All 4 plugs are ok i verify them and the sender unit of glow plugs have just been replace.i still have this error.

motomete2004 said:

All 4 plugs are ok i verify them and the sender unit of glow plugs have just been replace.i still have this error.
https://m.youtube.com/watch?v=mEIJmHgUVE8

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I get that.. no idea - it still starts fine,
Charlie 105 JTD

Are there any fault codes.?
Maybe the fault code just needs clearing now you have replaced the components.?
Un-plug the glow plugs and check the ohms resistance of each glow plug. You don't need to remove them to check the ohms resistance.

Thefox said:

Are there any fault codes.?

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glow plug circuit.. nothing to pinpoint where to spend time and money..

Accroding to the repair manual it is post-heating and shall be normal.