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After doing my clutch and gearbox I noticed a plug wasn't plugged in going into the coolant expansion tank, so I plugged it in and the light comes on, but it goes on and off whilst your driving. I drive home from work which is 15 minutes, it will go on for abit then it will suddenly go off.
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Is your coolant level low?
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So will I have to replace the expansion tank or? Where is the sensor
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Just replace the sensor. Its just a push and twist fit in the back (engine side) of the header tank. Or just unplug it again lol.
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Try taking it out and clean the scale off the two prongs, then it should work fine.
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With this light on an off, Ive got an MOT saturday and with my luck it will come on, will it fail the MOT?
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No it wont, you might get an advisory.