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What Does a Permanent Fault Code Mean?

1 Answers
NevaehAnn
07/30/25 2:34am
Permanent fault codes refer to non-deletable error codes generated by a vehicle, which remain stored in the vehicle's system. Generally, these types of fault codes cannot be erased or rewritten. If a vehicle has permanent fault codes and needs them deleted or modified, it is necessary to contact the vehicle manufacturer and have professional technicians debug and rewrite the codes. The presence of permanent fault codes may affect the judgment of the vehicle's onboard computer. During driving, some commands might be misinterpreted, potentially leading to abnormal engine operation. The vehicle may experience shaking at idle, and the engine speed might fluctuate unpredictably.
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More Forum Discussions

What brand is the dedicated engine oil for Chevrolet?

Chevrolet manufacturers specify the use of 5W-30 engine oil. The original factory oil is a semi-synthetic oil configured with Shell technology. The number 5 represents the oil's low-temperature resistance - the smaller the number, the lower the low-temperature resistance. The number 30 indicates the oil's high-temperature resistance - the higher the number, the greater the high-temperature resistance. The W signifies that the oil can be used in winter. Steps for changing engine oil: Lift the vehicle, remove the protective plate, and place a container of about 10 liters under the oil drain screw; unscrew the drain screw, use an air gun to blow at the oil filler port for two minutes, tighten the drain screw after draining and wipe it with a tissue to check for leaks; reinstall the protective plate and lower the vehicle, then use a funnel to add oil at the filler port. Precautions when changing car engine oil: Perform the change while the engine is warm to ensure the old oil is drained as thoroughly as possible; replace the oil filter when changing the oil. The old oil filter can become clogged with impurities, which can slow oil flow and reduce engine lubrication. Residual old oil in the filter can degrade the quality of the new oil. Add oil and ensure the amount is appropriate; after adding oil, start the engine and check all components for leaks. Run the engine for 3 minutes to confirm the oil level reaches the normal mark.
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Is the Expressway Free During National Day?

During the National Day holiday, the expressway is free of charge. The vehicle types eligible for free passage are: passenger vehicles with 7 seats or fewer (including 7 seats) and motorcycles traveling on ordinary toll roads. The free toll period is determined by the time when the vehicle leaves the expressway exit toll lane, while for ordinary roads, it is based on the time when the vehicle passes through the toll station lane. During the free toll period for small passenger vehicles, toll stations will lift the barrier without issuing cards to allow passage. The ETC lanes remain operational during the free period, and small passenger vehicles equipped with ETC devices will not be charged, with the lane display showing a toll amount of zero. Therefore, ETC users are encouraged to use ETC lanes to avoid causing congestion at toll stations.
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What Does Lifetime Maintenance Mean When Buying a Car?

Lifetime maintenance when buying a car refers to free vehicle maintenance at the specific 4S shop. Below are relevant details: 1. Reason: 4S shops introduce lifetime maintenance to attract more customers, but in actual maintenance processes, it may not be entirely free. This is a common tactic used by many dealers to boost car sales. Typically, only basic oil and filter changes are included, while other maintenance items may incur additional charges. Pay attention to the fine print of lifetime maintenance offers. 2. Reminder: Due to car owners' lack of knowledge about parts, the oil used during maintenance may not be high-quality gasoline but lower-grade oil. Such oil may provide poor lubrication during use, potentially causing severe engine damage.
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Why does the Mercedes-Benz brake suddenly become very hard and difficult to press?

Here are the reasons why the Mercedes-Benz brake suddenly becomes very hard and difficult to press: 1. Related to pressing the brake before turning off the engine: The car's braking system works best when the engine is running, and the brake booster is the key component that amplifies the force applied to the pedal. When the engine is off, the brake booster stops functioning. Typically, pressing the brake pedal three times will exhaust its remaining vacuum force, making the brake feel very hard due to the lack of assistance. 2. Leakage or malfunction of the car's brake booster: If you haven't pressed the brake pedal after turning off the engine, the issue is likely caused by a malfunctioning brake booster. This could be due to a vacuum tube leak or blockage in the brake booster.
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Why do Mercedes-Benz ABS and ESP fail simultaneously?

Mercedes-Benz ABS and ESP failing simultaneously may be due to the failure of one or several wheel speed sensors in the Mercedes-Benz. Extended content: 1. ABS Anti-lock Braking System: When the car is braking, the system automatically controls the power of the brake based on its detection, preventing the wheels from locking up during high-speed driving. The wheels remain in a state of rolling and sliding, maximizing the adhesion between the car and the ground and preventing the phenomenon of wheel lock-up and rollover. 2. ESP Electronic Stability Program: It can enhance the car's handling and safety performance, preventing the car from losing control at dynamic limits. By analyzing information from various sensors on the car, it sends commands to ABS and EBD to help the car maintain dynamic balance.
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What is the normal height for high beams?

Normal high beam height is generally around 72cm. Here are the relevant details: 1. Avoid adjusting when possible: Under normal circumstances, it is not allowed to adjust the headlights without authorization. According to relevant automotive safety standards, manufacturers have already set the lights to the most suitable illumination range and height before leaving the factory. However, there may be some special circumstances, and it is recommended to have professionals or specialized equipment perform the adjustment. Do not attempt to adjust them yourself to avoid more serious consequences. 2. Adjustment range: Drive the vehicle to a safe location at night and manually adjust the switch to control the headlight's illumination range, width, height, etc. In terms of height, H1 should not exceed 62.5mm, H3 should not exceed 42mm, H4 should not exceed 92mm, and H7 should not exceed 59mm.
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