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The OBD code P0147 for a Pontiac Firebird indicates an issue with the oxygen sensor circuit, specifically related to the sensor located after the catalytic converter (bank 1 sensor 3). This code typically points to a malfunctioning oxygen sensor, wiring issues, or problems with the engine control module (ECM). It's important to diagnose the specific cause, as it can affect fuel efficiency and emissions. Checking the sensor connections and replacing the sensor if necessary are common steps for resolution.

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