The snap-on scanner and/or modis can get live data. I wish the code readers would give you all the same info as the one at the dealer... If it is adaptive mixture faults it was set at idle. If it is multiplicative faults, that's at higher RPMs while driving. The multiplicative rich mixture faults are usually the MAF sensor. The other thing about the dealers diagnostic software is it will tell you the multiplicative values and you can see after a couple miles if the values change for the better or not... hence, no guessing. (judging its a competent tech, not a newbie kid)

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2003 4.6is