When cleaning the DEF quality sensor, avoid using alcohol or corrosive solvents. It is recommended to gently wipe the sensor surface using a dry or slightly damp microfiber cloth. If the issue persists, a system reset or professional diagnostic inspection is advised.
According to vehicle maintenance guidelines, the DEF quality sensor is extremely sensitive to the purity of the urea solution; improper cleaning may damage its precision coating or internal circuitry. The following are specific operational recommendations:
**Power Disconnection and Removal for Inspection**
Before cleaning, ensure the vehicle's power supply is turned off to prevent electrostatic discharge or short circuits from damaging the sensor. If deep cleaning is required, the sensor should be removed by a trained professional to avoid damaging the connectors through forceful or improper handling.
**Proper Cleaning Methods**
Use a lint-free cloth or lens cleaning cloth to gently wipe the sensor probe. Dampen the cloth with a small amount of *purified water* only if the stains are heavy; never spray liquid directly onto the sensor. Strictly avoid using organic solvents—such as isopropyl alcohol—as they may corrode the sensor's anti-reflective coating and plastic housing.
**Dust Removal and Drying**
A manual air blower (such as a camera blower bulb) may be used to remove adhering dust. Do *not* use canned compressed air, as residual propellants may contaminate the sensor surface. After cleaning, allow the sensor to air-dry naturally for several minutes before reinstalling it.
**Troubleshooting Persistent Faults**
If the DEF fault indicator remains illuminated after cleaning, residual fault codes may still be stored in the system. Try starting the engine and driving for at least 15 minutes to allow the SCR system to complete its automatic self-diagnostic cycle. If the issue remains unresolved, use a diagnostic scanner to retrieve the fault codes and troubleshoot for potential issues such as sensor aging or poor electrical connections.
As part of routine maintenance, check the DEF fluid level every time you refuel and use only certified urea products (e.g., those meeting CGT standards); this effectively minimizes the risk of sensor contamination. Before parking the vehicle for an extended period, ensure the DEF tank is properly sealed to prevent crystallization that could clog the fluid lines.
When cleaning the DEF quality sensor, avoid using alcohol or corrosive solvents. It is recommended to gently wipe the sensor surface using a dry or slightly damp microfiber cloth. If the issue persists, a system reset or professional diagnostic inspection is advised.
According to vehicle maintenance guidelines, the DEF quality sensor is extremely sensitive to the purity of the urea solution; improper cleaning may damage its precision coating or internal circuitry. The following are specific operational recommendations:
**Power Disconnection and Removal for Inspection**
Before cleaning, ensure the vehicle's power supply is turned off to prevent electrostatic discharge or short circuits from damaging the sensor. If deep cleaning is required, the sensor should be removed by a trained professional to avoid damaging the connectors through forceful or improper handling.
**Proper Cleaning Methods**
Use a lint-free cloth or lens cleaning cloth to gently wipe the sensor probe. Dampen the cloth with a small amount of *purified water* only if the stains are heavy; never spray liquid directly onto the sensor. Strictly avoid using organic solvents—such as isopropyl alcohol—as they may corrode the sensor's anti-reflective coating and plastic housing.
**Dust Removal and Drying**
A manual air blower (such as a camera blower bulb) may be used to remove adhering dust. Do *not* use canned compressed air, as residual propellants may contaminate the sensor surface. After cleaning, allow the sensor to air-dry naturally for several minutes before reinstalling it.
**Troubleshooting Persistent Faults**
If the DEF fault indicator remains illuminated after cleaning, residual fault codes may still be stored in the system. Try starting the engine and driving for at least 15 minutes to allow the SCR system to complete its automatic self-diagnostic cycle. If the issue remains unresolved, use a diagnostic scanner to retrieve the fault codes and troubleshoot for potential issues such as sensor aging or poor electrical connections.
As part of routine maintenance, check the DEF fluid level every time you refuel and use only certified urea products (e.g., those meeting CGT standards); this effectively minimizes the risk of sensor contamination. Before parking the vehicle for an extended period, ensure the DEF tank is properly sealed to prevent crystallization that could clog the fluid lines.
