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Just wondering how long codes are stored for in the PCM. Even though the check engine light is not on, how long will codes be able to be pulled up from the obd II port when i go for inspection?
 

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If they are the type of codes that reset themselves after so many "key cycles" thereby extinguishing the CEL then they'll still be in there but if someone hooks up a scanner and erases them, they're gone.
 

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or disconnect the neg. batt cable for 5 min.
 

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They are definitely not in there forever. There is some limit to the memory in the PCM but I have no idea what it is. It's probably not that much though. Probably it's a FIFO buffer that would hold some reasonable number of codes for troubleshooting, maybe 8 or 16?
 
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