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P2273 is a diagnostic trouble code (DTC) for "O2 Sensor Signal Stuck Rich Bank 2 Sensor 2". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $154.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $50.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
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The P2273 diagnostic trouble code is an indication that the Bank 2 Sensor 2 oxygen (O2) sensor signal is stuck on rich.
Related Trouble Codes:
The purpose of the oxygen (O2) sensor is to monitor the amount of oxygen that is present in the exhaust. The air-fuel ratio is very important. Too much fuel will allow carbon monoxide to be emitted into the atmosphere. Too much oxygen will allow hydrocarbons and nitrogen oxides to be emitted into the atmosphere. The oxygen sensor will send information regarding the air-fuel ratio to the powertrain control module through a voltage signal. If the voltage signal indicates that the air-fuel ratio does not fall within the predetermined range that has been set by the manufacturer, the P2273 diagnostic trouble code will be stored by the powertrain control module (PCM) and the Check Engine Light will come on.
Diagnostic trouble codes should be diagnosed in the order that they appear in the powertrain control module (PCM)
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
Inspecting oxygen (O2) sensor wiring for breaks, shorts, frays, disconnections, and corrosion
Repairing or replacing oxygen (O2) sensor wiring that is damaged
Inspecting oxygen sensor (O2) sensor connectors for loose connections, damage, and corrosion
Using the OBD-II scanner to clear all diagnostic trouble codes and completing a test drive to see if the P2273 code comes back.
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.
This voltage reading should show a constant variation between 100 millivolts and 900 millivolts.
Observes the voltage signal of the downstream oxygen (O2) sensor, located behind the catalytic converter.
This voltage reading should show a slow variation between 100 millivolts and 200 millivolts.
If the oxygen (O2) sensor voltage readings coincide with the above specifications, inspecting the engine vacuum lines for leaks. Repairing engine vacuum leaks as necessary.
Using the OBD-II scanner to clear all diagnostic trouble codes and completing a test drive to see if the P2273 code comes back.
If the P2273 trouble code does come back, inspecting the exhaust for leaks and repairing the exhaust leaks as necessary.
Using the OBD-II scanner to clear all diagnostic trouble codes and completing a test drive to see if the P2273 code comes back.
If the P2273 trouble code does come back, inspecting the intake manifold for leaks. Repairing leaks as necessary.
The oxygen (O2) sensor may be faulty and need to be replaced if the voltage readings do not coincide with the above specifications.
Using the OBD-II scanner to clear all diagnostic trouble codes and completing a test drive to see if the P2273 code comes back.
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. This is rare.
Often, the mistake is made of replacing the wrong oxygen (O2) sensor. This particular code refers to the Bank 2 Sensor 2 oxygen (O2) sensor. A common mistake that is made when diagnosing this code is overlooking faulty wiring and/or connectors or neglecting to inspect for vacuum leaks.
A diagnostic trouble code is normally considered serious when it causes drivability issues or a change in performance. The P2273 diagnostic trouble code is not known to cause drivability issues or a change in vehicle performance. For this reason, this trouble code is not considered serious. However, the car will burn more gas and emit more pollutants so it should be addressed as soon as possible.
Repairing or replacing oxygen (O2) sensor wires that are broken, shorted, frayed, disconnected, or corroded
Repairing or replacing oxygen (O2) sensor connectors that are disconnected, damaged, or corroded
Replacing oxygen (O2) sensor fuse, if necessary
Locating and repairing engine vacuum leaks
Locating and repairing exhaust leaks
Locating and repairing intake manifold leaks
To repair incorrect fuel pressure, the fuel pump, fuel pressure sensor, or fuel pressure regulator may need to be replaced
Replace and reprogram powertrain control module (PCM)
One of the most important things to remember is that vacuum leaks have been known to cause the P2273 diagnostic trouble code. Before making a determination that the oxygen (O2) sensor needs to be replaced, inspect the vacuum hoses and connections to make sure they are properly installed and that there are no vacuum leaks. Vacuum leaks are less expensive to fix than oxygen (O2) sensors and depending on the make and model of the vehicle replacing an oxygen (O2) sensor can be costly.
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