marc_mystic1
Seat Altea rough idle and fuel consumption
Summary of the thread
A 2004 Seat Altea is experiencing rough idling, high fuel consumption, and an illuminated check engine light. The suspected cause is a faulty knock sensor, potentially due to a bad wire or plug. A similar issue was resolved by addressing a corroded connector to the knock sensor, which was visually identifiable. The problem was ultimately fixed by repairing the bad connection at a local garage.
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4 comment(s)
marc_mystic1 (community.author)
When you say corroded connector, was it easy to spot, or did you need a multimeter to check it?
jonasschubert8
I could see the corrosion right away. But a multimeter is great for checking if the wiring is still connected. Because you think it's a bad connection, you should look closely at the wiring and connector. If that doesn't fix it, get a mechanic to take a look.
marc_mystic1 (community.author)
Cheers for the advice! It was a bad connection, just like you said. The local garage fixed it for 95€.
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SEAT
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ALTEA
jonasschubert8
The check engine light along with rough idling and high fuel consumption points to a possible knock sensor issue. A bad knock sensor can make the ECU pull back the ignition timing, which hurts performance and wastes fuel. I had the same thing happen with my Opel Astra, and it was a corroded connector going to the knock sensor. Have you checked the wiring and connector for damage or corrosion?