DTC Code P2628 – What does this code mean?

<ul> <li><a href="/problems/engine-warning-light-on"><b>Engine Light ON</b></a>: The check engine light or service engine soon warning light illuminates on the dashboard, indicating an issue with the oxygen sensor pumping current trim circuit.</li> <li><a href="/problems/high-fuel-consumption"><b>Poor Fuel Economy</b></a>: The vehicle may experience reduced fuel efficiency due to incorrect air-fuel mixture adjustments.</li> <li><a href="/problems/rough-idle"><b>Rough Idle</b></a>: The engine may idle roughly or inconsistently, as the oxygen sensor is not providing accurate data for fuel mixture adjustments.</li> <li><a href="/problems/high-co-emissions-at-increased-idle"><b>Increased Emissions</b></a>: Higher emissions may be observed due to improper combustion, as the oxygen sensor is not functioning correctly.</li> </ul>

<ul><li>The heated oxygen sensor may be faulty, leading to incorrect readings and triggering the error code.</li><li>An open or shorted harness in the heated oxygen sensor can disrupt the signal, causing the circuit to register high.</li><li>Poor electrical connections in the heated oxygen sensor circuit can result in intermittent or incorrect signals, affecting the sensor's performance.</li></ul>

<ul> <li><b>Initial Scan and Visual Inspection</b>: Begin by using an OBD-II scanner to confirm the P2628 code. Perform a visual inspection of the oxygen sensor wiring and connectors for any signs of damage, corrosion, or disconnection.</li> <li><b>Check Oxygen Sensor Operation</b>: Use a multimeter to measure the voltage and resistance of the Bank 1 Sensor 1 oxygen sensor. Compare the readings with the manufacturer's specifications to ensure proper operation.</li> <li><b>Inspect the Fuel System</b>: Examine the fuel system for any leaks or blockages that could affect the air-fuel mixture. Check the fuel pressure and ensure it is within the specified range.</li> <li><b>Test the Exhaust System</b>: Inspect the exhaust system for any leaks or restrictions that could impact the oxygen sensor's readings. Ensure the catalytic converter is functioning correctly.</li> <li><b>Evaluate the Engine Control Module (ECM)</b>: Check the ECM for any software updates or faults that could be causing incorrect oxygen sensor readings. Reprogram or replace the ECM if necessary.</li> <li><b>Perform a Road Test</b>: After completing repairs, conduct a road test to ensure the P2628 code does not return and that the vehicle operates smoothly without any symptoms.</li></ul>

<p>The DTC P2628 indicates a high current in the oxygen sensor pumping circuit for Bank 1 Sensor 1. This issue can lead to <b>incorrect air-fuel mixture readings</b>, potentially affecting engine performance and fuel efficiency. If left unaddressed, it may cause <b>increased emissions</b> and potential damage to the catalytic converter. Prompt attention is advised to prevent further complications.</p>