2022 Volkswagen Jetta Owners Manual - Exhaust system

Exhaust system

 Introduction

The exhaust-relevant components reduce exhaust emissions:

• Catalytic converter ⇒ Catalytic converter.

• Particulate filter (depending on the 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.

Catalytic converter

 Please read the introductory information and heed the Warnings and Notice ⇒ andSafety precautions for handling fuel.

To ensure that the exhaust system and the engine catalytic converter can work correctly for a long time, observe the following:

• Only refuel with fuel permitted for the vehicle.

• 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 an authorized Volkswagen dealer or authorized Volkswagen Service Facility. 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 ⇒ andSafety 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.

Troubleshooting

 Please read the introductory information and heed the Warnings and Notice ⇒ andSafety precautions for handling fuel.

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. This process results in an autonomous cleaning process for the particulate filter and can take some time. If the indicator light does not turn off, immediately consult suitably qualified professionals for assistance. Volkswagen recommends contacting an authorized Volkswagen dealer or authorized Volkswagen Service Facility.

Automatic fuel tank ventilation malfunction

If the fuel tank is opened without prior ventilation, fuel vapors will escape from the filler neck. This may lead to temporary odors.

Opening the fuel tank without ventilation:

1. Press the release button .

   The fuel filler flap will release without ventilation.

2. Open the fuel filler flap.

Refueling with an automatic fuel tank ventilation malfunction:

1. Hold the fuel pump nozzle handle down to ensure optimum refueling.

2. Only continue carefully in this case until the fuel tank is full.

3. If the automatic ventilation process is still not working, contact a suitably qualified professional and have the ventilation system checked. Volkswagen recommends contacting an authorized Volkswagen dealer or authorized Volkswagen Service Facility.

The fuel pump nozzle may turn off prematurely when refueling due to the lack of ventilation.

 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 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.