[SOLVED] P1622 Code – Fix High Oxygen Sensor Reference Voltage Circuit

If you’ve noticed that your engine light is on or you’ve received a service engine soon warning, it’s important to understand what the fault code P1622 means. This code is typically triggered by a faulty downstream or upstream O2 sensor, an open or shorted sensor harness, or a poor electrical connection in the sensor circuit.

To fix this issue, start by visually inspecting the wiring harness and connectors for any damage.

Look out for broken, bent, pushed out, or corroded pins in the connectors.

It’s crucial to address this problem promptly as it can affect your vehicle’s performance.

The repair time for this issue is estimated to be around 1.0 hour.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

When the engine light is on or the service engine soon warning light is illuminated, it could be a sign of the p1622 fault code.

  • The symptoms of the automobile fault code p1622 include the Engine Light being ON or the Service Engine Soon Warning Light being illuminated.

The automobile fault code p1622 can be caused by a faulty O2 sensor, open or shorted sensor harness, or poor electrical connection.

  • The fault code P1622 can be caused by the following: a faulty downstream or upstream O2 sensor, an open or shorted harness for any downstream or upstream O2 sensor, and a poor electrical connection in the circuit of any downstream or upstream O2 sensor.

To fix the p1622 fault code, start by visually inspecting the wiring harness, connectors, and components for any damage or corrosion.

  • To fix the automobile fault code p1622, you need to follow these steps: 1.
  • Check the possible causes mentioned above.
  • 2.
  • Visually inspect the wiring harness and connectors related to the fault code.
  • 3.
  • Look for any damaged components.
  • 4.
  • Check for broken, bent, pushed out, or corroded pins in the connectors.
  • 5.
  • Repairing this fault code is estimated to take approximately 1.0 hour.

The factors influencing the cost of diagnosing and fixing the automobile fault code p1622 include the estimated repair time of 1.0 hour and the typical hourly rate charged by auto repair shops, which ranges between $75 and $150.

The P1622 fault code refers to the oxygen sensor reference voltage circuit being too high.

In order for the oxygen sensor to function properly, it needs to be heated to operating temperature. The sensor has a built-in resistive heater element that allows it to reach operating temperature quickly. The powertrain control module (PCM) calculates the heater resistance and temperature by measuring the battery voltage and current draw on the heater control circuit.

The PCM continuously monitors the heater temperature and adjusts the heating rate to prevent damage to the heating element.

If the PCM detects a fault in the oxygen sensor heater circuitry, it disables the internal PCM driver for the current ignition cycle, and the P1622 diagnostic trouble code is set when the sensor return circuit voltage is above approximately 3.7 volts for 9.0 seconds.

What are the possible causes of fault code P1622 in an automobile?

If you’re seeing the engine light on or the service engine soon warning light in your automobile, it could be due to fault code P1622. This code is often caused by a faulty downstream or upstream O2 sensor, an open or shorted sensor harness, or a poor electrical connection in the sensor circuit. To fix this issue, visually inspect the wiring harness and connectors, checking for any damage or corrosion. Additionally, look out for broken, bent, pushed out, or corroded pins in the connectors.

How can I visually inspect the wiring harness and connectors to fix fault code P1622?

If you’re dealing with fault code P1622 and your engine light is on, it’s time to visually inspect the wiring harness and connectors. This code can be caused by a faulty downstream or upstream O2 sensor, an open or shorted sensor harness, or a poor electrical connection in the sensor circuit. To fix it, check the possible causes mentioned earlier and give the wiring harness and connectors a thorough visual inspection. Look out for any damaged components and check for broken, bent, pushed out, or corroded pins in the connectors.

What should I look for when checking for damaged components and connector pins to resolve fault code P1622?

When resolving fault code P1622, start by checking for damaged components and connector pins. Visually inspect the related wiring harness and connectors, looking for any broken, bent, pushed out, or corroded pins. This can help identify any issues with the downstream or upstream O2 sensor, such as an open or shorted harness or poor electrical connection. By addressing these possible causes, you can resolve the symptom of the engine light being on.

p1622 error fault code explained

If you’re seeing the Engine Light ON or the Service Engine Soon Warning Light, it could be due to a faulty O2 sensor or issues with its wiring.

To fix this, visually inspect the wiring harness and connectors, checking for any damage or corrosion. Look out for broken or bent pins as well.

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