No, it is not necessary. But unless your reset the check engine light you will not know you replaced the defective part.
you have to take to a rover dealer to put out the service light
put gas in it
put the key in the shifter
You put your seatbelt on.
if the service light has come on, you can reset this by pressing the odo trip meter reset button on the dash. that's the one you use to reset the trip counter to zero. put key in ignition and turn to position 2, press and hold reset button for 10 seconds. light will go out.
Put your key in the slot next to the light to reset it
There is a small black slot on the left of the guage cluster. Put your car key in there, it should reset the light!
If you look in the area of the light, under the speedometer, you'll see a small hole. Put your ignition key in there and turn it to reset the oil change light
just remove the battery cable for about 5min then put it back. that should reset the check engine light.
Because you did not have a faulty EGR valve. You misdiagnosed the problem. Start over and remember the code only tells you what part is being effected not necessarily the defective part. This is assuming you reset the light or drove the car enough cycles for the light to reset. If not then reset the light and see if it comes back on.
You can reset the air conditioning filter light by changing the air conditioning filter. If the light stays on remove the fuse for 10 seconds. Put the fuse back in and the light should stay off.