Need Help in Solving the P2181 code error

2005 VOLKSWAGEN JETTA
101 MILES
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EECALPOLY
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I have 2005 vw jetta with 101k miles and the check engine light came on. Took to a local mechanic and an error code P2181 showed up. On his diagnostic software, it didn't display that code to make corrective actions. Did some research on the code and it refers to engine cooling. It seems complex.
How do I go about fixing it?
What specific parts are involved?
Are there manuals online I can refer to?
What tools are required?
Does youtube have vid on how to fix it?
Feb 25, 2012 at 11:02 PM
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BLUELIGHTNIN6
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This code is often caused by a faulty oxygen sensor on the VW Jetta. A fairly simple repair, the oxygen sensors are located on the exhaust, underneath the vehicle.
Feb 25, 2012 at 11:06 PM
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EXOVCDS
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Are you sure about that?
Feb 26, 2012 at 1:05 AM
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EECALPOLY
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It's not the o2 sensors. They were changed sometime ago. Code P2181 is related to engine cooling performance based on my research. The code was cleared and hasn't appeared as of yet over 40 miles.
Feb 28, 2012 at 4:57 AM
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EXOVCDS
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Faulty thermostats are common... they can be easily diagnosed by monitoring engine temp via scan tool. While at steady cruise, temp shouldn't drop below 80c.
Feb 28, 2012 at 5:12 AM
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EXOVCDS
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Alternativly, from a cold start, monitor the temperature of the upper & lower radiator hose
at idle. The lower hose should remain cool to the touch for quite some time, while the top
hose should get quite warm/hot.

If the lower hose gets warm before the top hose gets hot, the thermostat is opening too soon.
Feb 28, 2012 at 5:38 AM
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BLUELIGHTNIN6
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.
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Feb 28, 2012 at 8:08 PM
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EXOVCDS
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I think he knows that already....
Feb 29, 2012 at 2:31 AM
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EXOVCDS
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Here's VW's description (see picture)...for the Expert.
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Feb 29, 2012 at 11:05 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.