Starting in '02 ('02-1/2?) they made the O2 sensor see the EGR cycle difference. If it is outside the factory parameters during the EGR cycle - the light comes on and stays on. One of the tuner guys has a program he'll add to a performance tune for $80. It only runs the EGR cycle until the coolant temp gets to 150. Since the heater hose runs from the engine through the EGR cooler to the heater core, theory is that the EGR will help build heat when it's cold out.
I want to keep the tune stock so I'll see if I can get just the EGR tune, the perf tune is $250 and the EGR tune is an addition.
I want to keep the tune stock so I'll see if I can get just the EGR tune, the perf tune is $250 and the EGR tune is an addition.