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Haven't heard of a barometric sensor on this car, but I'm aware of a temperature sensor for the onboard computer mounted in the front lower center of the airdam.
As to the intermittent CE light, I would suspect an emissions related problem as this caution light is design primarily to monitor the integrity of the emissions control system. Secondary causes tend to be fuel-system related.
Things to check are air pump operation, EGR system, flame trap/crankcase ventilation and the fuel system.
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(98 S70 T5SE misc mods, mostly lighting) (92 940GLE)
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