touran auxilary heater

Hi everyone i have a 55 reg touran tdi and this year the auxilary heater is not working plugged in vag com and the following error codes are logged
01489 over temp sensor (G189)
010 open or short to plus intermittent

02251 heater unit locked which i understand happens after 5 attempts to fire up the unit

00664 fuel guage
002 lower limit exceeded intermittent

as ive attempted to clear the faults with no success obviously one or more of the above is causing the problem could someone tell me if the over temp sensor (g189) is located within the heater unit or somewhere else

Well I'm not familiar with this heater but


EOBD II Error Code: 02251

Fault Location:
Heater Unit Locked

Possible Cause:
Heater not working.
Heater Module refuses to clear Fault Codes.

Fuel Level low.

Possible Solutions:
When found in Aux Heater module of VW Touareg (7L), unlock heater module by saving a 1 in Adaptation Channel 003, then clear fault codes.
When found in Aux Heater module of VW Touran (1T, and similar models), unlock heater module by saving a 1 in Adaptation Channel 042, then clear fault codes.
When found in Aux Heater module of VW Transporter (7H), unlock heater module by saving a 1 in Adaptation Channel 003, then clear fault codes.
When found in Aux Heater module of Audi A8 (4E), unlock heater module by saving a 1 in Adaptation Channel 007, then clear fault codes.