Need some advice on 95 Max

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I have a 95 Max with 180+K miles on it. I have owned it since 1997 and have virtually no problems with the car. I recently was having some hesitation problems while driving so I thought of changing the spark plugs since it happened couple of years ago and I changed the plugs and it went away. The old plugs have about 45K on them so I thought I should change the plugs and see what happens. When I changed the plugs I found one of the ignition coils broken from the top where the boot is attached to the coil itself. I went ahead and got a new ignition coil from Nissan Dealership ($110) and replaced that as well. After changing the plugs and the coil the hesitations persisted and sometimes the car would stall as well. The idle was fine it just hesitated on low speeds and especially when fully warm. By the way I have CEL on for a while but I have been ignoring it since its was not giving me any problems. I looked online and found that I can check CEL codes myself so I pulled the codes and it gave me MAF (MASS AIR FLOW SENSOR) and KS (KNOCK SENSOR) malfunction. I also found in online forums that KS is a ghost code and usually accompanies some other codes. I changed the MAF (EBAY $65) and now the car is running fine no knocking or hesitations. I reset the CEL after changing the MAF.

The CEL is lighted again and now its giving me following 3 codes - 0304 (KS)0503 (Front O2 Sensor Right side)1005 (EGRC Solenoid valve)

I need some advice that should I just change the O2 sensor and see what happens? the other codes like KS are ghost or should I need to change the KS as well. Seems like the KS is not an easy job even though some people have done it without taking out the upper manifolds.

Also I need to know if its easy enough to change the O2 sensor myself any visuals or video links would be great.

[jltibbs]

Welcome to NICO!

if you can catch a break on the knock sensor, i would change it. i know we sell them at advance auto parts for about $150. when i had mine, i found one for $50, changed it out and never had the light again. be advised, i had o2 sensor codes as well. i changed them at the same time.

does the 'front right' o2 sensor you are referring to happen to be 'bank 1 sensor 1'? if so, it's kind of a PITA without a lift. reason being is, bank one is towards the firewall.

i believe that the EGR code might have something to do with the canister purge solenoid, and i think that the solenoid and canister have to be changed together, but not sure. maybe someone else has some more knowledge on that subject.