Jaguar XJR (2011-2017) Engine Coolant Temperature Sensor Guide
Keep your XJR's supercharged V8 running perfectly by understanding this critical sensor.
- A bad ECT sensor can cause a Check Engine Light, poor fuel economy, black smoke, and overheating in your XJR.
- Common fault codes include P0117 (low input) and P0118 (high input).
- While replacing the sensor, check for coolant leaks from plastic pipes, a known issue on the 5.0L V8 engine.
- For this critical part, consider a premium aftermarket brand like NGK or Standard Ignition for reliability close to OEM.
Is Your XJR's Engine Coolant Sensor Failing?
A faulty Engine Coolant Temperature (ECT) sensor can cause a range of problems in your 2011-2017 Jaguar XJR. Because the sensor's signal is used for so many engine functions, a bad reading can confuse the vehicle's computer. This can lead to poor performance and, if ignored, potential engine damage.
Common Symptoms of a Bad ECT Sensor:
🎬 Watch: A visual guide to symptoms of a bad sensor.- Check Engine Light: This is often the first warning. The computer will log a fault code when it detects a problem with the sensor's signal.
- Poor Fuel Economy: If the sensor sends a false "cold" signal, the ECU will enrich the fuel mixture, causing your XJR to use more gas than necessary.
- Black Smoke from Exhaust: A very rich fuel mixture from a bad sensor signal may not burn completely, resulting in black smoke from the tailpipe.
- Engine Overheating or Erratic Temperature Gauge: A faulty sensor might not tell the cooling fans to turn on when needed, leading to overheating. You might also see the temperature gauge on your dash behave strangely, either not moving at all or jumping to hot suddenly.
- Rough Idle and Hesitation: The wrong fuel mixture can make the engine run poorly, especially at idle or during acceleration.
Related Cooling System Issues
While the sensor itself can fail, be aware of other cooling system problems on the 5.0L V8 engine. Jaguar issued a Technical Service Bulletin (TSB JTB00566NAS4) for potential coolant leaks from plastic coolant pipes. An engine overheat message could be caused by a leak rather than a sensor failure. Always check for visible coolant leaks around the front of the engine and under the vehicle.
🎬 See how to identify leaks from the front crossover pipe.Choosing the Right Aftermarket Sensor
For a precision vehicle like a Jaguar XJR, selecting a quality replacement part is important. While an OEM sensor from a Jaguar dealer is always an option, several reputable aftermarket brands offer reliable alternatives at a lower cost. Sensors are not universal, so you must buy one specified for your vehicle's year and model.
- Premium Aftermarket (e.g., NGK, Standard Ignition): These brands are often trusted by professional mechanics. They have a strong reputation for producing sensors that meet or exceed original equipment (OE) specifications. For a critical sensor on a high-performance engine, these brands are a safe bet.
- Standard Aftermarket (e.g., Walker Products, Four Seasons): These are well-known brands that produce a wide range of automotive parts. They market their products as being tested to OE standards and are a good balance between cost and quality.
- Value-Oriented (e.g., Global Parts, True Tech): These brands offer the most budget-friendly options. They can be a good choice for a quick repair, but may not have the same long-term reliability or stringent quality control as premium brands.
Pro Tip: Check the Connector
Before ordering, visually inspect your XJR's current ECT sensor and its electrical connector. Over time, the plastic connector can become brittle and break during removal. Some aftermarket sensors come with a new pigtail connector, which can be helpful if yours is damaged.
Cost of Replacing the ECT Sensor on a 2011-2017 Jaguar XJR
| Part or Service | Estimated Cost |
|---|---|
| New Aftermarket ECT Sensor | $20 - $62 |
| Shop Labor | $90 - $180 |
| Total Estimated Cost (Aftermarket Part) | $110 - $242 |
Note: Costs are estimates and can vary based on your location, the specific part brand chosen, and the repair shop's labor rates.
Frequently Asked Questions
Where is the ECT sensor located on the 2011-2017 Jaguar XJR?
The engine coolant temperature sensor is typically located at the front of the engine, near the thermostat housing where the large upper radiator hose connects to the engine.
Can I drive my XJR with a bad ECT sensor?
It is not recommended. While the car may run, you risk poor performance, high fuel consumption, and potentially severe engine damage from overheating. It's best to get it diagnosed and repaired as soon as possible.
Are there any recalls for this part?
As of late 2024, there are no specific recalls for the engine coolant temperature sensor on the 2011-2017 Jaguar XJR. Searches found recalls for coolant heaters on other Jaguar models, but not for this specific part and vehicle.
Do I need to drain the coolant to replace the sensor?
You do not need to drain the entire system. However, since the sensor sits in a coolant passage, some coolant will spill out when you remove it. Have the new sensor ready to install quickly to minimize loss. It's best to perform the replacement when the engine is completely cool to avoid being burned by hot coolant. You may need to top off the coolant reservoir after the job is done.
🎬 Watch: Time-saving tips for replacing your engine coolant temperature sensor.Helpful Videos
Technical Specifications
OEM Part Numbers: C2Z19929 AJ813917
Typically a 2-pin, brass-tipped thermistor sensor that screws into a coolant passage near the thermostat housing.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Jaguar XJR:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your XJR's Engine Coolant Sensor Failing?
- Common Symptoms of a Bad ECT Sensor:
- Related Cooling System Issues
- Choosing the Right Aftermarket Sensor
- Pro Tip: Check the Connector
- Cost of Replacing the ECT Sensor on a 2011-2017 Jaguar XJR
- Frequently Asked Questions
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