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how could you tell - via the narrow band o2 signal to the ecu, or aftermarket wideband? if aftermarket, was the sensor placed before or after the cats? if using the afr from the ecu, did the ecu not correct the lean condition? also, at what rpm were you seeing a lean condition - part throttle, wot, or both?
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Porsche Boxster S
Porsche Boxster
Hybrid Mode
