<ul> <li><b>Engine Light ON (or Service Engine Soon Warning Light)</b>: <b>Engine Light ON</b> indicates a problem with the O2 Sensor Reference Voltage Circuit High on Bank 2 Sensor 1. This can be caused by a faulty O2 sensor, damaged wiring, or a malfunctioning Engine Control Module (ECM).</li> <li><b>Poor Fuel Economy</b>: <b>Poor Fuel Economy</b> may occur due to incorrect air-fuel mixture readings caused by the faulty O2 sensor, leading to inefficient combustion.</li> <li><b>Rough Idle</b>: <b>Rough Idle</b> can be a symptom as the engine may struggle to maintain a stable idle speed due to incorrect oxygen sensor readings.</li> <li><b>Increased Emissions</b>: <b>Increased Emissions</b> may result from improper air-fuel mixture regulation, leading to higher levels of pollutants being emitted from the exhaust.</li> </ul>

<ul><li>The front oxygen sensor on Bank 2 may be faulty, leading to incorrect voltage readings.</li><li>An open or shorted harness in the front oxygen sensor Bank 2 can disrupt the reference voltage circuit.</li><li>Poor electrical connections in the front oxygen sensor Bank 2 circuit can cause high voltage issues.</li></ul>

<ul> <li><b>Retrieve Codes and Freeze Frame Data</b>: Connect the diagnostic scanner to the vehicle's diagnostic port. Retrieve all stored codes and pertinent freeze frame data. Write down this information for reference.</li> <li><b>Clear Codes and Test Drive</b>: Clear the codes and test drive the vehicle until the code is restored or the PCM enters readiness mode. If the code is intermittent, the condition may need to worsen for accurate diagnosis.</li> <li><b>Perform Visual Inspection</b>: Inspect related wiring and connectors for damage. Repair or replace any wiring that is cut, burned, or damaged.</li> <li><b>Test O2 Sensor Voltage</b>: Use a DVOM to test the O2 sensor voltage at the appropriate connector pin near the sensor. If no voltage is detected, check system fuses and replace any blown or defective fuses.</li> <li><b>Check PCM Connector Voltage</b>: Test the corresponding circuit at the PCM connector. If no voltage is detected, suspect an open circuit between the sensor and the PCM. If voltage is present, suspect a defective PCM or PCM programming error.</li> <li><b>Test O2 Sensors</b>: Start the engine and allow it to reach normal operating temperature. Observe oxygen sensor input data on the scanner. Pre-cat sensors should cycle between 1 and 900 millivolts. Post-cat sensors should also cycle but remain relatively stable. Replace any sensors that fail to cycle adequately.</li> <li><b>Consult Technical Service Bulletins (TSB)</b>: Search for TSBs that replicate the code, vehicle, and symptoms. This may provide a speedy solution to the diagnosis.</li></ul>

<p>The DTC code P2250 indicates an issue with the O2 Sensor Reference Voltage Circuit High for Bank 2 Sensor 1. This can affect the vehicle's fuel efficiency and emissions.</p><ul><li><b>Immediate Actions:</b> Inspect the O2 sensor and its wiring for damage or disconnection.</li><li><b>Potential Risks:</b> Delayed repair can lead to increased fuel consumption and potential damage to the catalytic converter.</li></ul>