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ECU is self-adjusting and constantly learning. Under normal operation it learning mode slowed down, it’s pretty much in troubleshooting mode. In case of high performance header installation; ECU used to see one amount of exhaust gasses flow, but once header was installed flow of exhaust gas was increased dramatically, and ECU gives warning (engine check light) because it sees it like trouble.
As said before ECU is self adjusting and constantly learning, so it will readjust itself, but you have to drive something like 400-500ml before it readjust it self.
By resetting ECU you're forcing ECU to go into learning mode, it will take 15-20ml of normal driving for ECU learn/adjust to new conditions.
you should reset your ECU every time you install high performance parts like exhaust, intake, ignition system modifications.
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Power: Denso IK22 spark plugs, OBX Headers, J32A2 Camshafts, CT SC w/HB
Electronics: Apexi VAFC (untunned)
Gear Box: Rebuilt at 53K ml & at 63K ml by Aamco and still
Suspension: Eibach Sportlines, Koni Sport, Comptech Sway Bars & Neuspeed upper strut bar.
Wheels: 17x7 OZ Racing Superleggara & 215/50 Dunlop Sport A2
Brakes: Legend GS 2 Piston Calipers, Goodridge SS Lines, Endless Nova Pads
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