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Trying to understand disappearing logged fault codes!

Some time ago, maybe in July, I posted somewhere within briskoda that after scanning wife's August 2015 Polo I had a "590081 - Control Circuit for A/C Compressor B10A9 11 [008] - Short to Ground   Intermittent - Confirmed - Tested Since Memory Clear ----"  then without me requesting that VCDS cleared these faults, the next time I scanned that car, probably weeks later, that logged fault code had vanished, at that time I was given answer which I probably did not fully understand, James@RRGRochdale , so sorry!

Then in September, I scanned that car and found I had a "5688 - Control Head for Multimedia System  B13C9 F2 [008] - On/Off Switch  Intermittent - Confirmed - Tested Since Memory Clear ----" then without me requesting VCDS cleared these faults, the next time I scanned that car, that logged fault had vanished.

 

So what is happening, is this VCDS making a decision about this and clearing these faults or is it the onboard controllers dismissing these faults after some time has passed and they do not re-appear?

 

It is just that I can't really understand the phrase "Intermittent - Confirmed - Tested Since Memory Clear"  - well at least the "Tested Since Memory Clear" bit is what I do not understand fully.


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