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Hello try to identify what is the sensor with the red dot on the engine and it's purpose, it's related to what? The one to the right of the catalizer, just under the bloc heater.

This will be my first thread! if you wish to enlighten me. I am investigating because this sensor is leaking a bit of oil, a slow leak.

Thanks

 
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A picture would be very helpful.

My laptop doesn't want to show the picture but I see it on mobile. Looks like it's the oil pressure switch. In the below picture, the block is upside down.

 
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hey! this is it thanks! the oil pressure switch, looks pretty easy to replace too!