the o2 sensor is located in the exhaust system, protuding from the catalytic converter. to replace the sensor u need a sensor socket of the rite size (they usually all only come in one size). Its a socket with a slot cut out of it for the wires to fit by when loosening the sensor. Its prolly easier to remove the whole exhaust system out since its only held by elastic bands, but u can do it with it attached as well. Loosen sensor with sensor socket, remove and replace. Oh and one more thing, remember to do this when the car hasn't been started for at least an hour or two otherwise that exhaust will scold u bad.
it's on the radiator, just pull the wires and unscrew it.
how do adjust timing belt on a volvo 240 DL ?
how do you reset engine light on 1991 volvo 240
It can be a little expensive to replace the EGR valve on the 1987 Volvo 240 DL. The job takes about 1 to 3 hours and can cost as much as about 240 dollars.
Pull on them. They are held on with spring clips.