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.
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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 - -
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Here is a picture of the old and new temperature sending units side-by-side for comparison
| Here is a 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
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Procedure:
Items and Tools Needed:
- Updated, Green-Top Temperature Sending Unit (VW Part #059-919-501A)
- New O-Ring Seal (VW Part #N90316802)
- Retaining Clip (VW Part #032-121-142) (optional part incase you break existing clip)
- Flat-head Screwdriver
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Step 1:Remove the upper and lower engine covers to allow for easy access of the temperature sender.
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
Step 3:With the clip removed pull the temperature sender out. Unplug the 4-pin harness.
Step 4:Plug the new temperature sender (green) into the 4-pin harness.
Step 5:Insert the new sender and be sure to press it in firmly.
Step 6:Slide the retaining clip and ensure it is securely seated.
Step 7:Re-install the upper and lower engine covers.
Your finished!