adrian_braun1
Siena outside temperature sensor fault
Summary of the thread
A 2004 Fiat Siena diesel is experiencing issues with the outside temperature sensor, leading to problems with the air conditioning, spray nozzles, and mirror heating. The problem is constant, suggesting a defective sensor or wiring issue. Initial suggestions include checking the cable and plug connections, but due to a lack of tools for in-depth diagnostics, professional intervention is recommended. The issue was resolved at a workshop, where a defective cable connection was repaired.
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4 comment(s)
adrian_braun1 (community.author)
The issue appears to be constant. I have visually inspected the connections and they appear intact, but I lack the tools for in-depth sensor diagnostics or calibration. Are there specific tests I should be performing before considering professional intervention?
annameier2
Okay, constant issues point more strongly to a defective sensor or wiring issue. Given your description and lack of specialized tools, I'd advise against any further DIY attempts. It's quite possibly a cable or plug connection issue. A workshop will be able to properly diagnose the cabling and the sensor itself. Going there will be the best decision.
adrian_braun1 (community.author)
Thank you for the advice. I took the vehicle to a workshop. The issue was indeed a defective cable connection to the outside temperature sensor, and the repair cost was 95€.
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FIAT
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SIENA
annameier2
Interesting. I had a similar problem with my Siena. Does it happen intermittently, or is it constant? Also, have you checked the cable and plug connection to the sensor itself? That's usually the culprit. And what about sensor calibration?