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| Silver 1998 Audi A4 1.8 Front Angle View |
Is it true that my ECU needs to be flashed if my battery has been disconnected on my 98′ Audi A4 1.8? Are there any other problems that might occur?
Answer: No. The only
“problems” you may experience are resetting radio presets, clock date
& time, etc. The car may run a little rough at first but should be
fine. The vital ECM programing, fuel and ignition maps, etc. are written in permanent (non-volatile) memory, they will not
be lost without power. What you will lose is what is called volatile
memory. These are mostly learned parameters. The ECM “learns” how the
engine is running and how the owner drives. Fuel Trims and other
parameters that the car changes to compensate for wear, will be lost.
After driving the car, The ECM will “relearn” these things. You may not
even notice any of these things taking place. You should be fine.
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