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Correct Coolant Temp Sensor


HoneyIShrunkThePolo
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Engine code AHT.

Confused on what coolant temperature sensor I have to buy? 
I bought one with a short flat head and only 2 contacts.
I know I need 4 contacts, but there are sensors with short flat heads and long narrow heads (Hope I'm making sense...).
Thing is, does the type of head on the sensor make any difference?

If anyone is wondering why I'm asking, and if you have any insight on the issue, my Lupo idles poorly and stalls when cold, when it warms up it's okay. Also most of the time the temp gauge doesn't work properly. So I thought the sensor might be the problem.

For-VW-PASSAT-B4-B5-B6-POLO-GOLF-1234567-SHARAN-TRANSPORTER-4-T4-LUPO-VENTO-Water.jpg_q50.jpg

s-l400.jpg

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