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My glow plug light has started to flash when ime driveing?

My glow plug light started to flash today when I was driveing , the van still seems ok , do I need new glow plugs ?
Robert caldwell, February 2015
cdc is right. See this post for examples of what could be wrong.

http://www.rac.co.uk/forum/showthread.php?17636-VW-Polo-Glow-Plug-Light

You can waste your money guessing.

ChicksFan, February 2015
would get it onto a code reader

cdc, February 2015