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What is code p0144 mean in a 97 Chevy blazer 6-cylinder?

P0144 - Oxygen (A/F) Sensor No Activity detected (Bank 1 Sensor 1)

Possible causes for OBD Trouble Code P0144

* Faulty oxygen sensor Bank 1 sensor 1

* Wiring and/or connector issues associated with sensor 1, bank 1

* Leaked exhaust

* Leaked vacuum

* Faulty engine coolant temperature (ECT) sensor

* Bad fuel pressure regulator.

* Problems in the air management sensor, such as loose vacuum.

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