Nissan Sentra B18 (2020-2025) Owner's Manual: Exhaust gas (carbon monoxide)

WARNING

• Never inhale exhaust gases, as they contain carbon monoxide, a colorless and odorless gas. Carbon monoxide is extremely hazardous and can quickly lead to loss of consciousness or death, even in short exposure situations.
• If you believe exhaust fumes are entering the Nissan Sentra, immediately open all windows fully and have the vehicle inspected by a qualified technician without delay.
• Do not operate the engine in enclosed or poorly ventilated areas such as garages, tunnels, or enclosed parking structures.
• Avoid leaving the Nissan Sentra parked with the engine running for extended periods of time, even outdoors.
• Keep rear vent windows, doors, and trunk lids (if so equipped) fully closed while driving. If any of these must remain open, exhaust gases may be drawn into the passenger compartment. In such cases, follow these precautions:
  1. Open all windows to allow fresh air circulation.
  2. Set the air recirculation button to OFF and adjust the fan control dial to the highest setting to promote air flow.
• If electrical wiring or other cable connections must pass through the trunk lid seal or body panels, follow the equipment manufacturer’s recommendations to prevent carbon monoxide from entering the Nissan Sentra cabin.
• The exhaust system and vehicle body should be inspected by a qualified mechanic whenever:
  1. The vehicle is raised for service or maintenance.
  2. You suspect exhaust fumes are entering the passenger compartment.
  3. You notice a change in exhaust sound or unusual noise.
  4. The Nissan Sentra has been involved in an accident affecting the exhaust system, underbody, or rear structure.

Three-way catalyst

The three-way catalyst is an advanced emission control device installed within the exhaust system of the Nissan Sentra and plays a critical role in reducing harmful exhaust emissions.

Inside the three-way catalyst, exhaust gases are treated at very high temperatures, allowing chemical reactions to convert pollutants into less harmful substances before they are released into the atmosphere.

WARNING

• The exhaust gases and exhaust system components become extremely hot during operation. Keep people, animals, and all flammable materials well away from these components at all times.
• Never stop or park the Nissan Sentra over flammable materials such as dry grass, leaves, paper, or rags, as they may ignite and cause a fire.

CAUTION

• Do not use leaded gasoline. Lead deposits can permanently damage the three-way catalyst and significantly reduce its ability to control exhaust emissions.
• Maintain proper engine tuning at all times. Malfunctions in the ignition, fuel injection, or electrical systems can cause excess fuel to enter the three-way catalyst, leading to overheating and potential damage. If engine misfiring, reduced performance, or abnormal operation is detected, stop driving and have the vehicle inspected promptly.

  It is strongly recommended that you visit an authorized NISSAN dealer for inspection and service.

• Avoid driving with an extremely low fuel level. Running out of fuel may cause engine misfire, which can damage the three-way catalyst.
• Do not race the engine during warm-up, as this can overheat exhaust components.
• Never push or tow the Nissan Sentra to start the engine, as this may damage the emission control system.

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