Ive got this code through on my 2001 1.8t 8l, just the sport, and ive done a little research myself, and it seems to come up with the same 2 issues, thermostat, and temp sensor? and idea how to narrow it down? Cheers!!
17704/P1296/004758 - Error in Mapped Cooling System
Cold start issues
Coolant Temperature Sensor (G62) faulty
Coolant Thermostat faulty
Check Coolant Temperature Sensor (G62)
Check Coolant Thermostat
Check the stored Freeze Frame data with this fault code. Freeze Frame information will be found in the fault code description (if the module supports it) or in Generic OBD-II if the vehicle complies with those regulations.
Freeze Frame data stored at -40 Â°C is generally an indication of a faulty ECT or wiring.
Freeze Frame data stored at +140 Â°C is generally an indication of a faulty ECT or wiring.
Freeze Frame data stored with in the 60-80 Â°C range is an indication that the vehicle was close to, but not within, the cooling systems normal operation range. The Thermostat itself or Cooling system components may be at fault.
What temp is indicated on the dash?... normally its a faulty CTS but if the temp doesn't get to 90 at all it could be the stat... stats are around a tenner, CTS 15-20 quid from a dealer (pattern parts are prone to failure)