Check Engine Light Due to Ignition Component/Engine Coolant Temperature Sensor Failure on Volkswagen Jetta

Due to an ignition component and/or engine coolant temperature sensor failure, the Check Engine Light may illuminate. Replacement of the failed component will be necessary to correct this concern.

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Average mileage: 90,610 (35,000–167,275)
6 model years affected: 2000, 2001, 2002, 2003, more2004, 2005
31 people reported this problem
13 people shared problem details
check engine light has come on the code read p2181 which is cooling system malfunction. I have changed the ect sensor but still have the engine light on.
2002 Volkswagen Jetta112,000
Coolant System malfunction. It was only the water temperature sender. It is a $15 part and a 10 minute fix if you want to do it yourself. It is very easy. You will probably pay a couple hundred bucks if you take it to the shop.
Service engine soon light was lit, dealer determined the problem and replaced the temperature sender.
2001 Volkswagen Jetta167,275
my car would not pass smog, the check engine light goes off and on, now my car will not start.
Had the water pump and timing belt replaced and have been back numerous times because check engine light keep coming on. Have changed the temperature sensor and still come on..
CEL - changed the temp sender, but still have the problem
engine lite on dashboard (yellow) on as of august 2015, diagnosed by mechanic as coolant-sensor "troublemaker". repair has to wait,can not afford an other expense .Electrical problems are part of this product, as headlite,taillite,back-up,stoplites need repairs (replacements) on a by annual interval !
2000 Volkswagen Jetta136,368
Leak found in coolant temp
2004 Volkswagen Jetta149,099
Ignition light stays on n
2003 Volkswagen Jetta166,000
my car would have very rough start ups and at first i figured it was bad spark plugs until i researched it and found out it was a faulty coolant temp. sensor, after replacing the car no longer has rough start ups and i maintain regular 3 month maintanance
Replaced fan, thermostat, and coolant.
2001 Volkswagen Jetta125,000
My temp gauge goes up to 190 then drops back down on it's own.
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