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.
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.
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 a non-functioning cruise control system in a 1995 BMW 740i, start with a systematic approach that prioritizes simpler checks before delving into more complex diagnostics. Begin by examining the speed sensor, as it plays a crucial role in relaying the vehicle's speed to the cruise control module. If the speed sensor is faulty, it can disrupt the entire system. Next, inspect the cruise control module itself, which acts as the control center for the system, ensuring it is receiving accurate signals from both the speed sensor and the cruise control switch. Following this, assess the Engine Control Module (ECM) to confirm it is responding correctly to commands from the cruise control module. If the Check Engine Light is illuminated, utilize an OBD2 scanner to identify any error codes that may indicate a broken speed sensor or other issues. Additionally, check the brake system, as a malfunctioning brake lever can prevent the cruise control from engaging. Finally, verify the functionality of the cruise control buttons to ensure they are sending the correct signals. By following this structured diagnostic approach, you can efficiently identify and resolve the issues affecting the cruise control system in your BMW.
When dealing with cruise control issues in a 1995 BMW 740i, several common problems may be at play. One of the primary culprits is a malfunctioning steering angle sensor, which can disrupt the cruise control system's functionality. Additionally, a fault in the control module can lead to the "Active Steering Inactive" warning, further complicating the cruise control operation. It's also important to check the power steering fluid levels, as low fluid can contribute to steering-related problems that affect cruise control. Electrical issues, such as a blown fuse or problems within the instrument cluster, can cause multiple gauges to fail, which may also impact the cruise control system. Lastly, sensor malfunctions can lead to individual gauge issues that disrupt the cruise control's performance. By systematically addressing these potential problems, DIYers can effectively troubleshoot and restore the cruise control functionality in their BMW 740i.
Addressing the non-functioning cruise control in your 1995 BMW 740i is not just a matter of convenience; it is a critical safety concern that requires 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. Delaying repairs can lead to dangerous driving conditions, as a malfunctioning cruise control system can disrupt your ability to maintain a steady speed, increasing the risk of sudden stops or starts. Furthermore, the root causes of cruise control failure can vary widely, from electrical issues to mechanical failures, and ignoring these symptoms may result in more severe complications that could affect your vehicle's overall performance. Ultimately, timely repairs not only enhance your driving experience but also ensure compliance with roadworthy standards, making it essential to prioritize fixing your cruise control system as soon as possible.
Read about related problems experienced by other BMW 740i drivers like you.
See what others are asking about their BMW 740i. Get answers from RepairPal's community of auto experts and enthusiasts.