meticulously calibrated to provide consistent and repeatable readings, minimizing signal noise and ensuring seamless integration with the vehicle s onboard diagnostics (OBD) system. Whether used in gasoline, diesel, or hybrid powertrains, the GM 40009349 Sensor adheres to strict manufacturing standards to guarantee compatibility with a wide range of GM vehicles, from mid-size sedans to performance-oriented trucks. Its design also incorporates fail-safe mechanisms, such as self-diagnostic capabilities, which alert the driver or technician to potential malfunctions through check engine lights or fault codes, thereby enhancing overall vehicle reliability and reducing the risk of unexpected breakdowns.
Beyond its functional excellence, the GM 40009349 Sensor is engineered with cost-efficiency in mind, offering a balance between performance and affordability for both original equipment manufacturers (OEMs) and aftermarket replacements. Its modular design allows for easy installation and replacement, making it a preferred choice for automotive technicians during routine maintenance or diagnostic procedures. Whether integrated into a modern GM vehicle equipped with advanced driver-assistance systems (ADAS) or serving as a foundational component in a traditional internal combustion engine, this sensor exemplifies GM s commitment to innovation and engineering precision. By ensuring accurate sensor data, it plays a pivotal role in maintaining the vehicle s operational integrity, contributing to smoother rides, improved fuel economy, and reduced environmental impact.
**Pros and Cons of buying a GM 40009349 Sensor (Oxygen Sensor, Bank 1 Sensor 1)**
The GM 40009349 is an oxygen (O2) sensor, commonly used in General Motors vehicles for monitoring exhaust gases to optimize engine performance and emissions. Below is a detailed breakdown of its advantages and disadvantages.
### **Pros**
1. **Compatibility with GM Vehicles**
The sensor is designed specifically for certain GM models, ensuring a direct fit without modifications. It is commonly used in vehicles like the Chevrolet Silverado, GMC Sierra, and other GM trucks and SUVs equipped with the 5.3L, 6.0L, or 6.2L V8 engines. This reduces the risk of installation issues.
2. **OEM Quality**
As an original equipment manufacturer (OEM) part, it meets GM s strict manufacturing standards, which typically means better durability and reliability compared to aftermarket alternatives. OEM sensors are less likely to fail prematurely due to inferior materials.
3. **Accurate Emissions Monitoring**
Oxygen sensors play a critical role in maintaining accurate air-fuel ratios. A functioning sensor ensures the engine runs efficiently, reduces fuel consumption, and helps the vehicle pass emissions tests. Replacing a faulty sensor can restore optimal performance.
4. **Prevents Catalytic Converter Damage**
A failing oxygen sensor can send incorrect signals to the engine control unit (ECU), leading to rich or lean fuel mixtures. Over time, this can damage the catalytic converter, which is far more expensive to replace. Replacing the sensor proactively can avoid this costly repair.
5. **Warranty Coverage**
If purchased from an authorized GM dealer or a reputable supplier, the sensor may come with a warranty, providing peace of mind against early failure. Aftermarket sensors often lack such warranties.
6. **Easy Installation**
The sensor is a straightforward replacement part. Most mechanics or even experienced DIYers can install it without specialized tools, though proper heat shielding and torque specifications must be followed to avoid damage.
7. **Long-Term Cost Savings**
While the upfront cost is higher than some aftermarket options, the longevity and reliability of an OEM sensor can save money in the long run by avoiding repeated replacements or related engine issues.
---
### **Cons**
1. **Higher Upfront Cost**
The GM 40009349 is more expensive than many aftermarket oxygen sensors. Prices can range from $100 to $200 or more, depending on the supplier. This can be a significant outlay for budget-conscious buyers.
2. **Limited Availability Outside GM Dealers**
While the sensor is widely available, it may not be stocked at all auto parts stores. Buyers often need to order it online from GM dealers, specialty suppliers, or reputable online retailers, which can add shipping time and potential extra costs.
3. **Potential for Counterfeit Parts**
Purchasing from unauthorized sellers increases the risk of receiving a counterfeit or low-quality sensor. Counterfeit parts may fail quickly, leading to repeated replacements and frustration. Always buy from trusted sources with return policies.
4. **Mixed Reviews on Longevity**
Some users report that even OEM sensors fail prematurely, especially in high-mileage vehicles or under extreme driving conditions (e.g., frequent towing, off-roading, or extreme temperatures). This variability can be frustrating for buyers expecting long-term reliability.
5. **Requires Professional Installation for Some Vehicles**
While many sensors are easy to replace, some GM vehicles may require additional steps, such as removing the exhaust pipe or catalytic converter to access the sensor. In these cases, professional installation may be necessary, adding labor costs.
6. **May Not Fit Non-GM Vehicles**
The GM 40009349 is specific to GM applications. Attempting to use it in a non-GM vehicle could result in compatibility issues, such as incorrect thread size or electrical connector mismatches. Always verify compatibility before purchasing.
7. **Environmental and Heat Sensitivity**
Oxygen sensors are exposed to high temperatures and exhaust fumes, which can degrade them over time. Even OEM sensors may wear out faster in vehicles with poor exhaust flow or those frequently driven in harsh conditions.
---
### **Conclusion**
The GM 40009349 oxygen sensor is a reliable and high-quality replacement part for GM vehicles, offering accuracy, durability, and compatibility with the manufacturer s specifications. Its OEM status ensures better performance and longevity compared to many aftermarket alternatives, making it a sound choice for those prioritizing quality and long-term reliability.
However, the higher cost and potential for counterfeit parts are significant drawbacks. Buyers should weigh the upfront expense against the potential savings from avoiding engine or emissions-related issues. Additionally, ensuring the sensor is purchased from a trusted source and installed correctly is crucial to maximizing its lifespan.
For most GM vehicle owners experiencing oxygen sensor failure, the GM 40009349 is the best choice if budget allows. Those looking for a more economical option may consider high-quality aftermarket sensors from reputable brands, but they should research thoroughly to avoid poor performance or early failure.
---
### **Recommendation**
If you are maintaining or restoring a GM vehicle and need an oxygen sensor for Bank 1 Sensor 1, **purchase the GM 40009349 from an authorized GM dealer or a well-reviewed online retailer with a return policy**. Verify the sensor s compatibility with your specific vehicle model and year to avoid issues.
For DIYers comfortable with basic mechanical work, the sensor is relatively easy to replace, but follow the manufacturer s torque specifications and ensure proper heat shielding to prevent damage. If unsure about installation, consult a professional mechanic.
If cost is a major concern, research high-quality aftermarket alternatives (e.g., Bosch, Denso, or Motorcraft) and read reviews to ensure they meet GM s performance standards. However, for the best balance of reliability and longevity, the GM OEM sensor is the recommended choice.
Details:
3.0L diesel 2025 sensors. Electrical parts are not returnable. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer. Position 1 turbocharger.
Parts must be resalable and in the original packaging.
part #: 40009349 prices
- $82.53-$92.44
specifications emissyste:
- brand: Gm
- mpn: 40009349
- part type: Sensor
- genuine oem: Yes
- manufacturer warranty: 1 Year
- universal fitment: Direct Replacement
- parts included: Only Part Reference 3 On The Diagram Is Included
returns emissyste:
- time: 30 Days
- paid by: Seller
- policy: Returns Accepted
payments emissyste:
- other
- wallet: Google-pay
- credit card: Visa
offer emissyste:
- quantity: 1
- options: Ship-to-home
- availability: In Stock
- started: March 27, 2026
- sold: 0
shipping emissyste:
- transit: 3-6 Days
- type: Fixed
- cost: $8.00
- service: Standard
- class: Standard
general emissyste:
- condition: New
- Car Truck Parts Accessories > Exhaust Emission Systems > Other Exhaust Emission Parts
seller emissyste:
- city: Highland, Michigan
- rating: 99.2%
- # reviews: 1471
Gm 40009349 Is Similar To:
- 10449092 Gm Buick Pontiac Genuine (34.4% similar) Free shipping. Item is brand new...(November 24th, 2017)
- 12559015 Acdelco Gm Original Equipment Genuine Vapor Control Valve (30.9% similar) This will depend on the carrier. Software, DVD's, videos and VCR tapes are non-returnable, unless defective. Most carriers take 3-4 weeks to settle a claim...(October 7th, 2018)
- 12570427 Acdelco Gm Original Equipment New Genuine Engine Lh Valve Cover (29.1% similar) 5, classic 3500 crew cab, extended regular cab 1 ton, 2/6 '6 box 3/4 8' 5'8 chassis ton 161. 3L, 8 Cl 3L4 DOORCADILLACCTS2004 Cl 2L1 2 ton, 1500 crew cab, cab long box, standard extended regular 2500 3/4 3500 chassis, 185. 5, 3500 crew cab, extended regular 4 door 1/2 ton, classic 1500 cab long box...(August 2nd, 2018)
- 12573167 Ac Delco New Gm Pre And Post Cat Oxygen Sensor (30.2% similar) LS2 engines. Vehicle fitment: 2005 Buick Rainier Chevrolet SSE trailblazer with no return or exchange on MI's-ordered parts. You cannot rely on fitment chart to be accurate. Item: new oem Gm ac Delco pre and post catalytic converter oxygen sensor for 2005 Buick Rainier, Chevrolet SSE, ...(October 2nd, 2018)
- 12577221 Gm Brand New Genuine Oem Evaporative Emissions System Lines (34.3% similar) Manufacturer part number: identified in schematic if applicable...(December 24th, 2018)
- 12578576 Gm Chevrolet Cobalt Pontiac Saurn Ion Oxygen Sensor (28.6% similar) Get business information that counts. This came off a 08 Lt...(June 1st, 2018)
- 12580827 Gm Cobalt Pontiac Pursuit Oxygen Sensor Oem Ac Delco (34.8% similar) Get business information that counts. 2 oxygen sensor oem ac Delco images to. This came off a 08 Chevrolet cobalt ls...(November 14th, 2018)
- 12609457 Gm Heated Oxygen Sensor (41.3% similar) Items must be resalable. Items must be able to ship in the same container. Today we operate ten of the most popular new car franchises. Item condition unless stated all of our are brand new with a box...(January 23rd, 2018)
- 12611127 Gm Chevrolet Cobalt Pontiac Saurn Ion Oxygen Sensor (28.6% similar) Get business information that counts. 05-10 Chevrolet cobalt Pontiac g5 Saturn ion oxygen sensor images to. This came off a 08 Lt...(June 1st, 2018)
- 12637297 Acdelco Gm Original Equipment Brand New Genuine Oem Oxygen Sensor (40% similar) Please see photos for more detail. I do make mistakes like everyone does. The next item up for your consideration is a ac Delco o2 oxygen sensor downstream new Chevy express van savanna. I try my best to describe items accurately...(November 12th, 2018)
- 12658354 Gm Chevrolet Gmc Genuine Tube Emis Cnstr Purge (41.9% similar) Parts must be resalable and in the original packaging. Silverado, sierra. Electrical parts are not returnable. Your use and browsing of this parts catalog is at own risk...(June 4th, 2018)
