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So, I just replaced the inverter on my '01 Prius. A friend of mine was saying I need to reprogram the hybrid ECU after inverter replacement, but I don't see that anywhere in ALLDATA. I'm still getting P3125 after replacement. MG1 and MG2 seem to test OK. Thanks!
 

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While the replacement was going on, was the 12 V battery completely disconnected ??

If not, try that for an hour or so.

IF.....you still get the P3125 code after that.....it probably means that the inverter wasn't the problem to start with.

Or the new one is bad too.
Or you did something wrong.
 
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