Quote:
Closed loop: ECU monitors exhaust gasses and alters injector pulses to meet the engines needs.
Open loop: ECU uses best guess and ignores input from the exhaust gas oxygen sensor.
Closed loop only works when the exhaust is up to temp but switches to open loop with WOT (wide open throttle) conditions.
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That much I know but surely there's a "Oh-sh*t-Im-running-too-lean/rich" safety measure ?