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• 106.

  What happens if the steering angle sensor is not reset?

  Steering Angle Sensors (SAS) are critical components in modern vehicles, especially those equipped with advanced safety systems such as Electronic Stability Control (ESC) and Lane Departure Warning (LDW). If the steering angle sensor is not properly reset after certain maintenance procedures, it can cause several potential problems:
  ① Improper operation of safety systems: SAS provides critical data to safety systems such as ESC and LDW. If the sensors are not reset correctly, these systems may not operate properly or may even fail completely. This may compromise the stability and safety of the vehicle.
  ② Steering Assist Error: Some vehicles use an Electric Power Steering (EPS) system that adjusts steering assistance based on readings from a steering angle sensor. If the sensor is not reset, EPS may provide an incorrect level of assistance, affecting the driver's steering experience.
  ③ Malfunction Indicator Lamp (MIL) Activated: Failure to reset the steering angle sensor may trigger a fault code in the vehicle's onboard diagnostic system, causing the Malfunction Indicator Lamp (MIL) on the instrument panel to illuminate. This indicates a problem with the steering angle sensor or related systems.
  ④ Lost Calibration: The steering angle sensor requires calibration to ensure accurate readings. If not reset correctly, the sensor may lose calibration, resulting in inaccurate steering angle measurements. This may affect the proper operation of various vehicle systems that rely on this data.
  ⑤ Vehicle alignment issues: In some cases, improper resetting of the steering angle sensor can affect vehicle alignment, leading to uneven tire wear, steering pull, or handling issues.
  In summary, failure to reset the steering angle sensor can have a variety of negative consequences, including compromised safety systems, steering assist errors, MIL activation, lost calibration, and alignment issues. When performing maintenance tasks involving the steering angle sensor, it is important to follow the manufacturer's recommendations and procedures to ensure proper operation and safety.
  
• 107.

  Is rev matching good or bad?

  Rev matching is generally considered good practice, especially in high-performance driving situations where smoothness and control are critical. Rev matching involves mashing the accelerator to match engine speed to wheel speed before downshifting, which helps to smoothly engage lower gears without upsetting the car's balance. This technology reduces wear on clutch and transmission components, improves stability during deceleration, and enhances the overall driving experience. However, as with any driving technique, rev matching should be done correctly and within safe and legal limits.
• 108.

  Does bubbling coolant always mean blown head gasket?

  Coolant foaming can be a symptom of a variety of problems within the cooling system, and while a bad head gasket is one potential cause, it's not the only one. Here are a few reasons why coolant may be foaming:
  ① Air pockets: If air pockets exist in the cooling system, they can cause blistering as the coolant circulates and displaces the air.
  ② Normal operation: It is normal for a small amount of bubbles to appear in the coolant reservoir or overflow tank in some cases, especially when the engine is first started or shut down. This is usually caused by the coolant expanding and contracting as it heats and cools.
  ③ Coolant overflow: If the coolant level in the reservoir is too high, the coolant may overflow and produce bubbles when the engine heats up.
  ④ Leaking cylinder head gasket: A damaged cylinder head gasket can cause combustion gases to escape into the cooling system, causing coolant foaming. Other symptoms of a damaged cylinder head gasket may include white exhaust smoke, loss of coolant (without external leaks), and engine overheating.
  ⑤ Cracked cylinder head: A cracked cylinder head can also allow combustion gases to enter the cooling system, causing coolant foaming.
  ⑥ Coolant leak: Leaks in the cooling system (such as leaks in the radiator hose, water pump, or radiator) can introduce air into the system and cause bubbling.
  If you notice coolant bubbling, you must investigate the issue further to determine the root cause. This may involve checking for other symptoms of a bad head gasket, pressure testing the cooling system to check for leaks, and ensuring the coolant level is proper and the system is bled of air. If you suspect a bad head gasket or other serious problem, it's best to have the vehicle inspected by a qualified mechanic to prevent further damage.
  
• 109.

  Will air work itself out of coolant system?

  Air can sometimes become trapped in your vehicle's cooling system, especially after maintenance has been performed, such as replacing the coolant, hoses, or radiator components. While some air may naturally bleed from the system over time during normal operation, it is often necessary to bleed the cooling system to ensure all air pockets are cleared.
  Here are a few reasons why removing air from your cooling system is important:
  ① Efficient Cooling: Air pockets interfere with the flow of coolant through the system, causing local hot spots and inefficient cooling. This can cause the engine to overheat and possibly cause damage.
  ② Air lock prevention: Air pockets can form air locks in the cooling system, preventing the coolant from circulating properly and causing unstable temperature fluctuations.
  ③ Prevent corrosion: Air trapped in the system can cause corrosion of metal parts due to the presence of oxygen. This can lead to premature wear and damage to the cooling system.
  
• 110.

  Will a bad fuel sensor throw a code?

  Yes, a malfunctioning air-fuel sensor (also called an oxygen sensor or A/F sensor) can trigger a diagnostic trouble code (DTC) and illuminate the check engine light on your vehicle's dashboard. The specific codes associated with the air-fuel sensor will vary depending on the make and model of your vehicle.
  When the Engine Control Module (ECM) detects a problem with the performance or output of the air-fuel sensor, it will store the appropriate fault code and illuminate the Check Engine Light to alert the driver to the problem. If you notice the Check Engine Light on your dashboard is illuminated, you must have your vehicle diagnosed by a qualified mechanic or technician to determine the exact cause of the problem and treat it accordingly.