Instead of jumping from A to B just replace the sensor.
It is only a few quid if you replace it yourself and not much more expensive if a garage does it as it only takes a few minutes.
Back in the old days with a problem like that we would have the part in the boot, at around 2am when it went quiet and we were all round the market getting dinner we would call the AA or RAC because of this "light"
When the AA/RAC bloke turned up to have a look mention that it happened before and the mechanic bought this sensor but then it went off again so you didn't have it fitted.
Then offer Mr AA/RAC a drink to fit it for you.
The other advantage is that AA and RAC patrols carry some very good diagnostics kit. Some better than others though.
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