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Yes, a 1989 Volvo 740 can run without an O2 sensor, but it may not perform optimally. The absence of the O2 sensor can lead to increased fuel consumption and higher emissions, as the engine management system relies on it to adjust the air-fuel mixture. Additionally, you may experience rough idling or decreased engine performance. It's advisable to replace or fix the sensor for better efficiency and compliance with emission regulations.

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1mo ago

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