DORMAN 71MA380 Downstream Nitrogen Oxide Nox Sensor

( Brand: Dorman ), ( Manufacturer Part Number: 71MA380 ), ( Part Type: Sensor ), ( Manufacturer Warranty: 1 Year ), ( Placement On Vehicle: Downstream ), ( Cs-sku: 328 )

Review DORMAN Downstream Nitrogen Oxide Nox Sensor Gmc Hd fits SIERRA 2500 2011–2014

The **Dorman 71MA380 Downstream Nitrogen Oxide (NOx) Sensor** is a high-performance, factory-replacement part designed specifically for the **2011 2014 GMC Sierra 2500 HD** diesel models equipped with emissions control systems, including the **Duramax 6.6L turbocharged V8 engine**. This sensor plays a critical role in monitoring exhaust emissions by detecting nitrogen oxide (NOx) levels, ensuring compliance with stringent EPA and California Air Resources Board (CARB) regulations. Engineered with precision, the **71MA380** features a robust, corrosion-resistant construction to withstand the harsh conditions of diesel exhaust systems, where temperatures can exceed 1,000 F and exposure to soot, oil, and moisture is common. Its advanced **zirconia-based sensing element** provides accurate and reliable readings, allowing the engine s **Diesel Exhaust Fluid (DEF)-injected Selective Catalytic Reduction (SCR) system** to function optimally by regulating NOx emissions before they exit the tailpipe. This sensor is a direct-fit replacement, ensuring seamless integration with the vehicle s wiring harness and mounting bracket, eliminating the need for additional modifications. Whether replacing a failed sensor due to age, contamination, or electrical issues, the **Dorman 71MA380** delivers dependable performance, helping maintain peak engine efficiency, fuel economy, and emissions compliance while extending the lifespan of downstream catalytic converters and SCR components. Built to meet or exceed OEM standards, this sensor is a trusted choice for professional mechanics and do-it-yourselfers alike, offering a cost-effective solution for restoring proper NOx monitoring in your GMC Sierra 2500.

**Pros and Cons of Buying a Dorman 71MA380 Downstream NOx Sensor for a 2011-2014 GMC Sierra 2500**

### **Pros**

1. **Compatibility** The Dorman 71MA380 is specifically designed for diesel engines with NOx sensor requirements, including the 2011-2014 GMC Sierra 2500 HD with a Duramax 6.6L turbo-diesel. This ensures proper fitment and functionality without needing modifications.

2. **Quality and Reliability** Dorman is a well-known brand under the Carter brand, which is trusted for aftermarket automotive parts. Their NOx sensors are built to meet OEM specifications, reducing the risk of premature failure or poor performance.

3. **OEM-Level Performance** The sensor is designed to meet emissions regulations, meaning it will work effectively with the vehicle s diesel particulate filter (DPF) and selective catalytic reduction (SCR) system, helping maintain proper engine diagnostics and emissions compliance.

4. **Ease of Installation** The sensor is a direct replacement, meaning it should install similarly to the original, reducing labor complexity. Most users report straightforward installation with basic tools.

5. **Cost-Effective Alternative** While not the cheapest option, it is often more affordable than an OEM replacement, providing a balance between quality and price.

6. **Warranty Coverage** Dorman typically offers a warranty (usually 12-24 months), providing some assurance against defects or early failure.

7. **Wide Availability** The part is readily available through most auto parts retailers, both online and in-store, ensuring quick replacement if needed.

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### **Cons**

1. **Potential Counterfeit Concerns** Some aftermarket parts, including NOx sensors, may be counterfeit or low-quality knockoffs, especially if purchased from untrusted sellers. Always verify the seller s reputation and product authenticity.

2. **Compatibility with Aftermarket Mods** If the vehicle has been modified (e.g., deleted SCR system, tuner installed, or non-OEM exhaust), the NOx sensor may not function as intended or could trigger check engine lights unnecessarily.

3. **Limited Longevity Compared to OEM** While durable, some users report that aftermarket NOx sensors may not last as long as OEM units, particularly in high-mileage or heavy-duty applications.

4. **Diagnostic Challenges** If the sensor fails intermittently, it may cause false error codes (e.g., P0420, P0430, or P2097), requiring troubleshooting to confirm the issue is with the sensor rather than wiring, connectors, or other components.

5. **Price Sensitivity** For some buyers, the cost may be higher than budget-friendly alternatives, though the trade-off is reliability and compatibility.

6. **Installation Risks** Improper installation (e.g., loose connections, incorrect grounding, or improper sealing) can lead to sensor failure or electrical issues. Ensuring proper installation is critical.

7. **Environmental and Emissions Impact** If the sensor fails, it could lead to improper emissions readings, potentially causing the vehicle to fail emissions tests or trigger unnecessary maintenance alerts.

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### **Conclusion and Recommendation**

The **Dorman 71MA380 downstream NOx sensor** is a solid choice for a 2011-2014 GMC Sierra 2500 HD with a Duramax engine, offering a reliable, OEM-compatible replacement that balances cost and performance. Its primary advantages lie in its compatibility, quality, and ease of installation, making it a practical solution for most owners facing sensor failure.

However, buyers should be cautious about purchasing from unverified sellers to avoid counterfeit parts. Additionally, if the vehicle has aftermarket modifications, users should research whether the sensor will integrate properly or if additional adjustments (such as a tuner or SCR system) are needed.

If you need a **direct replacement NOx sensor** for your 2011-2014 GMC Sierra 2500 and have verified the part s authenticity, the **Dorman 71MA380 is a strong, cost-effective option**. For best results:

- Purchase from a reputable retailer (e.g., RockAuto, Amazon with verified sellers, or local auto parts stores).

- Ensure proper installation by following manufacturer guidelines or consulting a professional if unsure.

- Monitor for any error codes post-installation to confirm the sensor is functioning correctly.

If budget is a concern, compare it with other high-quality alternatives (e.g., **Mopar, Delphi, or Bosch NOx sensors**) to ensure you re getting the best value. For heavily modified vehicles, consider whether a tuner or SCR system adjustment is necessary to avoid diagnostic issues.

Details:

Connector Color: Black and Silver. Part Type: Nitrogen Oxide NOx Sensor. Connector Shape: Rounded Rectangle. Warranty Coverage: 1 Year.

Terminal Type: Pin. Connector Gender: Female. Terminal Gender: Male. Item Specifics Color: Silver.

Wire Gauge Measurement: 22 GU. Universal Or Specific Fit. Terminal Quantity: 6. Finish: Plain.

Reliable Performance: Engineered to meet or exceed OEM specifications for consistent operation and longevity.Durability: Manufactured using high-quality materials withstand the demands of everyday driving.Easy Installation: designed as direct-fit replacements, requiring minimal effort no special modifications.Wide Availability: Covers a broad range vehicle applications, making it easier find right part your car truck. Dorman parts are engineered to meet or exceed OEM standards, providing reliable performance, durability, and ease of installation. Package Contents: 1 Sensor With Module. Position: Downstream.

part #: 71ma380 price

• $326.34

specifications emissyste:

• for models: 2500, Sierra
• for makes: Gmc
• for years: 2011-2014
• brand: Dorman
• mpn: 71ma380
• part type: Sensor
• manufacturer warranty: 1 Year
• placement on vehicle: Downstream
• cs-sku: 328

offer emissyste:

• quantity: 1
• options: Ship-to-home
• started: February 25, 2026
• availability: In Stock
• sold: 0

shipping emissyste:

• cost: $0.00
• transit: 3-7 Days
• type: Fixed
• service: Standard
• class: Standard

payments emissyste:

• other
• credit card: Visa
• wallet: Apple-pay

returns emissyste:

• policy: Returns Accepted
• time: 30 Days
• paid by: Seller

seller emissyste:

• city: Bronx, New York
• # reviews: 138
• rating: 99.3%

general emissyste:

• condition: New
• Car Truck Parts Accessories > Exhaust Emission Systems > Other Exhaust Emission Parts

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