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Well glow plugs and there harness go bad on EVERY tdi after 50k miles.
ALso the relay sometimes goes bad. If you have a 5 speed there is a glow plug trio on the right side of the engine. Those are used 2 heat the coolant to bring the temp of the engine up faster because there is no coolant going through a transmission (AT cars). Check the glow plugs on the trio next to the valve cover and those harnesses. If you see any copper color on the harness you need to replace the harness.
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