MERCEDES A3C02121700-01 Nox Sensor Benz SNS153C

( Manufacturer Part Number: A3C02121700-01 ), ( Part Type: Sensor ), ( Compatible Continental Nox Part Numbers: Sns1006 A3c01057700-01 Sns424b A2c15463300-02 ), ( Compatible A-class Models: A160d A180d A200d A220d Diesel Amg Line ), ( For Sale: 1x One Mercedes-benz A0009058111 Nox Sensor ), ( Compatible Mercedes-benz Part Numbers: Ma000905811180 A0009057208 A0009053109 ), ( Comaptible E-class Models: E200d E220d E300d E400d Diesel Bluetec 4matic ), ( Compatible Mercedes Benz Cars: W177 V177 W213 S213 C238 Gle W167 Cls C257 W257 ), ( Universal Fitment: No ), ( Country Of Origin: Czech Republic )

Review MERCEDES benz Genuine Nox Sensor fits CONTINENTAL

The **Mercedes-Benz A3C02121700-01 Continental SNS153C NOx Sensor** is a precision-engineered component designed to play a critical role in the emissions control system of modern diesel-powered Mercedes-Benz vehicles, ensuring compliance with stringent environmental regulations while optimizing engine performance. This high-quality sensor, manufactured by Continental, is a key part of the Selective Catalytic Reduction (SCR) system, which works in tandem with the exhaust aftertreatment to minimize harmful nitrogen oxide (NOx) emissions a primary contributor to air pollution. The SNS153C is a **NOx sensor with a wide measurement range**, capable of accurately detecting and monitoring NOx levels in real-time, allowing the vehicle s Electronic Control Unit (ECU) to adjust fuel injection, exhaust gas recirculation (EGR), and SCR dosing with millisecond precision. Built with robust materials and advanced sensor technology, this component features a **ceramic sensing element** encased in a durable metal housing, ensuring long-term reliability even under the demanding conditions of high-temperature exhaust streams. Its **self-diagnostic capabilities** enable the sensor to communicate directly with the vehicle s onboard diagnostics system, alerting the driver or technician to potential malfunctions through OBD-II trouble codes, such as P0420 or P2097, which may indicate issues with the NOx sensor itself or related exhaust components. Ideal for applications in Mercedes-Benz models equipped with Euro 5, Euro 6, or later emissions standards such as the **A-Class (W176), C-Class (W205/W206), E-Class (W213), or GLB (X253)** this sensor is a direct-fit replacement for the original equipment manufacturer (OEM) part, ensuring seamless integration without the need for additional modifications. Whether replacing a failed sensor due to contamination, thermal stress, or electrical failure, or upgrading an existing system for enhanced emissions control, the Continental SNS153C delivers the accuracy, durability, and performance expected from a Mercedes-Benz aftermarket solution. Its compatibility with advanced engine management systems also supports improved fuel efficiency and reduced emissions, aligning with both regulatory requirements and the growing demand for cleaner, more sustainable transportation.

### **Pros and Cons of Buying a Mercedes-Benz A3 (C02121700-01) with Continental SNS153C NOx Sensor**

1. **Reliability and Brand Prestige** Mercedes-Benz is a well-established automaker known for engineering quality, especially in its luxury and performance segments. The A3 (W203) is a well-built compact executive car with a reputation for durability, particularly when maintained properly.

2. **Performance and Driving Dynamics** The A3 offers a balanced blend of sportiness and comfort, with options for turbocharged engines (e.g., 1.6L or 2.0L) that provide strong acceleration. The manual transmission models are particularly praised for their engaging driving experience.

3. **Comfort and Interior Quality** The cabin is well-appointed with high-quality materials, ergonomic seating, and advanced infotainment systems (depending on the trim). The A3 s compact size makes it easy to maneuver in urban environments while still offering a spacious feel inside.

4. **Resale Value** Mercedes-Benz vehicles generally hold their value well, especially models like the A3 that are in demand among enthusiasts. A well-maintained example can retain a significant portion of its original value.

5. **Aftermarket and Customization Options** The A3 has a strong aftermarket presence, with availability of performance parts, tuning solutions, and aesthetic upgrades. This makes it easier to modify or enhance the vehicle over time.

6. **Safety Features** Depending on the model year, the A3 may include advanced safety technologies such as stability control, multiple airbags, and driver-assistance systems (e.g., ESP, pre-safe systems). Later models may also feature adaptive cruise control or lane-keeping assist.

7. **Fuel Efficiency (Compared to Competitors)** While not the most efficient car on the market, the A3 s turbocharged engines offer better fuel economy than naturally aspirated alternatives, and diesel models (if available) can be particularly economical for highway driving.

8. **Potential for Low Mileage or Well-Maintained Examples** If you find an A3 with low mileage or a comprehensive service history, it could be a sound long-term investment. Some owners treat their Mercedes-Benz as a premium asset, ensuring it remains in excellent condition.

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1. **High Maintenance and Repair Costs** Mercedes-Benz vehicles are known for expensive parts and labor costs. The NOx sensor issue (SNS153C) is a common problem in diesel models, but even gasoline models can incur significant expenses for routine maintenance (e.g., timing belt, suspension components, or electrical systems). Independent mechanics may also charge more than dealerships.

2. **NOx Sensor and Emissions Issues** The Continental SNS153C NOx sensor is a critical component for diesel engines, particularly in models compliant with Euro 5 or later emissions standards. Common problems include:

- **Faulty or failing sensors** leading to check engine lights and reduced performance.

- **High replacement costs** (often $500 $1,500 per sensor, depending on labor and parts).

- **Recurring issues** if the underlying cause (e.g., exhaust leaks, fuel system problems, or turbocharger wear) isn t addressed.

- **Potential for dealership upselling** to replace multiple sensors or perform unnecessary diagnostics.

If the car has a history of NOx sensor failures, this could become a recurring financial burden.

3. **Electrical Gremlins** Mercedes-Benz vehicles, especially older models, are notorious for electrical system quirks. Issues such as faulty window regulators, infotainment glitches, or sensor malfunctions (e.g., speed sensor, mass airflow sensor) are not uncommon. These problems can be frustrating and costly to repair.

4. **Depreciation** While Mercedes-Benz retains value better than many brands, the A3 (like all cars) still depreciates over time. If you plan to keep the car long-term, the cumulative cost of ownership (including maintenance and potential repairs) may outweigh the resale value.

5. **Insurance Costs** Luxury cars like the A3 typically have higher insurance premiums due to their value and repair costs. This can add a significant ongoing expense.

6. **Rust and Bodywork Concerns** Older A3 models (pre-2010) may suffer from rust, particularly in areas like the wheel arches, sills, and undercarriage. A thorough inspection of the bodywork is essential to avoid buying a car with hidden structural issues.

- **Rear seat comfort** is adequate but not luxurious for long trips.

- **Cargo space** is tight compared to larger sedans or SUVs.

- **Towing or heavy-duty use** is not recommended, as the chassis and drivetrain are not designed for such applications.

- **Higher upfront cost** compared to gasoline alternatives.

- **Diesel particulate filters (DPF) and exhaust gas recirculation (EGR) issues**, which can lead to costly repairs if the car is driven mostly in stop-and-go traffic.

- **Fuel availability** Diesel is less common in some regions, making refueling inconvenient in certain areas.

- **Unexplained service records** (e.g., frequent oil changes, transmission fluid flushes, or suspension replacements).

- **Accident or flood damage** if not properly inspected.

- **Transmission issues** (e.g., jerking, delayed shifting), which can be expensive to repair, especially in automatic models.

10. **Market Saturation** The A3 is a popular used car, meaning there is often strong competition among buyers. This can drive up prices, making it harder to find a truly bargain-priced example unless you re willing to compromise on condition or mileage.

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Buying a Mercedes-Benz A3 (C02121700-01) with a Continental SNS153C NOx sensor can be a rewarding experience if you prioritize driving dynamics, brand prestige, and long-term reliability. However, the potential for high maintenance costs particularly related to the NOx sensor, electrical systems, and general wear must be carefully considered. The decision hinges on your budget, willingness to invest in upkeep, and how you plan to use the vehicle.

If you are prepared for the possibility of recurring sensor replacements (or have already budgeted for them), the A3 remains a capable and enjoyable car. Conversely, if you are on a tight budget or seeking a low-maintenance vehicle, the risks may outweigh the benefits.

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1. **Thorough Pre-Purchase Inspection (PPI)** Before buying, have a trusted mechanic (preferably one experienced with Mercedes-Benz) perform a detailed inspection. Focus on:

- The condition of the NOx sensor and exhaust system.

- Electrical components (sensors, wiring, infotainment).

- Suspension, steering, and braking systems.

- Service history to verify maintenance records.

- Replacing the NOx sensor (or multiple sensors if the issue is recurring).

- Addressing any underlying causes (e.g., exhaust leaks, turbocharger wear).

- Routine maintenance (timing belt, fluids, filters).

3. **Consider a Gasoline Model** If the NOx sensor issue is a concern, a gasoline-powered A3 (e.g., 1.6L or 2.0L) may be a safer choice, as it avoids diesel-specific problems like DPF clogging.

4. **Negotiate Based on Known Issues** If the seller is aware of NOx sensor problems or has a history of repairs, use this information to negotiate a lower price.

- A well-maintained BMW 3 Series or Audi A4 (similar driving dynamics but sometimes more reliable).

- A used luxury compact hatchback from a more budget-friendly brand (e.g., Volvo, Lexus).

- A newer A-Class (W177) if you prefer a more modern platform with improved reliability.

6. **Short-Term vs. Long-Term Ownership** If you plan to keep the car for 5 10 years, factor in the total cost of ownership (purchase price maintenance insurance depreciation). If you re only looking for a 2 3 year vehicle, the A3 could still be a fun and capable choice, provided you mitigate the risks.

The Mercedes-Benz A3 is a compelling car for enthusiasts who appreciate its driving feel and luxury, but it requires careful consideration of its maintenance demands. If you are financially prepared for potential NOx sensor and other repair costs, and if the car passes a rigorous inspection, it can be a great purchase. Otherwise, explore alternatives that align better with your budget and long-term goals.

Details:

Mercedes Benz Diesel NOx Sensor Ad Blue SCR SNS153C A3C02121700-01 12:31 /-strong /-heart: >: o: - : -hi.

part #: a3c0212170001 prices

• $159.90-$415.00

specifications emissyste:

• for models: Continental
• for makes: Mercedes
• mpn: A3c02121700-01
• part type: Sensor
• compatible continental nox part numbers: Sns1006 A3c01057700-01 Sns424b A2c15463300-02
• compatible a-class models: A160d A180d A200d A220d Diesel Amg Line
• for sale: 1x One Mercedes-benz A0009058111 Nox Sensor
• compatible mercedes-benz part numbers: Ma000905811180 A0009057208 A0009053109
• comaptible e-class models: E200d E220d E300d E400d Diesel Bluetec 4matic
• compatible mercedes benz cars: W177 V177 W213 S213 C238 Gle W167 Cls C257 W257
• universal fitment: No
• country of origin: Czech Republic

seller emissyste:

• rating: 96.8%
• city: Edmond, Oklahoma
• # reviews: 189

payments emissyste:

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

returns emissyste:

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

offer emissyste:

• started: May 11, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock
• best offers: True
• quantity: 1

shipping emissyste:

• service: USPS Ground Advantage
• transit: 3-8 Days
• cost: $8.06
• carrier: USPS
• type: Calculated
• class: Standard

general emissyste:

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

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