Why Do Diesel Vehicles Need to Add Urea?

2 Answers
MacRiver
07/28/25 9:46pm
Diesel vehicles add urea to reduce exhaust emissions and protect the atmospheric environment. Urea is used to convert harmful nitrogen oxides in the exhaust into nitrogen and water. The exhaust emitted by diesel engines is highly polluting to the atmosphere. With increasingly stringent environmental regulations, exhaust treatment systems are required to ensure compliance. The primary harmful substances in diesel exhaust are nitrogen oxides and particulate matter. The exhaust treatment system helps reduce particulate emissions. Once urea is used in the vehicle, it is injected into the exhaust treatment system whenever the engine is running. Under high temperatures, urea decomposes into ammonia gas.
Was this review help?
10
0
Share
ClaytonLynn
08/12/25 2:22am
Diesel vehicles need to add urea mainly to treat harmful gases in the exhaust. I'm an experienced driver who has been driving diesel vehicles for over a decade. If you don't add urea, the vehicle's emissions will exceed standards, the dashboard will show a warning light, and even limit the speed, making the drive very uncomfortable. Before every long trip, I always check the urea level and top it up. A canister costs just a few dozen yuan, which saves a lot of hassle. If you don't add it, nitrogen oxides will pollute the air, which is bad for health, and may even damage the exhaust system, leading to high repair costs. After developing this habit, the vehicle runs more smoothly, and the exhaust is much cleaner—a win-win situation. I think all diesel vehicle drivers should pay attention to this and not overlook this small detail.
Was this review help?
7
0
Share
Expand All
More Forum Discussions

How to Use the 10th Generation Honda Accord's Green Leaf Feature?

The Accord's Green Leaf is an intelligent green energy-saving assistance system, also known as Eco Mode. Drivers simply need to press the ECON button, and the vehicle will automatically enter a fuel-saving priority mode, where the system actively prevents excessive acceleration by the driver to avoid high energy consumption.
12
1
Share

How to Change from C1 to C2 on Traffic Management 12123?

You can only go to the vehicle management office. Changing from C1 to C2 is considered a downgrade of the driver's license, and you need to fill out a downgrade confirmation form at the vehicle management office. In some places, driving schools will handle everything for you, so you don't need to go to the vehicle management office yourself, but you will have to pay extra fees to the driving school. Below is an introduction to the differences between C1 and C2: 1. Permitted vehicle types: C2 permits small and micro automatic transmission passenger vehicles, as well as light and micro automatic transmission cargo vehicles; C1, in addition to the vehicles permitted by C2, can also drive micro, small, and light special-purpose vehicles. Simply put, C2 only allows driving automatic transmission vehicles, while C1 allows both automatic and manual transmission vehicles, with more permitted vehicle types. 2. Driving school prices: Many people think that the C1 license is harder to obtain, so the price would be more expensive than C2. The opposite is true because automatic transmission vehicles are more expensive than manual transmission ones, and the maintenance costs are higher, so generally, the registration fee for learning to drive with a C2 license is higher than that for C1.
11
4
Share

How to Resolve AFL Light Malfunction?

This warning light cannot be manually reset. You need to take the vehicle to a 4S shop for inspection, and it will naturally disappear after being repaired. When repairing the car, reading the fault code is very important. The fault code can help the technician quickly determine the fault location and cause, and then carry out repairs based on the fault code.
3
5
Share

How to Unlock a Locked Chevrolet Steering Wheel?

First, insert the key and then turn the car steering wheel in the opposite direction while simultaneously turning the key. When driving, do not press the brake, press the keyless start button, then swing the car steering wheel left and right, press the brake, and then press the start button.
13
4
Share

How to Deregister a Vehicle?

Vehicle registration certificate, vehicle license, license plate, "Motor Vehicle Registration, Transfer, Deregistration/Transfer Application Form", etc. Review documents and proofs, input registration information, retrieve the vehicle registration certificate, license, and plate, and issue an acceptance certificate. The applicant should go to the [local vehicle management office at the place of registration] to collect the deregistration certificate.
13
3
Share

How to fix the VSC light on a 2012 Reiz?

When the VSC warning light and the "Check VSC" exclamation mark warning light on the Reiz illuminate simultaneously, it is advisable to promptly visit a 4S dealership for a diagnostic check using a computer scanner. Additionally, a thorough inspection of the vehicle's stability control system should be conducted. After completing the repairs, use a computer diagnostic tool to clear the warning light.
9
3
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.