gertschaefer1
Lexus IS Diesel Cold Start Issue
Summary of the thread
A 2012 Lexus IS diesel is experiencing poor performance during cold starts and increased fuel consumption, with a diagnostic error indicating a potential issue. The problem is suspected to be related to the PTC heater, which may be causing the engine to strain and consume more fuel. It is advised to have the PTC heater checked and possibly replaced by a qualified workshop to resolve the issue.
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4 comment(s)
gertschaefer1 (community.author)
Thanks for the quick reply! I hadn't specifically noticed the air temperature, but now that you mention it, it does seem to take longer to warm up than it used to. Is this something that requires immediate attention, or can it wait a bit? Are there any temporary solutions?
felixmeier1
Okay, that makes the PTC heater issue even more likely. While it won't leave you stranded, a defective auxiliary heater can definitely strain the engine and increase fuel consumption, especially in colder weather. There aren't really any temporary fixes I know of. I'd advise getting it checked by a qualified workshop soon. Repair costs should be around 350€.
gertschaefer1 (community.author)
Thank you so much for your help and clarification! I'll book an appointment with my local mechanic to get the PTC heater checked and replaced. I really appreciate your assistance!
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LEXUS
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IS
felixmeier1
The symptoms you describe – poor cold start, error codes, increased fuel consumption – certainly point towards a potential issue with your Lexus's electric auxiliary heater (PTC heater). Has it been blowing noticeably colder air than usual, especially during the first few minutes after starting the engine? That would further confirm it.