Try to erase the fault code with a obd2 code reader that have read and erase function.
SOURCE: Temp sensor needs to be replaced
this does not mean the sensor is defective, it most likely means the engine thermostat is stuck open and the engine is not running hot enough to satisfy the computers preset temp requirements for minimum eng operating temp.
SOURCE: Hi, 2003 Beetle / reset - clear faults
Im actually going through the process of fixing this problem with my car. the P2181 is a performance cooling error, usually brought up by thermostat, radiator issues, or ECT sensor. You should narrow it down and check both radiator and thermostat to prevent later issues. If all is well go to your local autozone, pep boys, checkers..etc. and have them erase the DTC error. If you are looking for a more long term solution you can purchase many different software such as VAG-COM or any other software used to run test on vehicals. Be sure you know what you are doing though because messing with your cars computer can have long term effects that can be pricey.
SOURCE: How do you reset engine check light on 2004 Subaru Outback?
u can clear/reset the check engine light either with a scan tool, hit clear codes, or u can just disconnect the battery, the scanner clearing method is preferred as disconnecting the battery can cause temporary stalling issues.
SOURCE: where to replace coolant temp sensor for 1998 grand jeep cherokee
Check this image...
...in the Section ZJ-Secc-8D-Ignition-Systems (page 5, fig. 10 and 11).
Good luck.
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