My Polo TDI is hard to start especially in the morning. The glow plug light was on sometime back and i took it in for service at a VW dealership and the light was off. They did not replace the glow plugs. What can be the problem?

SOURCE: my golf gt tdi glow plug light keeps flashing

check to see if your brake lights are working.usually the stop light switch fails and is the cause.but before buying a new one check the stop light fuse.its a common problem with a simple fix.hope this helps.

SOURCE: MY GLOW PLUG LIGHT IS FLASHING IN MY DASH BOARD VW

Despite what you may read from other comments....The glow plug light is simple a multi function warning light and IS among many othed things in fact used to warn of brake light and brake light switch failure. Therefore it can NOT be treated as glow plug problems only.
I have worked on V.W for many years and have encountered this problem many times. You should get the OBD codes read. This will reveal the exact problem...and there may be more than one
You can contact your V,W agents if you wish and check to see if I am correct.
Best of luck
John

SOURCE: had problems with vw caddy van starting when warm,...

2004 vw 2000sdi caddy van wont start some mornings you need to wind it over before it fires, immediately after it fires you can switch off ignition and it will start first time and continue to start all day. vw dealer says no fault codes present. gloplugs renewed, new battery,fuel problem? Has anyone come accross similar problem I