When your car’s check engine light comes on, it can be a cause for concern. One of the most common causes of an illuminated check engine light is the presence of an OBD-II (On-Board Diagnostics) code. These codes are designed to help mechanics quickly identify the underlying issue with your vehicle. One such code is P20E8, which indicates a “Reductant Pressure Too Low” issue. In this article, we will dive deep into what P20E8 means, how to diagnose and repair the issue, and answer some common questions about this OBD-II code.
What is OBD-II Code P20E8?
OBD-II Code P20E8 refers to a problem with the reductant (emission control) system pressure. Specifically, the code indicates that the pressure is too low, which can cause the emission levels to exceed the legal limits in your area. The reductant system helps reduce the NOx emissions from your vehicle, which contribute to air pollution and can cause respiratory issues in humans.
What causes OBD-II Code P20E8?
There are several potential causes of P20E8. The most common include:
1. Faulty reductant pump: The pump may have worn out or is malfunctioning, leading to a decrease in pressure.
2. Clogged filter: The reductant system has a filter that can become clogged with debris and affect the pressure.
3. Leaking reductant line: A break or leak in the reductant line can cause a drop in pressure and trigger the code.
4. Sensor failure: The sensor that monitors the pressure in the reductant system may fail or provide inaccurate readings.
How do you diagnose and repair OBD-II Code P20E8?
To diagnose and repair P20E8, follow these steps:
1. Use an OBD-II code scanner to retrieve the code from your vehicle’s computer system.
2. Inspect the reductant system to ensure there are no obvious issues like leaks or damage to the pump and sensors.
3. Check the reductant pump itself, paying close attention to the inlet and outlet ports. Ensure they are free from debris and not clogged altogether.
4. Inspect the filter in the reductant system to ensure it is clean and can allow adequate flow through the system.
5. If none of the above issues are found, replace the pressure sensor, which monitors the pressure from the reductant system, or check the wiring that leads to the sensor.
6. Clear the code using the OBD-II scanner and drive your car to ensure the code doesn’t reoccur.
FAQs:
1. Can I continue to drive my car with P20E8?
It’s not recommended to drive your cars with this error. If the problem is not resolved, driving your vehicle with OBD-II Code P20E8 could cause high NOx emission levels, which can make them fail the emissions tests and potentially lead to fines.
2. How much will it cost to repair P20E8?
The cost will depend on the reason for the code. If it requires a new sensor or pump, the total could range between $300 to $800. If there is an issue with the filters or clogs within the system, it could be relatively under $100.
3. How long will the repair take to complete?
The repair time is dependent on the type of repair and the severity of the problem. Typically, P20E8 repair will take between 2-4 hours.
4. What happens if I don’t repair P20E8?
If you neglect to repair P20E8, your vehicle may not pass an emissions test, which is required by law in most states. High NOx levels can lead to pollution concerns, and this can lead to a ticket or hefty fine.
5. Can I repair P20E8 on my own?
It depends on your expertise with car repairs. Advanced knowledge practices would help you in resolving such codes. It is best to seek the help of an experienced mechanic to ensure that the issue is correctly diagnosed and repaired.
Conclusion:
OBD-II Code P20E8 is a warning that the reductant pressure in your vehicle is too low, and NOx emissions may be too high. Although it may only seem like a small issue at first, it could cause significant damage if it goes untreated. By following the diagnosis and repair steps outlined above, you can take steps to correct the problem and continue driving safely. If you still have concerns or do not feel comfortable repairing P20E8 on your own, it is best to take your vehicle to a reliable mechanic.