Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
To diagnose the P2626 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.
This fault code is stored in the engine control module when a fault is detected with the oxygen sensor current flow circuit. A wideband oxygen sensor is used to measure the actual air to fuel ratio, this is necessary for modern lean burn spark ignition engines and compression ignition engines. A wideband sensor incorporates two sensors integrated into one component. The first part of the sensor is a narrowband cell that samples the exhaust gas (in a measurement chamber) and the outside atmospheric air. The control module maintains a voltage of 450 millivolts from the narrowband sensor, this equates to a lambda value of one. This is referred to as the reference voltage. In order to maintain this value of lambda one, the second part of the sensor is used, it is a pump cell. This is a chemical pump, and if the sampled exhaust gas is comparatively rich the pump cell is supplied with a negative current to "pump" oxygen into the measurement chamber. Conversely, if the sampled exhaust gas is lean the pump cell is supplied with a positive current to "pump" oxygen out of the measurement chamber. The polarity and magnitude of the current flow is a direct indication of the air to fuel ratio.
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