2021 Audi e-tron Washer Fluid Level Warning TSB

Symptoms

Owners of 2021 Audi e-tron and other Audi models may experience a persistent "washer solvent level warning is on" message displayed in the driver information system (DIS). This warning appears even when the windshield washer fluid reservoir is confirmed to be full. Despite the warning, there is no functional restriction in the windshield washer system itself; the wipers and fluid dispense normally.

Technical Background

The root cause of the false "washer solvent level warning is on" message is often related to the sensitivity of the washer solvent level sensor, identified as G33. The operation of this sensor relies on the composition and concentration of the washer solvent. The presence of certain additives or an incorrect concentration of the fluid can contaminate the sensor probes, reducing their sensitivity and leading to inaccurate readings.

Important Warning

Audi emphasizes that it is not necessary to replace the windshield washer solvent level sensor (G33) if the problem is caused by contaminated sensor probes or an incorrect washer solvent solution. Warranty claims for the replacement of washer solvent level sensors that are found not to be faulty will not be reimbursed. This highlights the importance of proper diagnosis and cleaning before considering sensor replacement.

Repair Procedure Summary

To address the persistent "washer solvent level warning is on" in your 2021 Audi e-tron, a specific cleaning and fluid replacement procedure is recommended:

1. Empty Reservoir: Completely drain the washer fluid reservoir.
2. Sensor Access and Cleaning (Most Models): For all Audi vehicles except the A3 Sedan and A3 Cabriolet, remove the washer fluid level sensor. Clean the sensor probes thoroughly using all-purpose cleaner D 009 401 04 or, as an alternative, isopropyl alcohol. Reinstall the level sensor.
3. Sensor Access and Cleaning (A3 Sedan/Cabriolet): For Audi A3 Sedan and A3 Cabriolet models, where the sensor is not easily removable, the reservoir must be removed. Then, detach the filler neck from the reservoir to gain access to and clean the sensor probes.
4. Thorough Cleaning: Ensure the sensor probes are thoroughly cleaned. A cleaning brush with a rigid stem, approximately 10 inches long, saturated with the all-purpose cleaner or isopropyl alcohol, can be used to reach and clean the probes effectively.
5. Refill with Correct Solvent: Refill the reservoir with the correct type and concentration of washer fluid. Audi recommends fluids from their Top Service Supplies and Touch Up Paint eStore with a 35% pre-mix, suitable for temperatures down to -22°F. For colder conditions, Windshield Washer Fluid Concentrate ZAW 096 311 B can be used and mixed according to specific guidelines.
6. Check Concentration: Use a T10007A refractometer to check the concentration and freeze point of the newly added washer fluid. Adjust the concentration as needed to accommodate local weather conditions.

Concentration Guidelines for ZAW 096 311 B:

Freeze protection	Windshield Washer Fluid Concentrate ZAW 096 311 B	Water
-16 °C (3° F)	1 part	3 parts
-30 °C (-22° F)	1 part	2 parts
-32 °C (-25° F)	1 part	1.5 parts

Required Tools and Parts

To perform this service, the following parts and tools are specified:

• All-purpose cleaner: D 009 401 04 (or isopropyl alcohol)
• Windshield Washer Fluid Concentrate: ZAW 096 311 B (item number 128429)
• Washer solvent alternative for states with VOC restrictions: Item #121133 / WWFDRUM
• Refractometer: T10007A
• Fasteners, Bolts, Nuts and Screws: As needed per the Repair Manual (refer to ETKA/ELSA)

Warranty Information

Warranty claims for this issue should be submitted using Service Number 9258 and Damage Code 0040. The claim types are applicable for vehicles up to 48 months/50,000 miles, or G10 for CPO Covered Vehicles. If the vehicle is outside warranty, this Technical Service Bulletin serves as informational guidance. Specific labor operations include:

• Fluid level sensor remove and reinstall: 9258 19XX
• Windshield washer reservoir remove and reinstall: 9260 19XX
• Clean fluid level sensor and adjust solvent concentration: 9258 2999 (10 TU)

Owner Action

If your 2021 Audi e-tron displays a persistent "washer solvent level warning" even with a full reservoir, it is recommended to visit an authorized Audi service center. They can perform the diagnostic and cleaning procedure outlined in TSB 2038151/15 to resolve the issue without unnecessary sensor replacement. This will ensure your Audi e-tron washer warning is correctly addressed.

Source: NHTSA ID 10240212