Gas Pedal Delay

WarmAndSCSI

Well, a primary O2 sensor being out of whack could cause your fuel trims to be pretty extreme. That would lead to kind of a "dead" feeling every time you crossed over from closed to open loop fuel operation.

But if it were that bad, your ECU would let you know about it (service engine light).

Secondary O2 sensors have no bearing on fueling or how the car runs. They are the "rear" two sensors downstream from the catalytic converters - one per bank.

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