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No make, model, or year shown, but on many pre-OBDII models (before 1995), the code 55 (or five blinks, five blinks) meant NO trouble codes. It was a method to let you know your request was received, but it had nothing to report.
If you had two blinking CEL codes, a 12 (pause) and a 55, the code 12 means the battery has been disconnected within the previous 50 starts. The code 55 indicates the end of stored codes. Therefore, you have no saved trouble codes (disconnecting the battery deletes saved trouble codes).
When activated obd code will be listed by number and after all codes have been displayed code 55 will be displayed letting you know there are no more codes,
Well those are codes, but not trouble codes. Code 12 is the start and also means there are no codes since the battery was disconnected, and 55 is the end of the test.
Well, the code 12 is telling you the battery or the computer has been disconnected in the last 50 starts, code 21 is a problem with the O2 sensor, and code 55 is telling you there are no more trouble codes stored in memory. Code 21 means the O2 sensor is not switching from rich to lean, which can be a faulty sensor or a fuel problem.
ok code 12 means that you disconect battery recently, maybe you were trying to clear trouble code by doing that, in worst case just replace the battery not a big deal
Code 55 means "no Trouble codes found" code 55 means that thats the end of self testing codes, there is no mode code. just ignore code 55.
im pretty sure you were doing a selft testing dtc bye turning switch on and off.
Trouble code 55 really isn't a trouble code at all. It indicates the END of the trouble codes. If that is all you are getting, then there are no codes stored.
Easiest way to reset the PCM is to pull the possitive battery cable for 30 seconds to a minute. Of course, you loose your radio presets and whatnot. If you prefer, just pull the fuse for the PCM out of the fusebox for the same length of time and replace. I don't know the exact one, but there should be a diagram on the fuse box door, or nearby the fuse box.
code 55 is the "end" code showing that the diagnostics have been completed. If you had no other codes, then there is nothing stored as a fault in the computer.
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