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Will a bad oxygen sensors turn the engine light on 2004 olds alero?

Yes, a bad oxygen sensor in a 2004 Oldsmobile Alero will almost certainly trigger the check engine light (CEL). The oxygen sensor is a crucial component in the engine's emissions system, and the onboard diagnostics (OBD-II) system constantly monitors its readings. If the sensor is malfunctioning, the computer will detect this and illuminate the CEL.
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