Check glow plugs message on radio

Hi all. We have a 2018 1.6d Ltd. Its done 65,000 miles. Check glow plug light comes on and we get a warning on the radio. Code reader shows nothing. The error goes away after 30 seconds. It doesn't smoke, Seems to start straight away.
I have measured the resistance of the glowplugs. 3 off them are 0.8 -0.9 ohms the last one is 95.5 ohms. I'm guessing its the 95 ohms one 2hich would draw no current at that to heat up. Any experience with similar and am I along the right path? How easy do they come out?

Cheers guys