The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.
When the throttle position sensor fails, the engine's computer tends to overcompensate with fuel, leading black exhaust coming from the tailpipe. There is a strong possibility of engine misfires, and the check engine light will come on.
Throttle position sensors can also develop "dead spots," or certain places along the throttle curve where it doesn't get a reading. When this happens, the above symptoms can occur but then stop when you further press or let off the gas pedal.
When the vehicle speed sensor fails or the wiring harness prevents signal transmission, the speedometer is the first thing that will stop functioning properly. This can be an intermittent issue where the speedometer only works occasionally, the speedometer may cease all function, or the speedometer may read erratically or incorrectly. Also, the traction control and anti lock brake warning lights specific to each vehicle may be illuminated, depending on the design of those systems. You may notice the vehicle hesitate to accelerate, cruise control will not function properly, and the vehicle may not shift properly through all of the gears.
In the event that a wheel speed sensor fails, the ABS, traction control system (TCS) and manufacturer specific stability control system lights will illuminate, informing the driver that the systems are disabled. The vehicle will be more prone to tire slip, and normal driving patterns may need to be adjusted to correct for the loss of computer control. On older vehicle's, the speedometer can be affected, causing illumination of the check engine light as well.
If the cruise control refuses to turn on at all, the actuator could be at fault. Likewise, if the cruise control stays on but does not maintain a consistent speed, the problem could be a bad actuator. In extreme cases, a malfunctioning actuator could cause the throttle to stick and prevent the vehicle from slowing down. These symptoms may point to a bad actuator. They may also point to other problems with the cruise control and related systems.
The cruise control switch can cause complete failure of the cruise control feature, but in a lucky scenario only partial functionality will be lost. This means that the cruise control may come on, but that it will not increase in speed automatically, or the cancel button does not work leading the driver to cancel cruise control with the foot brake. In some vehicles, the cruise control light may illuminate, or a warning message may be displayed due to lack of functionality.
A faulty cruise control module will simply result in deactivation of cruise control settings. This is because a detected error in the cruise control system could lead to hazardous driving conditions, so the module will be disabled, and the cruise control system warning light will be displayed. This will be a different message depending on make and model, and a warning light or message may be displayed on the driver instrument cluster.
To effectively diagnose the non-functioning cruise control in your 1999 BMW M3, begin with a methodical approach that emphasizes simplicity and thoroughness. Start by utilizing a BMW scanner to read any fault codes, as this will provide valuable insights into the specific issues affecting the cruise control system. Next, check the functionality of the high beam switch and flashers, as malfunctions in these components can disrupt cruise control operations. It’s also essential to inspect the cruise control buttons to ensure they are sending the correct signals when activated. Following this, verify the integrity of the wiring connections, particularly those linked to the clock spring, to rule out any electrical faults. If these preliminary checks do not reveal the problem, consider testing the cruise control unit itself for internal failures. Additionally, don’t overlook the rear brake light switch, as its malfunction can also impede cruise control functionality. If you find yourself stuck or unable to pinpoint the issue, consulting a specialist with expertise in BMW vehicles can provide the necessary guidance for a thorough diagnosis and repair. By following these steps, you can systematically identify and address the root cause of your cruise control issues, ensuring a smoother driving experience.
When dealing with cruise control issues in a 1999 BMW M3, it's crucial to start by examining the electrical components of the system. A blown fuse is often the simplest explanation for a malfunctioning cruise control, so checking the fuse box should be your first step. If the fuse is intact, the next area to investigate is the instrument cluster, as a malfunction here can disrupt the cruise control's functionality. Additionally, individual gauge malfunctions may indicate sensor issues or broader electrical problems that could affect the cruise control system. It's also important to inspect the wiring and connections for any signs of looseness or corrosion, as intermittent failures can often be traced back to these types of electrical issues. By systematically checking these components, you can identify and address the root cause of the cruise control malfunction, ensuring that this convenient feature is restored to full working order.
Addressing the non-functioning cruise control in your 1999 BMW M3 is not just a matter of convenience; it is a critical safety concern that warrants immediate attention. An illuminated Check Engine Light (CEL) often accompanies cruise control malfunctions, signaling that there may be underlying issues that could escalate if left unresolved. Ignoring these symptoms can lead to more severe complications, potentially affecting other vehicle systems and resulting in costly repairs down the line. For those who frequently embark on long drives, the absence of cruise control can significantly detract from the driving experience, making it essential to restore this feature for comfort and safety. By prioritizing the repair of your cruise control system, you not only enhance your vehicle's performance but also mitigate the risk of further damage, ensuring a safer and more enjoyable ride.
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