···
Log in / Register

What Could Be the Reason for the Malfunction Indicator Light Staying On While the Car Runs Normally?

4 Answers
OGavin
07/29/25 9:52pm

It could be due to a damaged sensor. Reason: If the sensor is damaged, it may transmit incorrect signals, which can also trigger the malfunction indicator light. If this is the cause, simply replacing the sensor should resolve the issue. If the sensor is confirmed to be functioning properly, the cause of the exhaust emission problem is mostly due to carbon buildup, and the vehicle's carbon buildup may be quite severe. Precautions: This is related to both usual driving habits and the type of fuel used. If unsuitable or poor-quality gasoline is used, it may not burn completely, leading to carbon buildup.

Was this review help?
10
1
Share
AbelAnn
08/15/25 9:32pm

I think this is quite a common issue, and I encountered a similar situation last time. The warning light is on, but the car drives perfectly fine. This is often due to a faulty sensor, such as an oxygen sensor or temperature sensor, which might be dirty or poorly positioned, sending incorrect signals to the computer. It could also be because the battery voltage is slightly low but not completely dead, so the car still runs normally. I’ve also heard that some cars experience this due to software glitches, where the system is overly sensitive and falsely reports an error. In any case, this shouldn’t be taken lightly, as it might hide underlying issues, such as increased fuel consumption or potential breakdowns in the future. Back then, I took my car to a nearby repair shop and used a diagnostic tool to scan the error codes. It turned out to be just a minor fault, and the light went off after clearing it. I recommend you get it checked as soon as possible to avoid compromising driving safety.

Was this review help?
8
2
Share
Expand All
ArabellaLynn
10/17/25 6:21am

As a parent who frequently drives my kids to school, I'm most concerned about situations where the warning light is on but nothing seems wrong. A lit warning light indicates the electronic system has detected an abnormality, which could be a malfunctioning emissions-related sensor or a minor computer glitch. If the car feels normal to drive, it might be an intermittent issue that hasn't worsened yet, like engine misfires. Don't forget this could affect your vehicle's long-term health, potentially increasing fuel consumption or causing excessive emissions. I had a friend who ignored this issue and ended up with major engine repairs later. Now I've developed the habit of stopping to check or visiting a professional shop whenever a warning light stays on - safety comes first, especially when family members are in the car.

Was this review help?
1
5
Share
Expand All
VonMiranda
11/30/25 7:04am

I have some knowledge about automotive technology and found that when the warning light stays on but the car seems fine, it's mostly minor issues with the electronic system. Common causes include OBD sensors reporting false error codes or loose circuit connections causing false alarms. Some newer cars may also experience this if their software isn't updated in time. I enjoy DIY solutions, so I bought a diagnostic tool for about 20-30 yuan, plug it into the car, and within minutes I can read the trouble codes and refer to the manual to fix minor issues myself. Of course, if it involves safety components like ABS, it's better to consult a professional. Don't ignore these problems, as they might turn from false warnings into real faults, affecting daily commutes or emission tests.

Was this review help?
5
0
Share
Expand All
More Forum Discussions

What is the real reputation of Geely Borui after three years?

Geely Borui has relatively high fuel consumption, powerful engine performance, strong acceleration, beautiful appearance, good interior craftsmanship, high cost-performance ratio, and rich configurations. Geely Borui exterior design: The Borui GE has undergone optimized designs on multiple parts such as the grille and front/rear bumpers, making the overall shape more dynamic and stylish. The optimized water ripple grille is more square and more imposing. The lower grille design has been updated from the original ribbon style to a blade style, with the addition of a horizontal chrome trim, giving the front face more layers and a three-dimensional feel. Geely Borui interior design: The Borui GE adopts a "Starship Cockpit" design, with the interior largely wrapped in soft plastic materials. The center console is outlined with "V" shaped lines and innovatively integrates the instrument panel, central control screen, and co-pilot console into one, presenting an IMAX-like visual effect. Additionally, the dual 12.3-inch central control LCD screen and full LCD instrument panel, the sci-fi atmosphere lighting of the "Time Tunnel," intelligent voice control, piano key-style air conditioning control buttons, the floating feeling of the horizontally designed gear lever, and the driving mode knob crafted with micron-level precision all showcase Geely Borui's pursuit of premium luxury quality and spiritual experience.
16
2
Share

How to Cancel the Tire Pressure Warning Light on Volkswagen?

Method to reset the tire pressure warning on Volkswagen Sagitar: First, turn on the ignition switch, then press and hold the tire pressure monitoring reset button. After hearing a "beep" sound, release the button. The tire pressure monitoring system will store the current normal tire pressure data, automatically clear the previous data, and finally, the warning light on the dashboard will turn off, completing the tire pressure reset. There are three commonly used methods for tire pressure monitoring: Direct Tire Pressure Monitoring: Direct tire pressure monitoring devices use pressure sensors installed in each tire to directly measure the tire pressure. The pressure information is transmitted wirelessly from inside the tire to a central receiver module, which then displays the tire pressure data for each tire. Indirect Tire Pressure Monitoring: When the pressure in a tire decreases, the vehicle's weight causes the rolling radius of that tire to become smaller, resulting in a faster rotation speed compared to the other wheels. By comparing the differences in rotation speeds between the tires, the system monitors the tire pressure. Introduction to Tire Pressure Monitoring System (TPMS): It combines the advantages of both systems mentioned above. Direct sensors are installed in two diagonally opposite tires, and a four-wheel indirect system is also equipped.
3
1
Share

What are the dimensions of the A7L?

Audi A7L dimensions are 4976mm in length, 1908mm in width, and 1405mm in height, with a wheelbase of 2928mm. A7L interior features: Two high-definition touchscreens measuring 10.1 inches and 8.6 inches enable numerous entertainment and convenience operations, providing feedback through tactile and auditory sensations to create a more convenient and avant-garde digital cockpit. A 12.3-inch high-resolution TFT screen is positioned directly in the driver's line of sight, displaying multiple driving information in a simple, easy-to-understand, and clear layout. A7L powertrain specifications: The A7L is equipped with a 3.0TFSI V6 engine, delivering a maximum output of 250kW and a robust torque of 500Nm, achieving 0-100km/h acceleration in approximately 5.6 seconds while ensuring high fuel efficiency and low emissions. It features the latest generation quattro intelligent all-wheel-drive system, which adaptively distributes torque between the front and rear axles according to different scenarios, enabling predictive and rapid response for all-wheel-drive mode switching. The active air suspension also adapts to various road conditions. Additionally, the 48V mild hybrid system provides comprehensive electrification support, offering energy recovery during braking for use in acceleration, resulting in more powerful performance, enhanced ride comfort, and a more elegant and composed driving experience.
17
2
Share

How to Remove the Wiper Blades on an Audi A4?

Audi A4 wiper blade removal method is as follows: 1. First, lift the metal wiper arm of the FAW-Volkswagen Audi A4 vehicle off the windshield, then stand the wiper upright, ensuring it remains stable. 2. Locate the plastic tab securing the rubber wiper blade to the metal arm. Press the tab to release and remove the old wiper blade from the Audi vehicle. 3. Additional Information: The wiper blade is a device used to sweep away rain and dust attached to the vehicle's windshield, improving driver visibility and enhancing driving safety.
16
1
Share

When will the China 6 emission standard be implemented in Hunan?

Hunan will implement the China 6 emission standard from July 1, 2019, in accordance with the national unified deployment. The country divides the "China 6 emission standard" into two phases: "China 6A" and "China 6B". China 6A is a transitional phase from China 5 to China 6, with lower emission requirements for carbon monoxide, non-methane hydrocarbons, nitrogen oxides, and PM particulate matter compared to China 6B. Below are the official implementation dates for the two China 6 standards: 1. The official implementation date for China 6A standard is July 1, 2020. 2. The official implementation date for China 6B standard is July 1, 2023.
18
0
Share

What causes the roof noise in Roewe RX5?

The main reasons for the roof noise in Roewe RX5 are as follows: 1. Loose fixing clips on the car roof, which require inspection and re-fixation: The interior panels of the car are mostly fixed to the body with clips. When the clips become loose, the interior panels will make noise. To solve the noise issue, it is necessary to accurately locate the source of the noise and then reinforce or replace the clips in the affected area. 2. Poorly secured wiring inside the car roof, causing noise: The roof needs to be dismantled for repair. Additionally, the Roewe RX5 adopts the brand's signature Rhythm design language, featuring a large front grille and decorative chrome trim.
13
1
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.