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Look at the exhaust system from the (bank 2) left hand (driver's side in US) side of the engine. Sensor 1 is the sensor closest to the engine.

If you disconnect the electrical connector at the sensor, the two wires of the same color are used for the heater circuit. With ignition Key On use a voltmeter or multimeter to verify battery voltage (approx. 12V) across the wires on the harness side. If no voltage, suspect blown fuse, faulty PCM or damaged wiring.

On the sensor side (with connector still disconnected), use an ohmmeter or multimeter

to measure resistance across the two same-colored wires. Resistance should be greater than 0 but less than infinity. A reading of infinity is common for a bad sensor. A reading of zero is less common. Incorrect readings are also possible, but specific resistance depends on temperature of the sensor when measuring and you will need a service manual for more specifics.

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17y ago

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