marc_mystic1

Seat Altea rough idle and fuel consumption

My 2004 Seat Altea with a gasoline engine is causing me problems. The check engine light is on, it idles roughly, and it's burning a lot of fuel. I suspect the knock sensor. Could it be a faulty wire or plug?

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.

Did this summary help you solve your problem?

4 comment(s)

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?

When you say corroded connector, was it easy to spot, or did you need a multimeter to check it?

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.

Cheers for the advice! It was a bad connection, just like you said. The local garage fixed it for 95€.

rmh_community_comment_box_header

community_crosslink_scanner_headline

community_crosslink_scanner_intro

community_crosslink_scanner_title

community_crosslink_scanner_price

community_crosslink_rmh_headline

community_crosslink_rmh_intro

community_crosslink_rmh_title

community_crosslink_rmh_subtitle

community_crosslink_rmh_brand

SEAT

community_crosslink_rmh_model

ALTEA