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What are the reasons for frequent failure of car oxygen sensors?

2 Answers

LaDavid

07/24/25 7:11am

The reasons for frequent failure of car oxygen sensors are: 1. Poor fuel quality; 2. Spark plug failure; 3. Three-way catalytic converter issues. The working principle of the oxygen sensor is: using a ceramic sensitive element to measure the oxygen potential in the heating furnace or exhaust pipe, calculating the corresponding oxygen concentration based on the chemical equilibrium principle, thereby monitoring and controlling the air-fuel ratio of combustion in the furnace to ensure product quality and meet exhaust emission standards. The function of the oxygen sensor is: to control the amount of car exhaust emissions, effectively reducing the environmental pollution caused by cars. The detection method for the oxygen sensor is: 1. Unplug the oxygen sensor connector; 2. Use a multimeter in resistance mode to measure the resistance value between pins 1 and 2 of the sensor; 3. A resistance value between 4 and 40 is normal, and if the resistance value is abnormal, the oxygen sensor should be replaced.

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McCamilla

08/11/25 2:57am

I've encountered many cases of faulty oxygen sensors in cars, and several main causes are quite common. For example, engine leaks where oil or coolant sneaks into the exhaust system and coats the sensor, causing it to malfunction—this is more prominent in older cars. Poor fuel quality is another culprit; low-grade gasoline with many impurities leaves carbon deposits after combustion, which adhere to sensitive parts. Circuit aging is common in hot engine compartments, where wires harden and crack, and connectors rust, leading to poor contact and erratic sensor signals. Driving habits also play a role, such as prolonged idling or frequent short trips with constant stop-starts, which allow condensation to corrode components. Regular checks for engine sealing, using high-quality gasoline, taking long drives to fully warm up the system, and choosing reliable replacement parts can significantly reduce issues. Otherwise, fuel consumption increases and exhaust treatment is affected.

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Should You Shift to Neutral When Waiting in Subject 2 Parking?

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Should the clutch be pressed continuously when waiting at a red light in Subject 3?

During the Subject 3 exam, when stopping at a red light, you can directly press the clutch and brake, then shift into first gear without pulling the handbrake. The following is an extended introduction: The content of the Subject 3 road driving skills test includes: preparation for large buses, tractors, city buses, medium-sized buses, large trucks, small cars, small automatic transmission cars, low-speed trucks, and small automatic transmission cars for the disabled, simulated nighttime lighting test, passing pedestrian crossings, passing school zones, and nighttime driving; the test content for other permitted vehicle types is determined by the provincial public security traffic management department. Test mileage: large buses and medium-sized buses must cover at least 20 kilometers, including at least 10 kilometers during the day and 5 kilometers at night. Tractors, city buses, and large trucks must cover at least 10 kilometers, including at least 5 kilometers during the day and 3 kilometers at night.

Can I familiarize myself with the test site before the Subject 2 driving test?

Many test sites now allow candidates to familiarize themselves with the venue before the Subject 2 driving test, usually before the test begins or after it concludes. It is highly recommended that candidates who have the opportunity should get acquainted with the test site in advance. Familiarizing yourself with the site not only helps alleviate nervousness about the unfamiliar environment but also aids in adapting to the test site's variations beforehand. Below is an extended introduction: Things to Note: Memorize the Test Routes: Typically, there are about 3 test routes, and the reference points on each route may vary. Therefore, it is essential to memorize these routes during the practice session the day before the test. Get Familiar with the Test Vehicle: During regular practice sessions, candidates usually use training vehicles, which may differ from the actual test vehicles. The pre-test practice at the test site provides an excellent opportunity to become familiar with the test vehicle.

Is there a time limit for the S-curve in Subject 2?

There is no time limit for the S-curve in Subject 2. As long as you maintain a normal speed during the curve driving and avoid stopping midway, there's no need to worry about the time. The key is to master the driving techniques. Here is an extended introduction: Precautions: In curve driving, the size of the wheel difference is related to the steering angle of the car and the length of the wheelbase. The larger the steering angle or the longer the wheelbase, the greater the difference between the inner and outer wheels. For small cars, the inner wheel difference is about 0.8-0.9 meters, and the outer wheel difference is about 0.7 meters. The size of the inner wheel difference depends on the steering angle and the length of the wheelbase. The larger the steering angle, the greater the inner wheel difference, and vice versa; the longer the wheelbase, the greater the inner wheel difference, and vice versa.

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