The Check Engine light has nothing to do with changing the oil. The light is on because there is a problem with the emissions system. Even if you reset the light it will just come back on unless the problem causing it to come on is repaired. You will need to have the ECU scanned with an OBD2 scan tool. That tool will retrieve the code that has been set by the ECU. The code will tell you what part is being effected, but not necessarily what part or parts are defective. To determine that takes training, experience, and diagnostic skills. I suggest you seek professional help. If the engine is running fine there is no hurry but if it is not running as it should, then do not put this off.
If the engine light has come after the oil change then it would probably the oil dipstick not fitted in properly. engine light is closely related to air leakage and if dip stick is not fitted properly small amount of air can enter causing the engine light to lit.only way to erase the light is to take to a dealer or unplug ECM connecter for few seconds so it erase the faults itself.
The radio code is not written in the owner's manual. It is written on a small card that came with the car. If you cannot find the # anywhere then contact your local Volvo dealer. They can get you the # which is specific to your car and your radio.
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The radio panel for 2005 volvo s40 2.4i is dark even with the radio on. You can see what is happening on the panel. Just 2 vertical lines show up.
How do I obtain the code for the radio, manual was not with car when I bought it 2nd hand
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