In the VW T5 vehicle type, model year 2004, the problem of fogged windows may be caused by a faulty evaluation function of the air quality sensor.
Air quality sensor (figure).
The built-in evaluation electronics in the sensor module responds to changes in the conductivity of the sensor.
Due to the design, the function or the evaluation of the air quality sensor may be affected by the influence of spray or drip water in this type of vehicle. (The air quality sensor is located below the windshield in the region of the fresh air intake.)
Solution:
Check the function of the air quality sensor
Check the fuse 22
Install a spray and drip water deflector for the sensor.
Additional information for service:
According to information from the manufacturer, the air quality sensor is not subject to wear under normal conditions.
The combfilter (interior filter) should be replaced at service intervals.
Important safety notice
The following technical information and tips for practical use have been set up by HELLA in order to offer professional support to automotive workshops in their daily work. The information available here on this website is only to be used by appropriately trained specialist staff.
The reprinting, distribution, reproduction, exploitation in any form and disclosure of the contents of this document, even in part, is prohibited without our express written approval and indication of the source. The schematic illustrations, figures and descriptions are for explanation and presentation of the document text and cannot be used as a basis for installation or design. All rights reserved.
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