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What does VCM code fuel 44 fail mean on 1993 jaguar xj6?

P0144 - O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 1)

This code means the oxygen sensor in bank 1, sensor 1 is not sending a signal to the engine control module (ECM). This could be due to a faulty oxygen sensor, a wiring issue, or a problem with the ECM itself.