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How many oxygen sensors does a 1991 Honda Accord DX have?

The 1991 Honda Accord DX has two oxygen sensors. One is located upstream of the catalytic converter, and the other is located downstream of the catalytic converter. The upstream oxygen sensor measures the amount of oxygen in the exhaust gas before it enters the catalytic converter, and the downstream oxygen sensor measures the amount of oxygen in the exhaust gas after it exits the catalytic converter. This information is used by the engine control unit (ECU) to adjust the air-fuel mixture to ensure that the engine is running efficiently.
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