Error codes

[Bark]

Morning all,

I have done quite a bit of work getting my used 95 explorer to as best as possible condition. I am pretty close to done. These are the final codes I have. I have replaced the EGR, DPFE, and the rubber hoses. I think I might need to clean out the pipe from the EGR to the manifold, the hoses were almost completely blocked. I have 2 new o2 sensors coming on Friday. 95 explorer xlt 2wd obd1

327 o
539 o
172 c
327 c
332 c
336 c
337 c

I did a seafoam treatment and I did notice a leak from the double nuts that go from the egr tube to the manifold.

When o2 sensors go bad do they tend to go bad rich or lean or is it 50/50? Also last time I ran codes I got bothh o2 sensors were bad. Any good reason for it not to read this time?

Thanks alot in advance for the help. Also I can shoot pictures of the o2 sensors and do a write up if it is helpful.

 

[Bark]

Also, I sucked on top of the egr and the car stalled out.