VEMO CR21J9 Exhaust Temperature Sensor Vw

( Brand: Vemo ), ( Manufacturer Part Number: CR21J9 ), ( Part Type: Exhaust Sensor ), ( Product Warranty: 12 Month Warranty ), ( Part Info: Exhaust Gas Temperature ), ( Years: 2014 2013 2015 14 13 15 ), ( Makes: Audi Volkswagen ), ( Models: Q5 A6 Quattro A7 Quattro A8 Quattro Q7 Touareg ), ( Important: Please Read All Notes Before Making This Purchase ), ( Cs-sku: 400 )

Review VEMO Exhaust Temperature Sensor Audi Vw fits QUATTRO TOUAREG Q5 A6 A7 A8 Q7 2013–2015

The **VEMO CR21J9 Exhaust Temperature Sensor** is a high-performance, precision-engineered replacement part designed specifically for Audi, Volkswagen, and Porsche models, including the **Q5, A6 Quattro, A7, A8, Q7, and Touareg** (as well as other compatible vehicles in the VW Group s 3C and 3D platforms). This sensor is a critical component of your vehicle s exhaust system, playing a vital role in optimizing engine performance, fuel efficiency, and emissions compliance by monitoring real-time exhaust gas temperatures. Crafted with meticulous attention to detail, the VEMO CR21J9 adheres to strict OEM specifications, ensuring seamless integration with your vehicle s ECU (Engine Control Unit) and diagnostic systems. Built with durable, corrosion-resistant materials, this sensor is engineered to withstand the harsh conditions of high-temperature exhaust environments, delivering reliable readings even under extreme operating conditions. Its robust construction minimizes the risk of premature failure, providing long-term durability and peace of mind for discerning drivers who demand both performance and reliability. Whether you re restoring an older model or upgrading a modern high-performance vehicle, the VEMO CR21J9 offers a direct-fit, plug-and-play solution that restores factory accuracy and functionality, ensuring your vehicle s emissions system operates at peak efficiency while maintaining compliance with modern regulations. Ideal for mechanics, DIY enthusiasts, and fleet operators, this sensor combines precision engineering with cost-effective performance, making it an indispensable upgrade for any vehicle owner seeking to maintain optimal engine health and emissions control.

Buying the **VEMO CR21J9 Exhaust Temperature Sensor** for Audi/VW models like the Q5, A6 Quattro, A7, A8, Q7, or Touareg can be a practical solution for diagnosing exhaust system issues, but it has both advantages and drawbacks depending on your needs.

### **Pros of the VEMO CR21J9 Exhaust Temperature Sensor**

1. **Accurate Temperature Monitoring** The sensor provides real-time exhaust gas temperature readings, helping detect issues like clogged catalytic converters, exhaust leaks, or turbocharger problems before they cause major damage.

2. **Easy Installation** Designed as a plug-and-play solution, it connects directly to the OBD-II port without requiring wiring modifications. It works with most modern Audi/VW vehicles that support OBD-II diagnostics.

3. **Compatibility with Diagnostic Tools** Works with aftermarket scan tools (like VCDS, OBDLink, or ELM327 adapters) and some stock diagnostic interfaces, allowing for deeper fault code analysis.

4. **Preventive Maintenance** Helps identify potential exhaust system failures early, reducing the risk of costly repairs down the line.

5. **Cost-Effective Alternative to Stock Sensors** If the original exhaust temperature sensor fails, replacing it with a new OEM part can be expensive. This sensor offers a lower-cost diagnostic solution before committing to full replacement.

6. **Useful for Tuning & Performance Monitoring** Some enthusiasts use it to monitor exhaust temperatures during tuning or forced induction setups to ensure safe operating limits.

### **Cons of the VEMO CR21J9 Exhaust Temperature Sensor**

1. **Not a Permanent Fix** This is a diagnostic tool, not a replacement part. If the original sensor is damaged, you ll still need to replace it eventually.

2. **Requires Additional Equipment** To read the data, you need a compatible scan tool or software (e.g., VCDS, Torque, or a basic OBD-II reader). Some users may already have these, but others may need to purchase them separately.

3. **Limited to Diagnostic Use** Unlike a full exhaust system upgrade, this sensor only provides temperature readings it doesn t improve performance or fix existing issues.

4. **Potential Signal Interference** If the vehicle s original sensor wiring is damaged, the aftermarket sensor may not function correctly, requiring additional troubleshooting.

5. **Not All Models Support It** While it works on many Audi/VW models, some newer or modified vehicles may require additional setup or may not recognize the sensor properly.

6. **Quality & Durability Concerns** Some users report that aftermarket sensors can degrade over time, especially in high-heat environments. The VEMO brand is generally reliable, but longevity depends on installation and usage conditions.

### **Conclusion & Recommendation**

The **VEMO CR21J9 Exhaust Temperature Sensor** is a **valuable diagnostic tool** for Audi/VW owners who want to monitor exhaust temperatures without replacing the original sensor. It is particularly useful for:

- Detecting early signs of catalytic converter failure

- Identifying exhaust leaks or turbo issues

- Preventing costly engine damage from overheating

- Supporting tuning and performance monitoring

However, it is **not a replacement part** and requires additional diagnostic equipment to function. If you experience persistent exhaust temperature issues, you should still have the original sensor inspected or replaced by a professional.

- **Buy it if:** You want an affordable way to monitor exhaust temperatures before committing to repairs, have access to a compatible scan tool, and are comfortable with basic diagnostics.

- **Skip it if:** You only need a quick check and don t plan to use advanced diagnostic tools, or if your vehicle s original sensor is already confirmed faulty and needs replacement.

For most owners, this sensor is a **smart investment** for long-term vehicle health, especially if you drive a high-mileage or performance-oriented Audi/VW. Pair it with a reliable scan tool (like VCDS) for the best results.

Details:

Make model Years Sub model Engine, Fit Notes: From 05/27/ 2013, AudiQ7 2013 TDI Premium3.0L V6, Premium Plus3.0L Prestige3.0L V6. Audi A7 Quattro 2014 TDI Prestige 3.0L V6. Make model Years Sub model Engine, Fit Notes: From 09/09/ 2013 ; To 03/17/ 2014, AudiQ5 2014 TDI Premium Plus3.0L V6, Prestige3.0L V6. Audi A7 Quattro 2014 TDI Premium Plus 3.0L V6.

part #: cr21j9 prices

• $62.22-$113.83

specifications emissyste:

• for models: Q5, A6, A7, A8, Q7, Quattro, Touareg
• for makes: Audi
• for years: 2013-2015
• brand: Vemo
• mpn: Cr21j9
• part type: Exhaust Sensor
• product warranty: 12 Month Warranty
• part info: Exhaust Gas Temperature
• years: 2014 2013 2015 14 13 15
• makes: Audi Volkswagen
• models: Q5 A6 Quattro A7 Quattro A8 Quattro Q7 Touareg
• important: Please Read All Notes Before Making This Purchase
• cs-sku: 400

shipping emissyste:

• transit: 4-7 Days
• carrier: FedEx
• type: Fixed
• service: FedEx Ground / FedEx Home Delivery
• cost: $0.00
• class: Standard

general emissyste:

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

payments emissyste:

• other
• wallet: Paypal
• credit card: Diners-club

returns emissyste:

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

seller emissyste:

• city: San Diego, California
• # reviews: 68776
• rating: 98.8%

offer emissyste:

• sold: 0
• started: June 6, 2026
• availability: In Stock
• quantity: 1
• options: Ship-to-home

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