Ford S-max starting issue (hard starting/no start), no fault codes present, glow plug fault.

In this video we are looking at an intermittent hard starting Ford S-max mainly on cold mornings.
With a quick code scan we find no faults codes present and the car starts first time when its in the workshop.
1.So does this mean our testing is done?
2.Is the customer not telling the truth?
3.Can we use just a few more basic checks to test known systems that cause intermittent no start or hard starting issues?
Or
4.Should we just hand the vehicle back to the customer because the code scanner say there's no codes stored and the vehicle started.
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[@iankelly2110]

Good diagnosis. Just a tip if you disconect the temperature sensor it will go to -40 and the ecu will command the glow plugs on for longer just for testing purposes.

[@jasbirsjngh-id6gy]

Hi my brother has just bought a 2010 Ford Galaxy 2.0d has similar cold start problems was told that glow plugs have been replaced still has been very difficult to start in cold did find a second hand glow plug relay in car door pocket. Have looked virtually everywhere to find glow plug relay could not find please can you help

[@sonnyd198]

So much fannying about