Can some one indicate how to test the air temperature sensor located on the air intake. Can it be very critical to the idle of the engine if the sensor goes faulty.

I assume it is a resitor changing with Temp. What should be the right values versus temperature?

The car is 260E W124 1988 euro.

Thanks in advance

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Present cars:
My car: E-class 420CDI, 2008, W211, V8, 180 000km

Wife's one: C-class 220CDI Sport Coupé, Euro, 2002, W203. 345 000km

Son's one: GLK class, 220CDI, 2009, W204

Sold: E-class 260E, 1988, W124, Wonderfull car sold after 489 000 kilometres of reliable services (engine M103, clutch, brake system and 5 speed manual gear box all original).

Sold: E-class, 320CDI, W210, 2000, 225 000km