12 is batt or computer recently disconnected
It should be followed by a 55 that means the test is complete.
The PCM does not monitor fuel delivery , spark or start functions so your problem is probably fuel or spark..
Open the fuse box under the hood and find the fuel pump relay, then find another one like it and swap them.
Also try disconnecting the o2 sensor, this will eliminate it as a problem.
There are a lot of things that could cause the problem you are having. I'm not familiar with the security setup, maybe someone could tell you how to eliminate it as a problem.
Do you know the history or if the engine is internally sound?
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