johannes_thunder3
Seat Leon Hybrid Check Engine Light Issue
Summary of the thread
A 2021 Seat Leon hybrid had a recurring check engine light issue, suspected to be related to the air valve. The problem was identified as a defective hose connection from the pump to the air valve, causing a vacuum leak. The solution involved replacing the faulty hose connection, which resolved the issue and cleared the check engine light.
Did this summary help you solve your problem?
4 comment(s)
johannes_thunder3 (community.author)
Hissing sounds, you say? I haven't specifically listened for that. Where exactly should I be checking around the air intake? Any particular spot prone to leaks?
ameliehunter1
Listen closely around where the air supply hose connects to the air valve, and also where it connects to the pump. A small crack can cause a big vacuum leak, messing with the manifold pressure readings. If you're not comfortable poking around, might be worth a quick trip to a workshop. They can diagnose it properly. It sounds like what I experienced and it was a quick fix at the shop.
johannes_thunder3 (community.author)
It was the air valve. Faulty hose connection caused a vacuum leak. Replacement cost 175€. Check engine light is gone. Thanks for the insight.
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
LEON
ameliehunter1
I had a similar issue with my Leon, though it's an earlier model. Check engine light kept popping up. Have you checked for any hissing sounds around the air intake? Could be a vacuum leak affecting the manifold pressure.