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Jeep1945

Jaguar XJ: Reduced engine performance despite fault-free Carly

I own a 2006 Jaguar XJ with a diesel engine and 151,000 km mileage. I have the problem that my vehicle displays 'Reduced Engine Power', although my Carly diagnostic device does not detect any fault. What possible errors could Carly overlook? Has anyone had similar experiences or tips on how I can further narrow down the problem?

(Translated from German)

4 comment(s)

CarlyMechanic

Check the throttle body for any carbon buildup or mechanical issues, as this can sometimes cause 'Reduced Engine Power' without triggering a fault code. Let me know if cleaning or inspecting the throttle body helps, or if you have any further questions.

Jeep1945 (Author)

The throttle control check revealed no irregularities. When fully closed, it sometimes remains "closed". Behind it in the air duct is another sensor, which was completely oiled and coked. I cleaned this. We will see if the error occurs again.

(Translated from German)

CarlyMechanic

Quotation:

@Jeep1945 wrote on

The throttle control check revealed no irregularities. When fully closed, it sometimes remains "closed". Behind it in the air duct is another sensor, which was completely oiled and coked. I cleaned this. We will see if the error occurs again.

Try this method to reprogram your key fob: Insert the key into the ignition and turn it to position I (accessory) and back to the off position four times within six seconds. Then, remove the key. Within 10 seconds, press any button on the key fob. If successful, the car should lock and unlock to confirm. If this doesn't work, let me know, and we can explore other options.

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