Seat Inca Diesel engine trouble

I am sorry to hear about the issues you are experiencing with your Seat Inca. I once encountered a similar situation with my Opel Astra, although the specific model differs. The symptoms you describe – engine light, reduced power, poor response, and higher fuel consumption – strongly suggest a problem with engine synchronization. Have you checked the timing belt recently? A worn timing belt can cause similar issues by throwing off the crankshaft to camshaft reference value. In my case, the error was intermittent at first, which made it difficult to diagnose initially. I recommend verifying the condition of the timing belt before replacing any sensors. Are there any stored misfire codes?

Thank you for your reply. You mentioned checking the timing belt. Is there a way to check it myself, or would you recommend taking it to a workshop? Also, what do you mean by "misfire codes"?

While you might be able to visually inspect the timing belt for obvious signs of wear (cracks, fraying), a thorough inspection often requires removing the timing belt cover, which can be tricky. Unless you have experience with this, I recommend having a qualified mechanic inspect it. By "misfire codes", I mean diagnostic trouble codes (DTCs) specifically indicating that one or more cylinders are not firing correctly. These codes, usually starting with "P030", can sometimes appear alongside crankshaft/camshaft correlation errors. Given the symptoms and the error code you're getting, and considering my prior experience, it's quite plausible that the crankshaft sensor is indeed the culprit, or the wiring. To avoid guesswork and potentially wasting money on unnecessary parts, I would advise taking your Seat to a workshop for a proper diagnosis. They should be able to confirm the sensor's functionality and rule out other possible causes.

Just wanted to say it was indeed the crankshaft sensor. The workshop replaced it, and the engine light is off. The car runs much better now. The whole thing cost me about 340€. Thanks for the help!