2021 VOLKSWAGEN T-ROC warning light

correct openings. The use of incorrect service fluids could result in serious malfunctions and engine
damage.

The engine oil level must never be above area ⇒ Fig. 186  Ⓑ. Otherwise oil can be drawn in through
the crankcase breather and escape into the atmosphere via the exhaust system.
Troubleshooting
First read and observe the introductoryinformation and safety warnings⇒Introduction 
and Engine oil pressure too low
The central warning lamp lights up red and the text message Stop vehicle. Oil pressure. Observe
vehicle wallet is displayed.
Do not drive on!
Switch off the engine and check the engine oil level. Checking the engine oil level ⇒ Checking the
engine oil level and refilling the engine oil . - Do not drive on or allow the engine to run if the
warning lamp is flashing although the engine oil level is correct. The engine could otherwise be
damaged. Seek expert assistance.
and Engine oil level too low
The central warning lamp lights up red and the text message Refill engine oil. is displayed.
Engine oil level is too low. Switch off the engine.
Checking the engine oil level ⇒ Checking the engine oil level and refilling the engine oil .
and Engine oil level low
The central warning lamp lights up yellow and the text message Check oil level. is displayed.
Engine oil level is low. Switch off the engine.
Checking the engine oil level ⇒ Checking the engine oil level and refilling the engine oil .
and Fault in engine oil system
The central warning lamp lights up yellow and the text message Oil sensor: workshop. is displayed.
Engine oil system is faulty. Go to a qualified workshop and have the engine oil sensor checked.
and Engine oil level too high
The central warning lamp lights up yellow and the text message Reduce oil level. is displayed.
Engine oil level is too high. Switch off the engine.
Check the engine oil level. Checking the engine oil level ⇒ Checking the engine oil level and refilling
the engine oil . Seek expert assistance.

Fig. 188 In the engine compartment: markings on the coolant expansion tank.

Fig. 189 In the engine compartment: coolant expansion tank cap (illustration).
First read and observe the introductoryinformation and safety warnings⇒Introduction 
The warning lamp for the engine coolant will light up if the engine coolant level is too low.
Preparations

⇒ .
nnet ⇒ In the engine compartment .
on the cap ⇒ Fig. 189 .
Checking the coolant level
tank ⇒ Fig. 188 . The coolant level must be between the marks.
When the engine is warm, the engine coolant level may be slightly above the maximum (MAX) mark.
Refilling coolant
the cap of the coolant expansion tank.
⇒ .
⇒ Coolant specification ⇒
 .

Brake fluid that is compliant with VW standard 501 14 is available from Volkswagen dealerships.
If this brake fluid is not available and it is necessary to use another high-quality brake fluid instead,
brake fluid that is compliant with DIN ISO 4925 CLASS 4 or US standard FMVSS 116 DOT 4 can be
used.
Not all brake fluids that are compliant with DIN ISO 4925 CLASS 4 or US standard FMVSS 116 DOT 4
have the same chemical composition. Some of these brake fluids may contain chemicals that can
damage or destroy brake system components over time.
Volkswagen therefore recommends the use of brake fluid that is compliant with VW standard 501 14
to ensure sustained proper operation of the brake system.
Brake fluid that is compliant with VW standard 501 14 fulfils the requirements of DIN ISO 4925
CLASS 4 or US standard FMVSS 116 DOT 4.
Brake fluid level
The brake fluid level must always be between the MIN and MAX marking on the brake fluid reservoir
or above the MIN marking ⇒ .
The brake fluid level cannot be checked accurately in all models as engine components may partially
conceal the fluid level in the brake fluid reservoir. If the brake fluid level cannot be read exactly,
please go to a qualified workshop.
The brake fluid level drops slightly during vehicle operation as the brake pads wear and the brakes
are automatically adjusted.
Brake fluid level
The indicator lamp lights up red.
Brake fluid level is too low.
Do not drive on! Check the brake fluid level.
If the brake fluid level is too low, inform a qualified workshop. Have the brake system checked.
Changing the brake fluid
The brake fluid should be changed by a qualified workshop. Volkswagen recommends using a
Volkswagen dealership for this purpose. Only brake fluid that conforms with the required
specification should be used.

WARNING
Brake failure or reduced braking efficiency can be caused by the brake fluid level being too low or by
brake fluid that is too old or unsuitable.

Do not work on the electrical system unless you are familiar with the task, aware of the general
safety procedures and have the correct equipment, service fluids and suitable tools. Serious injuries
can be caused by carrying out work incorrectly ⇒ . All work should be carried out by a qualified
workshop. Volkswagen recommends using a Volkswagen dealership for this purpose.
Information for warning and indicator lamps lit up can be found in the troubleshooting at the end of
the chapter ⇒ Troubleshooting .
Location of the 12-volt vehicle battery
The 12-volt vehicle battery is located in the engine compartment.
Explanation of the warnings on the 12-volt vehicle battery
Always wear eye protection!Electrolyte is very corrosive and caustic. Always wear
protective gloves and eye protection!Fire, sparks, naked lights and smoking are prohibited!
A highly explosive mixture of gases is given off when the 12-volt vehicle battery is charging!
Always keep children away from electrolyte and the 12-volt vehicle battery!Always
observe the owner's manual!

WARNING
Any work on the 12-volt vehicle battery and the electrical system can cause serious chemical burns,
fire or electric shocks. Always read and observe the following warnings and safety information
before carrying out any kind of work:
any work on the 12-volt
vehicle battery and also disconnect the negative cable from the 12-volt vehicle battery.
-volt vehicle battery.

12-volt vehicle battery, ensure that your hands, arms and face in particular are protected from acid
spillages.
r work near naked flames or sparks.
discharge.

-volt vehicle battery. It can explode. Damaged 12-volt vehicle batteries
must be replaced as soon as possible.

Fig. 192 Battery window on the top of the 12-volt vehicle battery (illustration).
First read and observe the introductoryinformation and safety warnings⇒Introduction 
The electrolyte level of the 12-volt vehicle battery should be checked regularly in high-mileage
vehicles, in hot countries and in older 12-volt vehicle batteries. The 12-volt vehicle battery is
otherwise maintenance-free.
Vehicles with an auxiliary heater ⇒ Auxiliary heater and ventilation  are fitted with special vehicle
batteries. The electrolyte level of these 12-volt vehicle batteries cannot be checked for technical
reasons. Go to a qualified workshop to have the 12-volt vehicle battery checked.
Preparations
eparing the vehicle for working in the engine compartment ⇒ In the engine compartment .
⇒ In the engine compartment .
Checking the electrolyte level (12-volt vehicle batteries with battery window)
e for you to clearly see the colour indicator in the round
battery window on the top of the 12-volt vehicle battery ⇒ Fig. 192  (arrow). Never use naked
flames or glowing objects as a light source.
s according to the electrolyte level in the
12-volt vehicle battery.
Light yellow or without colourThe electrolyte level of the 12-volt vehicle battery is too low. The 12-
volt vehicle battery should be checked and replaced by a qualified workshop if necessary.BlackThe
electrolyte level of the 12-volt vehicle battery is correct.

WARNING
Any work on the 12-volt vehicle battery can cause serious chemical burns, explosions and electric
shocks.

Connecting the 12-volt vehicle battery
-volt vehicle
battery.
e cable and then the negative cable ⇒ .
Various indicator lamps may light up after the 12-volt vehicle battery has been connected and the
ignition is switched on. They will go out when you drive a short distance at a speed of approximately
15 – 20 km/h (10 – 12 mph). If the indicator lamps remain lit up, the vehicle should be checked by a
qualified workshop.
If the 12-volt vehicle battery was disconnected for an extended period, the system may not able to
calculate or correctly display the time when the next service is due ⇒ Instrument cluster . Observe
the maximum permissible service intervals ⇒ Service .
Automatic switch-off for electrical consumers
The intelligent vehicle electrical system management function automatically implements a range of
measures to prevent the 12-volt vehicle battery from discharging under high loads:


power supply to the 12-volt socket and the cigarette lighter may be interrupted temporarily
while the engine is being started.
The vehicle electrics management system cannot always prevent the 12-volt vehicle battery from
being discharged, for example if the ignition is left on over a long period with the engine off or the
side lights or parking lights are left on over a long period of time.
12-volt vehicle battery is discharged
gnition is switched on.

⇒ Auxiliary heater and ventilation .

WARNING
Incorrectly mounting the battery and using incorrect 12-volt vehicle batteries can cause short
circuits, fire and serious injuries.
-free and leak-proof 12-volt vehicle batteries that have the same
properties, specifications and dimensions as the factory-fitted 12-volt vehicle battery.

WARNING
A highly explosive mixture of gases is given off when the 12-volt vehicle battery is being charged.

-volt vehicle batteries should be charged only in well-ventilated spaces.
-volt vehicle battery. Discharged 12-volt vehicle batteries can
already freeze at temperatures of around 0°C (+32°F).
-volt vehicle battery must be replaced if it has ever been frozen.
the negative cable.

NOTICE
-volt vehicle batteries if the ignition is switched on or the engine is
running. Never use a 12-volt vehicle battery that does not correspond with the vehicle's
specifications. This can damage the electrical system or electronic components and electrical
malfunctions can occur.
to the 12-volt socket or to the cigarette lighter in order to charge the 12-volt vehicle battery. The
electrical system of the vehicle could otherwise be damaged.

12-volt vehicle batteries may contain toxic substances such as sulphuric acid and lead. Dispose of the
12-volt vehicle battery in accordance with the regulations.

Electrolyte can pollute the environment. Collect any service fluids that escape or are spilt and
dispose of them properly.
Troubleshooting
First read and observe the introductoryinformation and safety warnings⇒Introduction 
Vehicle battery (12-volt)
The indicator lamp lights up red.
Fault in the alternator. The 12-volt vehicle battery will not be charged by the alternator while the
vehicle is in motion.
Switch off any electrical consumers that are not required. Inform a qualified workshop. Have the
electrical system checked.
The start/stop system cannot start the engine ⇒ Start/stop system .
and vehicle battery (12-volt)
The central warning lamp lights up red and the text message 12 V battery not charging. Stop vehicle.
is displayed.

Fault in the alternator. The 12-volt vehicle battery will not be charged by the alternator while the
vehicle is in motion.
Switch off any electrical consumers that are not required. Inform a qualified workshop. Have the
electrical system checked.
The start/stop system cannot start the engine ⇒ Start/stop system .
and vehicle battery (12-volt)
The central warning lamp lights up yellow and the text message 12 V battery low. Charge by driving.
is displayed.
The charge level of the vehicle battery is insufficient.
Recharge the 12-volt vehicle battery by driving the vehicle for an extended time.
The start/stop system cannot start the engine ⇒ Start/stop system .
and vehicle battery (12-volt)
The central warning lamp lights up red and the text message Replace 12 V battery. Workshop. is
displayed.
The vehicle battery condition is not ok.
Seek expert assistance and have the battery checked and replaced if necessary.
The start/stop system cannot start the engine ⇒ Start/stop system .
Wheels and tyres
Tyre monitoring system
Introduction
This chapter contains information on the followingsubjects:
⇒ Tyre Pressure Loss Indicator 
⇒ Troubleshooting for Tyre Pressure Loss Indicator 
The tyre monitoring system warns the driver when the tyre pressures are too low.
The tyre monitoring system monitors various parameters (for example, rolling circumference) of all
wheels using ABS sensors (indirect measurement).

WARNING
The intelligent tyre monitoring system technology cannot overcome the laws of physics, and
functions only within the limits of the system. Incorrect handling of the wheels and tyres can lead to
a sudden loss of pressure in the tyres, tread separation and even tyre blow-out.