Code 3
2011 Vauxhall Insignia 1.8 petrol

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Matthew
Driver
4 points

Problem added: Jun 19, 2021 (2 months ago)
I have a code 3 on my car it pops up after 20 mins in from driving. I have just had the water pump changed there is no leak but still getting code. The coolant doesn't seem to return to expansion tank all the time. Thinking maybe sticky thermostat any help would be much appreciated. Feel like im going round in circles.
Car: Vauxhall Insignia
Variant: 1.8 petrol
Model Year: 2011
Replies and Fixes
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whittingehame
Legend
21,029 points

Jun 19, 2021 (2 months ago)
Could try bleeding the cooling system though USUALLY not needed .
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Matthew
Driver
4 points

Jun 19, 2021 (2 months ago)
Thank you. I will try that only bought it 2 weeks ago. If this doesn't work could it be the thermostat or sensor do you think? Many thanks for your help.
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whittingehame
Legend
21,029 points

Jun 19, 2021 (2 months ago)
It may be a sticking thermostat as suggested . You could also check that the engine cooling fan is coming on o.k and that the cooling system is not over pressurising .
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Matthew
Driver
4 points

Jun 19, 2021 (2 months ago)
Thank you will check that tomorrow. If thats ok i may go back to the garage i just hope it is nothing to do with the gasket :( Thanks very much for your help. Hopefully i can get this sorted.
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whittingehame
Legend
21,029 points

Jun 19, 2021 (2 months ago)
A other possible cause could be the cyl head gasket .This can be verified / eliminated by carrying out a block test .
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Matthew
Driver
4 points

Jun 19, 2021 (2 months ago)
Thank you are block test expensive?
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whittingehame
Legend
21,029 points

Jun 19, 2021 (2 months ago)
Not really , we had a workshop kit but they can be bought from motor factors or accessory shops , E bay and Amazon i.e

https://www.ebay.co.uk/itm/181059430832

https://www.amazon.co.uk/Block-Tester-Bt-500-Combustion-Leak/dp/B06VVBSFTF
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Parts mentioned on this page
Water Pump
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Thermostat
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Head Gasket
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