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Q: Just bought a 1990 240 DL sedan and I'm not impressed with the gas mileage. on 1990 Volvo 240

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Have read it may be the o2 sensor. Does anyone know how much that might cost to have looked at? or any other suggestions?
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possibly $100 to hook up a scope to your o2 sensor and verify operation...or just buy and replace it for $150 or so.
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