Browse
For Sale
Antiques CollectiblesApparelBaby Kids ItemsBooks， Movies And MusicElectronicsFree StuffGarden OutdoorHealth BeautyHome GoodsHome Improvement SuppliesMusical InstrumentsOffice SuppliesPet SuppliesSporting GoodsTicketToys GamesTransportationOthers
Jobs
AccountingAdministration & Office SupportAdvertising， Arts & MediaBanking & Financial ServicesCall Center & Customer ServiceCEO & General ManagementCommunity Services & DevelopmentConstructionConsulting & StrategyDesign & ArchitectureEducation & TrainingEngineeringFarming， Animals & ConservationGovernment & DefenseHealthcare & MedicalHospitality & TourismHuman Resources & RecruitmentInformation & Communication TechnologyInsuranceLegalManufacturing， Transport & LogisticsMarketing & CommunicationsMining， Resources & EnergyReal Estate & PropertyRetail & Consumer ProductsSalesScience & TechnologySelf EmploymentSport & RecreationTrades & ServicesOther
Property
BuyRent
Cars
Used CarsNew CarsOthers
Services
BusinessCraftsDesign And WebEventsHome ImprovementLegalLessonsPersonalPetsPhotographyRepair And Technical SupportWellnessWriting， Translation， And TranscriptionOthers
Community
Activities & GroupsArtists & MusiciansClasses & LessonsEventsFriendship & NetworkingLost & FoundRideshareSports TeamsVolunteersTravel & Travel PartnersSkills & Language SwapOther

What Are the Symptoms of a Faulty Oxygen Sensor?

2 Answers
StIsla
07/28/25 4:49pm
If the oxygen sensor is faulty, the engine malfunction indicator light will typically illuminate. Below are the symptoms of a faulty oxygen sensor: 1. Increased fuel consumption, as carbon buildup on the oxygen sensor can lead to abnormal signal output, causing an imbalance in the engine's air-fuel mixture ratio and higher fuel consumption. 2. Increased pollutant emissions, resulting in a failed annual vehicle inspection due to excessive exhaust emissions. Although the three-way catalytic converter can purify exhaust gases, its capacity is limited. If the oxygen sensor malfunctions, it can cause incomplete combustion in the engine, leading to higher pollutant emissions. Even if the catalytic converter is functioning properly, it may not be able to compensate. Therefore, if an older vehicle fails the emissions test during inspection, in addition to cleaning the catalytic converter, cleaning or replacing the oxygen sensor should also be considered. 3. Black smoke from the exhaust may indicate abnormal oxygen sensor operation, disrupting the air-fuel ratio and causing black smoke. 4. Unstable engine RPM and shaking can also result from an abnormal air-fuel mixture ratio.
Was this review help?
7
5
Share
BarrettMarie
08/11/25 11:28pm
Oh no, last time my car had issues it was because the oxygen sensor failed. At first the engine warning light kept staying on, and only after taking it to the shop did we find out the reason. Then the fuel consumption started skyrocketing - used to get 500km per tank, now it's barely over 400km, really hurts the wallet! The car kept shaking while driving, especially when idling at red lights, felt like my whole body was vibrating. The worst part was the terrible exhaust smell like rotten eggs - my friends would all frown when riding in my car. Looked it up and found this sensor controls the air-fuel ratio. When it fails, the mixture gets messed up, causing incomplete combustion and accelerating engine wear. If not fixed promptly, it could lead to more serious engine failures with much higher repair costs.
Was this review help?
10
3
Share
Expand All
More Forum Discussions

Does the fuel gauge E indicate full or empty?

In a car's fuel gauge, F stands for full, and E indicates low fuel level. For an analog fuel gauge, when the needle points to F, it means the fuel tank is full. The closer the needle is to E, the lower the fuel level, meaning there is less fuel. F represents full, which is short for "FULL". The F on a car's fuel gauge stands for FULL in English, indicating a full tank, while E stands for Empty, meaning low fuel. Precautions for refueling a car: Avoid overfilling: If the tank is filled too much, the high summer temperatures and the heat generated by the car itself can cause the fuel to expand. To prevent the fuel tank from rupturing due to the expansion of fuel volume, there is a vent hole on top. If the tank is overfilled, fuel may overflow through the vent hole, which could lead to spontaneous combustion if exposed to an open flame, with potentially disastrous consequences. Additionally, fuel overflowing through the vent hole may drip onto the car body, causing some corrosion. Try to avoid waiting until the fuel light comes on to refuel: While driving, always pay attention to the fuel gauge. When the needle indicates only a quarter of the fuel is left, it's time to refuel. It's best not to wait until the fuel light comes on before refueling. Modern cars use electric fuel pumps that rely on fuel for lubrication and cooling. Frequently waiting until the fuel light comes on to refuel can prevent the fuel pump from getting proper lubrication and cooling, ultimately reducing its lifespan. Choose the right time to refuel: Avoid refueling at midday. Due to thermal expansion and contraction, the volume of fuel increases with rising temperatures and decreases when temperatures drop. Since fuel is sold by volume, to save money, it's better to refuel in the early morning or evening.
12
2
Share

Which cities do not allow registration of China 5 vehicles?

China 5 vehicles cannot be registered in the following cities: Beijing, Tianjin, Hebei, Shandong, Shanxi, Henan, Guangzhou, Shenzhen, and Hainan. More details are as follows: 1. The China 6 standard is extremely stringent, with a significant gap between it and the China 5 standard. Its requirements far exceed the Euro 6 emission standards and the U.S. Tier 3 standards, making it one of the strictest emission standards globally. 2. Therefore, the implementation period for the China 6 standard will be quite long. The corresponding high standards impose high technical requirements, leading to increased costs for China 6-compliant vehicles. Due to higher demands on fuel consumption and power, automakers naturally need to invest more money, manpower, and resources in engine development. 3. Many people want to purchase China 5 vehicles before the registration deadline arrives, as there are currently significant discounts on new China 5 vehicles. However, vehicles purchased in regions with the 'China 5' emission standard cannot be transferred to regions with the 'China 6' standard, reducing the efficiency of the used car market and affecting prices, which in turn lowers the vehicle's resale value.
8
5
Share

What is the principle of the built-in tire pressure monitoring?

Built-in tire pressure monitoring in cars can be divided into two types: direct tire pressure monitoring and indirect tire pressure monitoring. The difference lies in that direct monitoring can display specific tire pressure values, while indirect monitoring only alerts when there is a problem with the tire pressure. Below is an introduction to the two types of tire pressure monitoring: 1. Direct tire pressure monitoring uses pressure sensors to directly measure tire pressure: The direct tire pressure monitoring device uses pressure sensors installed in each tire to directly measure the tire pressure. It then sends the pressure information from inside the tire to a central receiver module via a wireless transmitter, displaying the tire pressure data for each tire. When the tire pressure is too low or there is a leak, the system will automatically alert; 2. Indirect tire pressure monitoring detects when a tire's pressure drops, causing its rolling radius to decrease and its rotation speed to become faster than other wheels: The working principle of indirect tire pressure monitoring is that when the pressure of a tire decreases, the vehicle's weight causes the rolling radius of that wheel to become smaller, resulting in its rotation speed being faster than other wheels. By comparing the differences in rotation speeds between tires, the system monitors the tire pressure. The indirect tire pressure alert system essentially relies on calculating the rolling radius of the tires to monitor the pressure.
6
5
Share

How often does a new 7-seater vehicle need an inspection?

New vehicles require an inspection in the sixth year. Below is more information about vehicle inspections: Specific inspection content: Check whether the engine, chassis, body, and their attachments are clean, complete, and functional; whether the paint surface is uniform and aesthetically pleasing; whether major assemblies have been replaced and match the initial inspection records; verify if the vehicle's braking performance, steering control, lights, exhaust, and other safety features comply with the technical requirements for safe operation of motor vehicles; check if the vehicle has been modified, remodeled, or altered, and whether the registration details on the driving license, license plate, and vehicle records match the current condition of the vehicle, including any changes or necessary approvals and modifications; inspect the license plate, driving license, and the enlarged license plate print on the vehicle for damage, tampering, illegible characters, or if replacement is needed. Notes on vehicle inspections: Vehicles must undergo an inspection within three months before the expiration of the current inspection period. According to relevant laws, the owner of the vehicle must resolve all traffic violations and accidents related to the vehicle before following the legal process to apply for the annual inspection.
15
0
Share

When did the National VI emission standard take effect in Chengdu?

Chengdu implemented the National VI emission standard on July 1, 2019. The State Council announced that key regions, the Pearl River Delta region, and the Chengdu-Chongqing region would implement the National VI standard on July 1, 2019, while other regions would implement it from July 1, 2020. More details are as follows: 1. Article 4, Section 15 of the "Three-Year Action Plan for Winning the Blue Sky Defense Battle" issued by the State Council clearly stipulates that the National VI emission standard would be implemented in advance in key regions, the Pearl River Delta region, and the Chengdu-Chongqing region starting from July 1, 2019. The promotion and use of gas vehicles meeting the National VI emission standard were encouraged. 2. Fifteen provinces and municipalities across the country successively issued documents to implement the National VI emission standard in advance in 2019, meaning that only vehicles meeting the National VI standard could be registered starting from July 1, 2019. 3. After the implementation of the National VI emission standard, all vehicles sold and registered must meet the requirements of the National VI standard. Vehicles below this emission standard will be prohibited from being sold, registered, or transferred. National IV and National V emission vehicles can only be scrapped or relocated to regions where the National VI standard has not yet been implemented.
4
4
Share

What is the minimum ground clearance of the Beijing Hyundai Fista?

The minimum ground clearance of the Beijing Hyundai Fista is 150 millimeters. The minimum ground clearance of the Beijing Hyundai Fista refers to the distance between the lowest point (excluding the wheels) and the supporting plane, which indicates the vehicle's ability to pass over obstacles such as rocks and tree stumps without collision. If the Beijing Hyundai Fista has a higher ground clearance, its off-road capability improves. However, if the ground clearance is too high, the stability at high speeds may decrease. The Beijing Hyundai Fista is a compact car under the Beijing Hyundai brand, featuring a 4-door, 5-seat sedan body structure. The dimensions of the Beijing Hyundai Fista are 4660 millimeters in length, 1790 millimeters in width, and 1425 millimeters in height, with a wheelbase of 2700 millimeters. Generally, the ground clearance of sedans ranges between 110 millimeters and 150 millimeters, while SUVs have a ground clearance between 200 millimeters and 250 millimeters. However, the ground clearance of the Beijing Hyundai Fista is not static; it also depends on the load condition. Therefore, changes in ground clearance should be considered based on the load variations of the Beijing Hyundai Fista. When selecting a vehicle, ground clearance can be one of the reference factors. The choice should depend on the vehicle's intended use and the road conditions. For urban areas with well-maintained roads, vehicles with lower ground clearance can enhance stability and comfort. For long-distance travel or driving in areas with poor road conditions, vehicles with higher ground clearance are preferable to avoid damage to the chassis.
6
4
Share
Trending Ranking
What should you pay attention to when driving in heavy rain?
What Causes the Engine to Sound Louder When Driving in Winter?
What is the fuel injection method of the Infiniti Q50L engine?
4
How can beginners judge the distance of the car body?
5
What grade of gasoline should a Polo use?
6
How to Measure the Condition of a Compressor?
7
Is Maintenance Required When the Time Comes Even If the Mileage Hasn't Been Reached?
8
What is an Imported Car?
9
Can You Still Drive If the Transmission Valve Body Is Broken?
10
How to Use the Hands-Free Trunk?
More Forum Discussions

What is the difference between displacement with and without a T

4
5
0

What are the causes of tire wear?

16
4
0

What is the Purpose of a Car's Quarter Window?

19
4
0

What is the difference between 5w and 10w?

6
4
0
About Us
Terms of Use
Privacy Policy
Help
Contact Us
FAQ
Cookie
Cookie Policy
Cookie Settings
© 2025 Servanan International Pte. Ltd.