Table of Contents > Descriptions of work > Reducing agent (AdBlue®/DEF): changing

VW Passat B8 Service Manual ➜ Reducing agent (AdBlue®/DEF): changing

Passat 2015 ➤, Passat 2019 ➤, Passat Variant 2015 ➤, Passat Variant 2019 ➤  
Maintenance - Edition 11.2020  
Reducing agent (AdBlue®/DEF):  
Sequence of operations  
– ⇒ 4-cylinder common rail (2.0 l, 4V, bi-turbocharger); Rep.  
gr. 26; SCR system (Selective Catalytic Reduction)  
Tyre pressure indicator: calibrating  
The calibration of the Tyre Pressure Loss Indicator must on‐  
ly be performed “after” the tyre pressure has been corrected  
to the prescribed values.  
If no pressure loss and tyre damage are found after a tyre  
pressure warning, the incorrect warning can be rectified by  
Tyre Pressure Loss Indicator compares the speed and thus  
the rolling circumference and vibrations of the individual wheels  
via the ABS sensors. If the tyre pressure changes on one or  
several wheels, the Tyre Pressure Loss Indicator will indicate  
this in the dash panel insert and the Infotainment system.  
The rolling circumference of tyre changes if:  
♦ The tyre pressure is too low.  
♦ The tyre has structural damage.  
♦ The vehicle is loaded more heavily on one side.  
♦ The wheels on one axle are loaded more heavily (e.g. when  
towing a trailer or when driving in mountains).  
♦ Snow chains are fitted.  
♦ The temporary spare wheel is fitted.  
♦ One wheel per axle has been changed.  
The tyre pressure monitoring warning lamp has a yellow warn‐  
ing lamp in the dash panel insert -arrow-.  
♦ A “PERMANENT LIGHTING-UP” in conjunction with a warn‐  
ing tone, means “WARNING”, pressure loss has been detec‐  
ted, check tyre pressure and carry out calibration.  
– Switch on ignition.  
– Switch on Infotainment system.  
4. Descriptions of work  

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