If the P2273 diagnostic trouble code does come back, there is a possibility that the powertrain control module (PCM) is faulty and needs to be repaired and reprogrammed. The oxygen (O2) sensor may be faulty and need to be replaced if the voltage readings do not coincide with the above specifications. If the P2273 trouble code does come back, inspecting the intake manifold for leaks. If the P2273 trouble code does come back, inspecting the exhaust for leaks and repairing the exhaust leaks as necessary. Repairing engine vacuum leaks as necessary. If the oxygen (O2) sensor voltage readings coincide with the above specifications, inspecting the engine vacuum lines for leaks. This voltage reading should show a slow variation between 100 millivolts and 200 millivolts. Observes the voltage signal of the downstream oxygen (O2) sensor, located behind the catalytic converter. This voltage reading should show a constant variation between 100 millivolts and 900 millivolts. If the P2273 trouble code does come back, use a scanner to observe the voltage signal of the upstream oxygen (O2) sensor located in front of the catalytic converter. Using the OBD-II scanner to clear all diagnostic trouble codes and completing a test drive to see if the P2273 code comes back. Inspecting oxygen sensor (O2) sensor connectors for loose connections, damage, and corrosion Repairing or replacing oxygen (O2) sensor wiring that is damaged Inspecting oxygen (O2) sensor wiring for breaks, shorts, frays, disconnections, and corrosion Using an OBD-II scanner to collect all trouble codes that have been stored by the powertrain control module (PCM) as well as freeze frame data How does a mechanic diagnose the P2273 code?ĭiagnostic trouble codes should be diagnosed in the order that they appear in the powertrain control module (PCM)
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