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Q: o2 sensors code, how to test and replace on 1992 Dodge Ram Van B350

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locate and replace o2 sensors
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The oxygen sensor is threaded into the left exhaust manifold above the manifold outlet. The connector mounts to clip on the left motor mount bracket.. In order to test the sensor you usually need a scanner or digital oscilliscope. Are you getting a check engine light, or just reduced gas mileage?
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