Ford Fiesta 2019 spanner light when cold

[Liam2024]

Hi 

new member here looking for help. 
 

I have ford fiesta 2019 1.0 eco boost titanium. Had since new and only 20000 miles on the clock. 
 

full dealer service history with next service due May 2025

Been a great car. 
 

spanner light came on and stayed on after a cold start this afternoon. Ran rough but then after stopping and restart light went off and ran like a dream again. 
 

starting from hot appears to be fine. 
 

without a fault code reader I’m suspecting there may be a faulty spark plug. I know they don’t get changed to 37.5k miles but I think they may be the originals. 
 

im on the fence just to change the spark plugs myself and hopefully the fault code archives and my suspicion is right or I get it diagnosed properly. 
 

Changing the spark plugs isn’t going to cost a lot and may be worth a punt anyway. 
 

I’ve read issues on brake pedal switches too. 

 

anyone else have an opinion. 

[StephenFord]

12 minutes ago, Liam2024 said:

anyone else have an opinion. 

Well, now you're just asking for trouble 🤣 plenty of opinion will be along shortly...

[TomsFocus]

The spark plugs should have been changed at the 4th year service if it's still on scheduled servicing at a dealership.

The fault codes need to be read to determine the cause of the warning light.

[Liam2024]

Thanks guys. 
 

I’ll need to pull my invoice to see if the spark plugs were changed at the 2nd service in May 2023 then. 
 

was done at a local Evans Halshaw so should be easy to find. 
 

could change my suspicions then. 
 

it doesn’t rule out a faulty spark plug but pushing me towards getting it on a fault code reader 

im not a fan of 2 year servicing to be honest having worked in the trade a while ago