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I would not do this mod! as it will effect one part of the afm's operation and stuff up the other! This is all related to open and closed loop operation of the o2 sensor! If u lean out the system in wide open throttle mode (yeah it sounds like a good idea) when it goes back to operating in closed loop the ecu will notice the afm is running out of its pre-programed operation level (this should take about 5 min of operation) cuasing the check engine light to light up and the afm to log a code in the ecu. This is alll part of the air/fuel correction program thats constantly running while in closed loop operation, older ecu's dont apply.
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