emilia_becker79
Scenic preheating lamp stays on
Summary of the thread
A 2017 Renault Scenic diesel had issues with the preheating lamp staying on, the check engine light being illuminated, and smoke during acceleration. The suspected cause was a defective preheating control unit, possibly due to a bad cable or plug. Suggestions included checking the relay and fuses related to the preheating system. The problem was ultimately diagnosed as a defective cable to the preheating unit, which was repaired at a workshop.
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4 comment(s)
emilia_becker79 (community.author)
Thanks for the tip! Which relay and fuses do you mean exactly? Where did you find them, and how did you find out it was them?
jakob_flamme3
With my Opel, the relay and fuses for the preheating were in the engine compartment's fuse box. I consulted the car's manual to locate them. Considering your Renault Scenic's symptoms and your suspicion of a defective preheating control unit, a visit to the workshop seems advisable. They can precisely diagnose the electrical gremlins in your ignition system to fix the part that needs fixing.
emilia_becker79 (community.author)
Cheers, I took it to the workshop as you suggested. Turned out to be a defective cable to the preheating unit as I thought. Cost me 95€ to repair. All good now!
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RENAULT
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SCENIC
jakob_flamme3
Greetings! This sounds similar to an issue I encountered with my old Opel Astra. The diesel engine had preheating problems too. The glow plug light stayed on, and the car ran rough. Did you check the relay and fuses related to the preheating system? Perhaps there is a blown fuse or a faulty relay causing the problem, like a short circuit in your home.