Blinking Check engine light?

[s14]

My s14 (5spd) feels like it runs perfectly but the CEL started blinking today while driving. The car didnt bog/stutter/lose power it felt fine. I shut the car off restarted it with no problems and the CEL stayed lit. I checked the codes and im getting code 34(knock sensor) code 77(rear o2 sensor) and code 103(park/neutral switch). I have done a search on the individual codes and how to fix them but I am wondering what a blinking CEL is all about?:confused:

also, is it possible that an o2 sensor malfunction would trip the other codes?

i hope this is going to be a cheap fix...

[racepar1]

A blinking CEL means that the computer has detected a fault that could seriously damage the engine. It is probably related to the knock sensor code. Either you have a bad knock sensor, damaged wiring, or the engine is actually knocking. For the O2 sensor code, just replace the O2. 99.9999999999999999% of the time that fixes O2 sensor codes. Judging by the P/N switch code I am lead to believe that you car may me converted. Make sure the neutral safety switch is wired up. The OBD2 computers look for that switch to cycle twice per drive cycle. If it is wired the switch is pretty much certainly bad. It is really common for the wires to break inside the little rubber boot.