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Hi All,

I have been having some issues with stop/start system not functioning and emissions light coming on. Had it diagnosed as above however the quote to replace the thermostat is for 6-7 hours work plus parts.

Has anyone undertaken this task or seen a how to writeup?

Many thanks


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This is interesting reading what issues are you having with the start/stop?

rtd wrote:This is interesting reading what issues are you having with the start/stop?

Message on dash that start stop function not available. I believe the emissions light comes on due to mixture, every time the light is on there are circa 100 of the above faults and 1 mixture fault on lambda probe.

Thermostat are normally a very simple Swap but without engine diagrams etc I am reluctant to tackle it.



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l19ydm wrote: ↑

Tue Jan 02, 2018 8:45 pm

rtd wrote:This is interesting reading what issues are you having with the start/stop?

Message on dash that start stop function not available. I believe the emissions light comes on due to mixture, every time the light is on there are circa 100 of the above faults and 1 mixture fault on lambda probe.

Thermostat are normally a very simple Swap but without engine diagrams etc I am reluctant to tackle it.



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Hi, did you have any luck with this after? I have same issue.

I’ve got the same fault come on this week


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That’s the codes stored with the EML on.


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gazzars4 wrote: ↑

Sat May 30, 2020 2:37 pm

I’ve got the same fault come on this week


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I bet you car is facelift and you have 40.000 miles and such problems occur on your car, interesting, maybe you car is tuned?

Yes face lift and MRC tuned needing sorting might drop MRC a email see if they can sort the issue.


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gazzars4 wrote: ↑

Sat May 30, 2020 7:30 pm

Yes face lift and MRC tuned needing sorting might drop MRC a email see if they can sort the issue.


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Could be tune related who knows

Mines stock and 42000 miles and had the start/stop fault and logged a coolant fault,they gone now now that I drive it everyday,I read somewhere with everything on these cars the batterie can start to drain and throw some faults,also when it goes into 4 cylinder mode the alternator can shut it’s self off because it uses more fuel to run it all the time

Royclarke wrote: ↑

Tue Jun 02, 2020 1:39 pm

Mines stock and 42000 miles and had the start/stop fault and logged a coolant fault,they gone now now that I drive it everyday,I read somewhere with everything on these cars the batterie can start to drain and throw some faults,also when it goes into 4 cylinder mode the alternator can shut it’s self off because it uses more fuel to run it all the time

So what causing a problem then?

Well for my car I’m guessing it was the batterie was draining and throwing so codes,I also read of this same thing happening on someone else’s car to

Royclarke wrote: ↑

Tue Jun 02, 2020 4:16 pm

Well for my car I’m guessing it was the batterie was draining and throwing so codes,I also read of this same thing happening on someone else’s car to

If i understand correct when batteries coming to an end you should receive a yellow light like this:

Mine is the original battery still,looking back on invoices a new battery was quoted last year but wasn’t fitted. I’m going to get mine tested see if that is the cause interesting.


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Mine original battery 2014 year still kicking