ludwig_stern79

Seat Toledo Diesel Engine Power Loss

I've got this 2004 Seat Toledo, diesel engine, with about 78780 km on the clock. Recently, I've been experiencing reduced engine power. Hooked it up to a diagnostic tool and found an error stored in the error memory indicating a problem with the engine control unit. My guess is the ECU itself is defective, or maybe just a main relay defective. Has anyone experienced similar ECU problems or control system issues with their Seat or any other car?

4 comment(s)

Sounds like ECU problems, I had a similar issue with my old Renault Megane. Reduced engine power and error codes. In my case, it turned out to be a faulty sensor messing with the automotive electronics. Have you checked the wiring and connections to the computer module? Sometimes it's just a loose connector.

When you say sensor, do you remember which one it was? Also, how did you check the wiring? I'm not very experienced with automotive electronics. Is it something I can do myself, or should I just take it to a workshop for ECU repair?

I don't remember the exact sensor, sorry. I'm no expert either but I checked the visible parts of the cables for corrosion and if the connectors are firmly mounted to the sensors. Honestly, if you're not comfortable with automotive electronics, it's best to take it to a workshop that does ECU repair. It could save you time and prevent further damage to the computer module.

The garage confirmed it was the main relay causing ECU problems. They replaced it, cleared the error memory, and now my Seat Toledo runs like new. Cost me 120€. Thanks for the advice, really helped narrow down the problem!

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