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 is the method to deactivate the anti-theft system in an older BMW 3 Series?

1 Answers
CorbinDella
07/30/25 6:35am
Leave the key in the ignition switch for half an hour, then use the original key to turn the ignition switch on and keep the key in the ignition position. The engine may start. The anti-theft code of the engine control unit matches the code on the anti-theft control module chip, so a code reading device can be used to retrieve its password. Locate a chip with the model number 93C86 on the original instrument cluster, perform cutting, and then swap these two chips between the old and new instrument panels. Measure the variable resistance value when the engine can start; this is the resistance value of the anti-theft key. Finally, connect a fixed resistor with the same resistance value to the feedback signal line to unlock it. You can repeatedly use the key to open and close the door mirrors (multiple turns may be required), which sometimes can deactivate the locked state.
Was this review help?
5
1
Share
More Forum Discussions

Should You Use 92 or 95 Octane Gasoline for Your Car?

The octane rating of gasoline for a car should generally follow the recommendations in the vehicle's official owner's manual. In addition to checking the appropriate octane rating in the owner's manual, you can also find this information on the fuel tank cap, which typically indicates the recommended rating. The octane rating can also be determined based on the engine's compression ratio. Cars with a compression ratio between 8.6-9.9 should use 92 octane gasoline, while those with a compression ratio between 10.0-11.5 should use 95 octane gasoline. For higher compression ratios, 98 octane gasoline is recommended. However, with the use of new technologies, the compression ratio alone may not be the sole determinant of the appropriate octane rating. High compression ratio engines can sometimes be tuned to use lower octane gasoline. Other factors, such as ignition timing, turbocharging technology, and Atkinson cycle technology, also play a role. Generally, the higher the octane rating, the higher the octane number and the better the anti-knock performance. 92 octane gasoline contains 92% isooctane and 8% n-heptane, while 95 octane gasoline contains 95% isooctane and 5% n-heptane. Occasionally using the wrong octane rating is not a problem—simply switch back to the correct rating after the tank is empty. However, prolonged use of the wrong octane rating can have the following effects: For vehicles designed for lower octane gasoline, using a higher octane rating will not cause damage. However, the increased octane number can alter the fuel's ignition point, leading to delayed combustion in the engine. This reduces the engine's power output and thermal efficiency, resulting in poorer performance. For vehicles designed for higher octane gasoline, using a lower octane rating can cause engine knocking. Because the octane number is significantly lower, the fuel's ignition point decreases, causing premature ignition during the compression stroke. If the fuel ignites before the spark plug fires, it creates resistance during the upward stroke. This resistance makes the engine run very unevenly. Mild knocking may only increase noise without noticeable engine damage, but severe knocking indicates serious engine issues. The vibrations not only affect driving stability but can also cause abnormal wear on the pistons and cylinders, potentially leading to severe damage like cylinder scoring.
17
5
Share

What does it mean when the ABS light appears on the car dashboard?

The appearance of ABS on the car dashboard refers to the Anti-lock Braking System. If the ABS system malfunctions and stops working, the car will behave as if it does not have an ABS system, resulting in reduced braking effectiveness, increased braking distance, and poorer handling performance during braking. Therefore, when the ABS light comes on, the fault should be addressed promptly. The function of the ABS system is to improve the safety factor of emergency braking while driving. Reasons for the ABS light appearing on the car dashboard: 1. Faulty wheel speed sensor; 2. ABS wiring fault; 3. ABS pump or pressure regulating solenoid valve fault; 4. ABS computer fault.
17
3
Share

Is the Lynk & Co 03 a domestic car or a joint venture car?

Lynk & Co 03 is a domestic car. Lynk & Co is an automotive brand jointly established by Geely Holding Group, Geely Auto Group, and Volvo Cars. The Lynk & Co 03 has a body length of 4639mm, a width of 1840mm, and a height of 1460mm, with a wheelbase of 2730mm. It is equipped with a 1.5-liter turbocharged engine and a 2.0-liter turbocharged engine, featuring front-wheel drive. The Lynk & Co 03's 1.5TD high-efficiency engine from the Drive-E series begins turbo intervention at 1000rpm, delivering 150 Nm of torque. At 1500rpm, the engine reaches its maximum torque of 265 Nm, with quick turbo response and fast low-speed reaction, making hill climbing and overtaking easier. It comes with features such as Lane Keeping Assist System, Adaptive Cruise Control, Auto Hold, Panoramic Sunroof, Remote Start, Digital Instrument Panel, and Vehicle Connectivity.
20
2
Share

Does Running the Air Conditioner While the Engine Is Off Damage the Car?

Running the air conditioner while the engine is off can damage the car for the following reasons: 1. If the air conditioner is not turned off before shutting down the engine, the compressor will start simultaneously during the next ignition, increasing the load on the motor; 2. Using the air conditioner when the engine is cold can harm the engine; 3. Turning off the air conditioner about 2 minutes before shutting down the engine allows the cold air in the ducts to be discharged in time, preventing mold and bacterial growth. Car air conditioners have two modes: internal and external circulation. In external circulation mode, a fan draws air from outside the car into the interior, meaning there is an airflow channel between the outside and inside of the car. Even if the fan is not turned on, air will still flow into the car while driving, replenishing fresh air inside. In internal circulation mode, the airflow channel between the inside and outside of the car is closed. Without the fan, there is no airflow circulation. When the fan is on, the air drawn in comes only from inside the car, effectively preventing external dust and harmful gases from entering the car.
20
0
Share

What engine does the Accord 2.0 have?

Accord 2.0 is equipped with an IVtec engine and adopts a CVT transmission. Its body dimensions are 4930mm in length, 1845mm in width, and 1470mm in height, with a wheelbase of 2775mm. The vehicle weighs 1660 kilograms, features front-wheel drive, and has a top speed of 200 kilometers per hour. The IVtec engine used in the Accord 2.0 combines Honda's Variable Valve Timing and Lift Electronic Control (VTEC) technology with the Variable Timing Control (VTC) technology that continuously adjusts the valve timing across different engine speed ranges, delivering substantial torque output and acceleration performance. Through the ECU (Electronic Control Unit), it controls the opening and closing of the intake and exhaust valves, maintaining the engine's combustion state at its optimal level, thereby achieving high power output, low fuel consumption, and clean emissions.
17
5
Share

Where are the accelerator and brake in an automatic transmission car?

In an automatic transmission car, the accelerator and brake are located below the driver's console. The brake is on the left, and the accelerator is on the right, both controlled by the right foot. Placing the accelerator and brake together assumes that the driver will only use the right foot to control either the accelerator or the brake at any given time, allowing the car to either accelerate or decelerate. The main design purposes are: 1. The accelerator is used more frequently and is positioned on the outer side of the right foot for a more comfortable posture; 2. The brake is placed on the inner side of the right foot, with the brake pedal slightly higher than the accelerator pedal to facilitate quick reaction from the driver. The correct operation method involves pivoting the right heel and using the ball of the foot to press the pedals; 3. In manual transmission cars, the driver uses both legs to control three pedals, making it impossible to press the brake and accelerator simultaneously. If accidental simultaneous pressing occurs, the vehicle's electronic system and ECU will prioritize the brake by default.
5
5
Share
Trending Ranking
What to Do If the Solenoid Valve of a New Volkswagen Sagitar Fails?
Patching or Replacing a Tire with a Nail Puncture?
How to Downshift and Overtake with a CVT?
4
Why is the car noise particularly loud?
5
How Long Does It Take to Charge a New Energy Vehicle?
6
How to Distinguish Between China IV and China V Vehicles?
7
How Many Months Does a Car Need to Be Considered as Stock Vehicle?
8
What Does Commercial Auto Insurance Cover?
9
What is the fuel consumption of the Trumpchi GS4?
10
What Causes a Motorcycle to Lack Power When Climbing a Slope?
More Forum Discussions

Can Gasoline from Different Gas Stations Be Mixed?

19
0
1

What does metallic paint mean for cars?

10
2
1

Where is the cigarette lighter fuse of the Lavida located?

16
3
1

What Causes the Central Brake Light to Malfunction?

15
1
1
About Us
Terms of Use
Privacy Policy
Help
Contact Us
FAQ
Cookie
Cookie Policy
Cookie Settings
© 2025 Servanan International Pte. Ltd.