'96/i30 obd codes from auto zone: help plz

[InfinitIly_fInnI]

P0150: air fuel ratio sensor 1 circuit- bank 2
P0304: #4 cylinder misfire detected
P1400: EGRC solenoid valve

i would really appreciate any suggestions, advice, and/or guidance provided. i am interested in D-I-Y troubleshoot/repairs if at all possible. thank you.
also can anyone please tell me the difference between bosch o2 sensor #13242 and #13228 other then the fact that #13228 is an alternate fit with longer wires and its $10 cheaper? would i be good with #13228?
is there any particular order in fixing these issues?
again any help is appreciated

[maxhopper]

P0150 is the code for the 02 sensor just below the exhaust manifold by the radiator.

P0304 check the spark plug and the coil on #4 cyl (middle cyl on the side nearest the radiator).

P1400 Read this: post5748042.html?hilit=p1400#p5748042

[InfinitIly_fInnI]

thanks 4 the help. do u know to seperate the boot from the plug?

[maxhopper]

Two small screws hold the coil pack in place. Unplug the electrical connector, remove the two screws, then twist and pull the coil up off the plug.