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//Original Author: Anthony D'Anna - http://www.anthonydanna.com/contact.html
//Anthony D'Anna's Temperature Sender Replacement
//http://www.anthonydanna.com/vw/tempsender.htm
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Temperature Sender Replacement

WARNING: Before beginning this procedure, ensure you allow your engine to 
completely cool down. The system is pressured and if you remove your temperature 
sender while it is still hot, coolant will spray out and potentially cause severe 
burns. This mod was performed on a 2001 Volkswagen Jetta. I cannot gaurantee this 
will work on your vehicle. Work at your own risk. Installation times will vary 
upon the installer's experience. It took me about 15 minutes to complete this job. 

Description of error detected with a VAG-COM:
The following fault code was causing my CEL to come on. I would clear the code 
using my VAG-COM but it would come back within a short period of time.

17704 – Error in Mapped Cooling System (usually temp sensor or thermostat)
P1296 – 35-00 - -



Summary of part numbers related to this job

OLD -Temperature Sender (Black)
Part#: J78-919-501C

NEW/Updated - Temperature Sender (Green)
Part#: 059-919-501A

O-Ring
Part#: N90316802

Retaining Clip
Part#: 032-121-142



Procedure:
Items and Tools Needed:

1.) Updated, Green-Top Temperature Sending Unit (VW Part #059-919-501A) 
2.) New O-Ring Seal (VW Part #N90316802) 
3.) Retaining Clip (VW Part #032-121-142) (optional incase you break clip) 
4.) Flat-head Screwdriver 
 

Step 1: 
Remove the upper and lower engine covers to allow for easy access of the 
temperature sender. 
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Step 2: 
Remove the retaining clip that secures the temperature sender in place. Slide the 
pick into the small portion of the clip that can be seen. (between the plastic 
housing and edge of retaining clip). Pull the clip straight out with minimal force 
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Step 3: 
With the clip removed pull the temperature sender out. Unplug the 4-pin harness. 
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Step 4: 
Plug the new temperature sender (green) into the 4-pin harness. 
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Step 5: 
Insert the new sender and be sure to press it in firmly. 
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Step 6: 
Slide the retaining clip and ensure it is securely seated. 
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Step 7: 
Re-install the upper and lower engine covers. 
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Your finished!