Originally Posted by jfoj

I will RESTATE exactly what I said in Post #48.

Clearing the codes DOES NOT clear/reset the Fuel Trims.

Resetting/Clearing Adaptations clears or will zero Fuel Trims and standard/non Pro OBDII tools do not support Resetting/Clearing Adaptations.

Apparently some people DO NOT understand this.

I guess I will have to submit PROOF because the arrmchair mechanics DO NOT UNDERSTAND, HAVE NEVER EXPERIMENTED OR CHECKED ON THIS THEM FOR THEMSELVES.

@ upallnight, the you asked why the LTFT were 0 in the Log in post #34, I am not sure. I do not have all the details on how what happened right before the Log data was grabbed. But this may be the part of the problem that Rookie is having, something very unusual is going on with his vehicle that is NOT NORMAL and the data does not seem to fully account for what is going on.

I have yet to be able to get my head into the latest Logs, then I will have to go back and look all of them over. I review about 20 Logs a day so sometimes it is hard to keep them all separated in my head.

Fuel Trims/Adaptations are only zeroed when a tool is used that SPECIFICALLY has the ability to Clear/Reset adaptions. A generic OBDII tool does not have this capability and clearing codes WILL NOT clear/reset adaptations, it will erase Freeze Frame data, erase DTC's, erase Readiness Monitor Status and will start the Readiness Monitoring Status process over again.