NTK Exhaust Gas Temperature Sensor - RN139J-CWE
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Product Information
Full details
The NTK Exhaust Gas Temperature Sensor (RN139J-CWE) is an essential diagnostic and performance component engineered for modern diesel engines to monitor thermal conditions within the exhaust stream. It is ideal for mechanics and DIY enthusiasts looking to maintain or restore engine efficiency, as it enables the ECU to precisely calibrate fueling and manage Diesel Particulate Filter (DPF) regeneration. While this sensor provides OEM-level accuracy and reliability, users must ensure the specific engine configuration and ECU mapping are compatible to avoid diagnostic error codes during installation.
All features
| Model Part Number | RN139J-CWE |
|---|---|
| Brand | NTK |
Extended Product Information
FAQs
What is the wire length of the RN139J-CWE?
The wire length of this sensor is 260mm.
Do I need to solder wires for this installation?
No, this sensor features an OEM-style plug that connects directly to the vehicle harness.
Why is the sensor important for DPF regeneration?
The ECU requires precise temperature data to initiate the regeneration cycle, which burns off accumulated soot in the filter.
Can I use this sensor on a gasoline engine?
This sensor is specifically designed for modern diesel engines and their exhaust temperature requirements.
Does this sensor come with a warranty?
Please consult your point of purchase for specific warranty coverage details regarding NTK electrical components.
Troubleshooting
Check Engine Light persists after replacement
Clear all diagnostic trouble codes (DTC) using an OBD-II scanner. The ECU often stores fault history that must be manually erased.
Sensor showing erratic readings
Check the wiring harness for signs of melting or pinching and ensure the electrical connector is fully seated until it clicks.
Pros and Cons
Pros
- Direct fit for easy replacement without specialized tools
- High-grade heat resistance for extended service life
- Ensures compliance with DPF regeneration requirements
- Superior sensor accuracy compared to generic aftermarket alternatives
Cons
- Specific to diesel engine exhaust systems
- Wiring length of 260mm may not fit all custom exhaust setups
- Requires ECU clear-out of old fault codes post-installation
Setup, Compatibility & Care
To install, ensure the engine is completely cool to avoid thermal injury. Locate the existing sensor on the exhaust manifold or downpipe, disconnect the harness, and unscrew the faulty unit using a deep socket or specialized EGT wrench. Install the new NTK sensor, ensuring the threads are free of debris, and torque to the manufacturer’s specification. Connect the factory plug securely. No modification is required; however, you must use an OBD-II scanner to clear any pre-existing check engine lights (CEL) associated with the exhaust system. To care for the sensor, avoid using harsh chemicals near the probe tip, as residue can impact thermal conductivity.