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robertguenther81

Seat Ibiza Diesel Preheating Issue

My Seat Ibiza from is giving me headaches. The preheating lamp refuses to switch off, and the check engine light is now illuminated. It's a diesel engine. It's done about 59530 km. I've also noticed some smoke when accelerating. I'm suspecting a defective preheating control unit, possibly an electrical fault, maybe a bad cable or plug connection. Has anyone experienced something similar?

Summary of the thread

The Seat Ibiza is experiencing a persistent preheating lamp issue and an illuminated check engine light, accompanied by black smoke during acceleration. The suspected causes include a defective preheating control unit or an electrical fault, such as a bad cable or plug connection. The suggested solution is to inspect and possibly repair the wiring and connections to the preheating module, which was confirmed as the issue and resolved at a workshop.

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4 comment(s)

evamond27

Whoa, that sounds familiar! I had a similar issue with my old Renault Megane, although it was the glow plugs acting up. The preheating lamp stayed on, and the engine light popped up. Is the smoke whitish? With mine, it was like a James Bond smoke screen whenever I accelerated. I'd check all the wiring and connections to that heating module first, like you're planning. Could save you a bundle! Does it start okay even with the light on?

robertguenther81 (community.author)

The smoke is blackish, yes it starts, but a bit rough. The light stays on all the time. You mentioned checking the wiring... any specific areas I should focus on with that glow plug issue on your Renault?

evamond27

Black smoke is not good, but the light isn't either. On my Renault, the connections to the heating module itself were corroded. Basically, the thing wasn't getting the right signal. If you're not comfortable poking around with electrical stuff, maybe a workshop is the best bet. Could be a quick fix, and they can diagnose it properly. Beats guessing and potentially making it worse. I would still recommend you check the connections yourself. It's like checking if the toaster is plugged in before calling an electrician.

robertguenther81 (community.author)

Just wanted to say I took the Ibiza to the workshop. It was a defective cable or plug connection to the preheating control unit, like I thought. Repair was 95€. Thanks for the advice!

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SEAT

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IBIZA