emil_drache6
Seat Formentor Diesel Reduced Engine Power
Summary of the thread
A 2021 Seat Formentor with a diesel engine is experiencing reduced engine power, with a diagnostic code indicating a defective engine control unit (ECU). The initial suspicion is a faulty main relay, which could cause the ECU to malfunction. After further investigation, it is confirmed that the main relay was indeed defective, leading to the ECU issue, which was resolved with a repair costing 120€.
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4 comment(s)
emil_drache6 (community.author)
Good point about the error codes; should have included that. It's showing code P0606, which points to the engine control unit itself. Thoughts? Does this still sound like the main relay?
saraheagle21
P0606 definitely points towards an internal ECU fault. While a faulty relay could contribute, the error code suggests the ECU itself is compromised. Given the age and mileage, it's plausible. I would advise having a workshop confirm the diagnosis, as ECU issues can be complex. Time to get it professionally checked.
emil_drache6 (community.author)
It was a defective main relay, like I thought. The ECU repair was 120€. Thanks for the help.
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saraheagle21
Sounds like a potential ECU issue. Have you checked the wiring harness for damage or corrosion? What error codes are stored? That's crucial for diagnosing electronics problems like this. A defective main relay could cause the computer module to malfunction, leading to reduced engine performance.