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P2270 is a diagnostic trouble code (DTC) for "O2 Sensor Signal Stuck Lean Bank 1 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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
O2 Sensor Signal Stuck Lean Bank 1 Sensor 2
P2270 is an OBD-II generic code for the O2 sensor signal stuck lean on bank 1 sensor 2 to the engine control module (ECM). This means that the O2 sensor in bank 1 sensor 2 indicates either too much oxygen in the exhaust stream, an open circuit, or a defective sensor which causes a lean signal to the ECM.
The engine control module (ECM) got a lean voltage signal return from the bank 1 sensor 2 oxygen sensor.
The ECM attempts to correct the output by going rich while monitoring the signal, sets code, and turns on the Check Engine Light if the output stays lean.
The wiring or connection to the sensor is damaged causing the lean output.
The Check Engine Light will be illuminated and the code is set in ECM memory as a fault.
The engine fault may be the P2270 and also catalyst codes may be set.
Scans and documents the code in the ECM
Diagnoses the code, as per the manufacturer's pinpoint test, to verify the O2 sensor signal
Disconnects and tests the O2 sensor for proper output voltage as specified
Clearing ECM memory codes before checking the freeze frame data of the failure
Failing to clear ECM codes after the P2270 codes are fixed
Replacing the O2 sensor before any exhaust leaks are repaired.
Code P2270 is an indication that the O2 sensor does not detect the catalyst efficiency and can cause the vehicle to fail an emission test.
Code P2270 can be generated by a vehicle that has an exhaust leak between the first and second O2 sensors. The added O2 entering the exhaust will give erroneous signals from the sensor that is downstream from the leak.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.