selinacrystal1
Peugeot 407 rough running cold starts
Summary of the thread
A 2004 Peugeot 407 diesel is experiencing rough running during cold starts, increased fuel consumption, and delayed cabin heating. The issue is suspected to be related to the PTC heater, which is confirmed by a diagnostic test at a garage. The suggested solution is to replace the defective PTC heater, with a repair cost quoted at 350€.
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4 comment(s)
selinacrystal1 (community.author)
Yeah, now that you mention it, the heater does seem to be taking its sweet time to actually get warm! So, you reckon it's definitely the electric auxiliary heater then? Where did you start looking to diagnose it? Is there a way to test it before I start ripping things apart?
jonathansturm1
That's what it was in my case, but I'm no mechanic. I went straight to a workshop - they confirmed it was the PTC heater not working properly. Best get it checked properly, these modern heaters can be a pain to diagnose without the right gear.
selinacrystal1 (community.author)
Appreciate the input! I took it to my local garage and they ran some tests. Turns out you were spot on – the PTC heater was indeed defective. Quoted me 350€ for the repair. Bit of a sting, but at least I know what the problem is now.
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PEUGEOT
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407
jonathansturm1
Sounds familiar. I've got a 407 diesel too and had similar symptoms last winter. Rough running on cold starts, and the fuel consumption was noticeably worse. Did you notice if the heating inside the car takes longer to warm up as well? It could be the heating element...