Can anyone help with some advice about working on my car myself. My check engine light came on and took it to the mechanic to check the codes. They read P0300 throguh P0303. He says two of the ignition coil are malfunctioning. he recomende to replace all three and all of the spark plugs. Is it as easy as replacing the coils and spark plugs. Is that something that I can do myself? I looked at the coils and all it is to replace is removing a brace and disconecting it. Does aybody know why the ignition coils ge damaged? Can anybody vewrify that the codes have been properly interpreted by my mechanic.