thanks but would this be responsible, if broken, for the constant rich running, and if so, how do i test it to check it?

also, since the car has been standing for at least two years, is it possible that the sensor is 'dormant'? in other words, is it possible to fix the sensor if it isn't working. i mean if it has working parts inside it, then perhaps a gentle tap would help, or a clean with something etc etc

thanks

jb

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W123 200T 1982
Porsche 911 sc 1982
Honda C90 Cub 1995