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P2628 is a diagnostic trouble code (DTC) for "O2 Sensor Pumping Current Trim Circuit / High Bank 1 Sensor 1". 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.
The P2628 code is a generic powertrain code related to computer circuit output issues. This code appears when the oxygen sensor pumping current trim circuit for engine bank 1 has sent the engine control module (ECM) a voltage signal too high for the accepted variances. This code usually relates to the bank of the engine block with the number 1 cylinder, and sensor 1 is the upstream sensor, which is ahead of the catalytic converter.
The P2628 code is related to:
If a P2628 code is stored, the ECM has detected a variation of 10% or higher than the accepted voltage levels. The sensor detects oxygen content in a vehicle's exhaust gas and sends the voltage information to the ECM, which controls fuel injection durations.
For proper engine function, 14:7 air/fuel ratio must be present. The ECM controls the fuel delivery, timing of the ignition, and the fuel injector pulse. It also receives signals from several sensors to help ensure proper fuel delivery and air/fuel ratios. The heated oxygen sensor helps detect oxygen levels in a vehicle’s exhaust system and measures if the engine is running lean or rich. The oxygen sensor features a heater that is warmed with an electrical voltage to help warm it up for quick measurements faster than simply through using the heat of the exhaust gases, thus decreasing emissions and the length of time for a vehicle to enter a closed-loop mode.
A P2628 code can also be stored if the when the engine is running in a closed loop and oxygen sensor readings remain constant for usually more than eight seconds.
The P2628 code is caused by several potential problems, including:
The symptoms of a P2628 code include:
A mechanic will diagnose a P2628 code in a number of ways, including:
One of the most common mistakes when diagnosing a P2628 code includes the replacement of oxygen sensors when the actual cause are lean or rich engine conditions. In addition, ensure the correct oxygen sensor is being replaced.
Because a vehicle with a P2628 code should operate normally, but may exhibit increased emissions and decreased fuel efficiency, this is not considered a serious issue, but it is still recommended that you have the code diagnosed and repaired sooner rather than later.
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