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When you do a cylinder leak down test you need to find out where the air is leaking from. as air is going in listen at the tail pipe, the intake the and the oil cap. out the the tail pipe you have a bent exhaust valve, out the intake you bent the intake valves, out the oil cap you need new rings. You need to have that cylinder on top dead center of compression stroke. Hope this helps you
12 is a battery disconnect within the last 50 start cycles and 55 means the end of the diagnostic cycle. Basically the computer found nothing wrong. The 12 code may seem incorrect if you haven't disconnected the battery recently, but from my experience the 12 code shows up almost all the time regardless.
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