Stop warning light

Hello to All,

On two occasions now whilst driving the STOP warning light has come on, beeped and then disappeared as quick as it came on.

Today a friend ran a diagnostics test with the following result

DF025 - Preheating unit diagnostic connection
- Present
- Open Circuit.

Does anyone know what this means? He seems to think it could be my glow plugs as the car needs a little longer to start up these days.

Thanks

Saul.

Forgot to mention that it is a 2007 Scenic II 1.5DCI with approx 78,000 on the clock.

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Stop warning light