miawolf22

Seat Arona Diesel Engine Power Loss

I am writing to seek your expertise regarding a potential issue with my 2020 Seat Arona diesel, which has approximately 198746 km on the odometer. Recently, the check engine light illuminated, and I have noticed a significant reduction in engine power, accompanied by poor engine response and occasional engine stalls at idle. Furthermore, fuel consumption has increased noticeably. I also hear a distinct whistling noise, along with a loud hissing sound when accelerating. Based on my research, I suspect a defect in the boost pressure system, potentially related to the wastegate valve. I have visually inspected the throttle body and intercooler, but I did not find any obvious damage. Could this be a boost control problem, or could a faulty MAP sensor cause these symptoms?

4 comment(s)

The symptoms you describe certainly point towards a boost pressure issue. Considering the mileage, a defect in the wastegate valve is plausible. Have you checked the pressure sensor readings? I had similar issues in the past with my old Volvo; turned out to be a cracked intercooler hose. It produced a loud hissing sound under acceleration.

Thank you for your prompt response. I have not checked the pressure sensor readings myself, as I lack the necessary diagnostic equipment. Could a faulty MAP sensor also cause these symptoms, or is the wastegate valve the more likely culprit given the whistling noise?

Given the whistling noise, the wastegate valve is the prime suspect. A faulty MAP sensor can cause similar issues, but the noise is more indicative of a mechanical failure in the wastegate. My advice is to take it to a reputable workshop for a thorough inspection. Replacing parts without a proper diagnosis can be costly and ineffective.

I appreciate you taking the time to share your experience. I took my Arona to a trusted local workshop. As you suspected, the wastegate valve was indeed faulty. The total repair cost came to 860€. Hopefully this resolves the issue permanently.

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