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2006 Toyota Tundra 4.0L, this code comes on occasionally when truck is driven, but when I shut the truck off it goes away and won't come up when tested with OBDII tester , any Ideas , smog check place just tells me to drive couple of hundred miles and come back to re test smog , do you know if this will work , I've also been told to replace O2 sensor ?
Help please

Vehicle: 2006 Toyota Tundra 4.0L

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HI there

This code is for a processor error in the ECM, and it's really related to the O2 sensor. In most cases you will have to replace the ECM, however, check any fuses that supply power to the computer before doing that.

P0606 TOYOTA - ECM Processor Error
Read more: https://www.autocodes.com/p0606_toyota.html

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