Thermostat open circuit p0597

[l19ydm]

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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[rtd]

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

[l19ydm]

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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[Parkerdan]

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.

[gazzars4]

I’ve got the same fault come on this week


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[gazzars4]

That’s the codes stored with the EML on.


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[Tadass910]

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?

[gazzars4]

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


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[Tadass910]

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

[Royclarke]

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

[Tadass910]

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?

[Royclarke]

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

[Tadass910]

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:

[gazzars4]

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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[Tadass910]

Mine original battery 2014 year still kicking