2014-2023 Volkswagen Passat SUV Fuel and emissions control system -> Exhaust system User Manual
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Fuel and emissions control system -> Exhaust system for Your Volkswagen Passat SUV Eight Generation (2014-2023)

Fig. 123 Behind the fuel filler flap: fuel tank cap (general example)  
Refueling procedure  
1. Open the fuel filler flap.  
2. Remove the fuel tank cap and insert it into the opening at the fuel filler flap provided for this fig. 123.  
3. Hold the fuel pump nozzle handle down to ensure optimum refueling.  
4. The fuel tank is full once the fuel pump nozzle turns off for the first time  
5. Screw the fuel tank cap onto the fuel filler neck.  
6. Close the fuel filler flap.  
.
WARNING  
Fuel may spray out and overflow if the fuel tank is overfilled. This can cause explosions, fires, and serious injuries.  
Do not continue filling after the pump nozzle switches off for the first time.  
NOTICE  
Every six months, if possible, run the fuel tank empty until the indicator light comes on and refuel it. This is required to maintain the system functions and fuel  
quality necessary for gasoline-powered engines.  
Fuels can contaminate the environment. Collect any leaking operating fluids and dispose of them according to legal regulations.  
Exhaust system  
Introduction  
The exhaust-relevant components reduce exhaust emissions:  
Catalytic converter Catalytic converter  
Particulate filter (depending on vehicle equipment) Particulate filter  
WARNING  
Engine exhaust contains carbon monoxide, which can cause loss of consciousness and death.  
Do not allow the engine to run in confined spaces.  
Never start the engine in confined spaces.  
Do not leave your vehicle unattended while the engine is running.  
WARNING  
Exhaust system components will become very hot. This can cause fires.  
Park the vehicle in such a way so that no exhaust system components come into contact with flammable materials under the vehicle such as brush,  
leaves, dry grass, etc.  
Never use additional underbody protection or corrosion protection on exhaust pipes, catalytic converters, particulate filters or heat shields.  
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Catalytic converter  
Please read the introductory information and heed the Warnings and Notice   
and  
Safety precautions for handling fuel.  
To ensure that the exhaust system and the gasoline engine catalytic converter can function correctly for a long time:  
Only refuel with unleaded gasoline.  
Never drive until the fuel tank is completely empty Refueling.  
Never add too much engine oil Checking the engine oil level and adding oil .  
Do not tow-start the vehicle; use jump-start assistance instead Jump-starting.  
If there are engine misfires, loss of power, or poor engine operation while driving, reduce the speed immediately and have the vehicle checked by suitably qualified  
professionals Troubleshooting. Volkswagen recommends contacting your Volkswagen dealership. Otherwise, uncombusted fuel could be present in the exhaust  
system and then enter the atmosphere. The catalytic converter may also be damaged from overheating.  
The exhaust may smell like sulfur when the emissions control system is running correctly.  
Particulate filter  
Please read the introductory information and heed the Warnings and Notice ⇒  
and  
Safety precautions for handling fuel.  
Function  
The particulate filter (depends on how your vehicle is equipped) filters out soot from the exhaust gas.  
Regeneration  
With normal vehicle usage, the filter cleans itself. If the filter is unable to clean itself, e.g. if you only make short trips for an extended period of time, the filter can  
become blocked with soot. The particulate filter needs to be cleaned (regenerated).  
Noises, light odors, and increased engine speeds may occur during the regeneration. The radiator fan may continue to run while driving and after turning off the  
engine.  
To assist in particulate filter regeneration, Volkswagen recommends avoiding driving short distances too frequently.  
The soot in the particulate filter is burned periodically at high temperatures. The yellow  
indicator light does not turn on during a periodic regeneration.  
Safety precautions for handling fuel.  
Troubleshooting  
Please read the introductory information and heed the Warnings and Notice ⇒  
and  
If the engine does not run smoothly and malfunctions  
If the engine does not run smoothly or malfunctions while driving, it can indicate poor fuel quality.  
1. Reduce your speed immediately.  
2. Drive with a moderate RPM and low engine load to the nearest suitably qualified professional. Volkswagen recommends contacting an authorized Volkswagen  
dealer or authorized Volkswagen Service Facility.  
3. If these symptoms occur directly after refueling, stop the engine immediately to prevent subsequent damage.  
4. Contact an authorized Volkswagen dealer or authorized Volkswagen Service Facility for assistance.  
Particulate filter clogged with soot  
The yellow  
indicator light turns on.  
The particulate filter is clogged with soot and a regeneration is necessary.  
Prerequisite for the regeneration drive: The engine is at operating temperature.  
For gasoline engines  
1. Drive at a speed of at least 50 mph (80 km/h).  
2. Take your foot completely off the accelerator pedal for a few seconds to let the vehicle roll with a gear engaged.  
3. Repeat this process (acceleration and letting the vehicle roll) until the indicator light goes out.  
4. If the indicator light does not go out after some time, immediately consult suitably qualified professionals for assistance. Volkswagen recommends contacting a  
authorized Volkswagen dealer or authorized Volkswagen Service Facility.  
Exhaust-related malfunction  
The yellow  
indicator light turns on.  
An exhaust-related component is malfunctioning, which could damage the vehicle.  
1. Contact a suitably qualified professional and have the engine and the exhaust system checked. Volkswagen recommends contacting an authorized Volkswagen  
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dealer or authorized Volkswagen Service Facility.  
Misfire  
The yellow  
indicator light flashes.  
There is misfire which could damage the vehicle.  
1. Contact a suitably qualified professional and have the engine and the exhaust system checked. Volkswagen recommends contacting an authorized Volkswagen  
dealer or authorized Volkswagen Service Facility.  
WARNING  
If you perform driving maneuvers that other road users cannot anticipate, you may cause an accident.  
Always adapt your speed and driving style to the visibility, weather, road and traffic conditions.  
Follow the road traffic laws and regulations that apply in the country you are driving in.  
If the indicator lights are on or flashing, it is likely that there is an engine malfunction and that fuel consumption will increase.  
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