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1999 1.8 Engine breather hose - jp147
I would appreciate it if someone could answer this question I have.

I have just had the rocker cover gasket replaced on my ford focus 1.8 petrol.

Before I left the garage I looked underneath the bonnet and noticed that the technician had forgotten to connect the breather hose back onto the engine.

What damage, if any, could occur by driving without this hose connected up and would it depend on how long you drove it for ?
1999 1.8 Engine breather hose - Screwloose

It might make it run marginally lean; but not really a serious issue.