marvinstorm15
Aygo rough running on start PTC heater fault
Summary of the thread
A 2006 Toyota Aygo diesel was experiencing rough running on startup and increased fuel consumption, with an error code related to the heater. The issue was identified as a problem with the Positive Temperature Coefficient (PTC) heater, which assists with warming during cold starts. A mechanic confirmed and replaced the faulty PTC heater, resolving the rough running and restoring normal fuel consumption.
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4 comment(s)
marvinstorm15 (community.author)
PTC heater? I've never even heard of that! Where exactly is that located, and how would I go about checking if the heating element is working properly? I'm not the most mechanically inclined, so please keep it simple!
raphael_koch1
Given your description and limited technical expertise, further DIY diagnosis may be challenging. It would be prudent to have a qualified mechanic inspect the electric auxiliary heater. A defective unit could indeed cause the poor running and increased fuel consumption you're experiencing. Expect a repair cost in the region of 350€.
marvinstorm15 (community.author)
Thanks so much for the info! I took it to a local garage and they confirmed it was the PTC heater. They replaced it, and now the car is running perfectly again. Fuel consumption is back to normal too. Cheers!
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TOYOTA
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AYGO
raphael_koch1
The symptoms you describe, coupled with a heater-related error code, strongly suggest a problem with the Positive Temperature Coefficient (PTC) heater, sometimes referred to as an electric auxiliary heater. This is designed to assist with cabin and engine warming during cold starts. Is the blower motor functioning correctly? Have you checked the heating element?