On my Audi TT I have an engine light that recently started appearing. I hooked up an OBD scan tool and it reads code 4528- which means a engine cooling malfunction. Does anyone know what that means?

 

4528 is not a P code.

 

Replace the coolant temperature sensor. Could also be a thermostat malfunction but most likly cause is the temp sensor.

 

thanks i wll try it this weekend. Also, why does my OBD tool not use the P system of codes?

 

Some scan tools use their own little numbering system. Even the vw/audi scan tools use a different system. However it also shows the p code. There isnt much info about p codes in the repair manuel thou. You have to use the audi code.