Lexus AFS Sensor Replacement: A Step-by-Step Guide

If you drive a Lexus with the Adaptive Front-lighting System (AFS), you know how important this feature is for your safety on the road. The AFS system automatically adjusts the headlights based on your speed and steering angle, providing you with better visibility in different driving conditions.

However, if the AFS sensor is faulty, it can cause the system to malfunction, leading to poor visibility and potential safety hazards. In this post, we’ll guide you through the process of replacing the AFS sensor in your Lexus, step by step.

What is the AFS Sensor?

The AFS sensor is a small electronic component that is located on the underside of the front bumper. It measures the vehicle’s speed, steering angle, and yaw rate, and sends this information to the AFS control module, which adjusts the headlights accordingly.

If the AFS sensor is not working properly, you may notice some common symptoms, such as:

  • The AFS warning light on the dashboard is illuminated
  • The headlights don’t move when you turn the steering wheel
  • The headlights are pointing in the wrong direction
  • The AFS system doesn’t work at all

How to Replace the AFS Sensor?

Before we begin, you’ll need a few tools and materials:

  • A new AFS sensor (make sure it’s compatible with your Lexus model)
  • A socket wrench with a 10mm socket
  • A flathead screwdriver
  • A pair of pliers
  • A jack and jack stands (optional)
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Here’s a step-by-step guide to replacing the AFS sensor:

  1. Locate the AFS sensor. It’s located on the underside of the front bumper, near the center. You may need to remove the lower grille or bumper cover to access it.
  2. Disconnect the electrical connector from the sensor by squeezing the locking tab and pulling the connector away from the sensor.
  3. Remove the two bolts that hold the sensor in place, using a socket wrench with a 10mm socket. Keep these bolts in a safe place.
  4. Carefully pull the sensor out of its mounting bracket. If it’s stuck, you can use a flathead screwdriver or pliers to gently pry it out.
  5. Install the new sensor in the mounting bracket, making sure it’s securely in place.
  6. Reattach the electrical connector to the new sensor by pushing it in until you hear a click.
  7. Reinstall the two bolts that hold the sensor in place, using a socket wrench with a 10mm socket.
  8. Test the new sensor by turning on the headlights and checking if the AFS warning light on the dashboard goes off. You should also turn the steering wheel to see if the headlights move correctly.
How to fix AFS Sensor Lexus 400h

Tips for Replacing the AFS Sensor

Replacing the AFS sensor may seem daunting, but with a few tips, you can make the process smoother and less stressful:

  • Be patient and take your time. Rushing the job may cause mistakes and even more problems down the line.
  • Double-check the connections before reassembling everything. Make sure the electrical connector is securely attached to the new sensor.
  • Test the new sensor before reassembling everything. This will save you time and effort in case there are any issues.
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How do you fix the AFS light on a Lexus? 

Certainly! Here’s a more detailed explanation on how to fix the AFS light on a Lexus:

  • Check for any physical damage

The AFS light may come on if there is any physical damage to the headlights or the AFS sensor. Inspect the headlights and the AFS sensor for any damage such as cracks, dents or loose wiring. If you find any damage, have it repaired or replaced by a qualified technician.

  • Check the AFS fuse

The AFS system is controlled by a fuse. Locate the fuse box in your Lexus and check the AFS fuse. If the fuse is blown, replace it with a new one of the same amperage. This may fix the issue and turn off the AFS light.

  • Check the AFS sensor

The AFS sensor monitors the vehicle’s speed, steering angle and yaw rate. If the sensor is faulty, it can cause the AFS light to come on. You can use a diagnostic tool to check the sensor or take your vehicle to a qualified technician who can diagnose and replace the faulty sensor.

  • Reset the system

Sometimes, resetting the system can fix the AFS light. To reset the system, turn off the engine and the headlights. Disconnect the negative battery cable from the terminal and wait a few minutes before reconnecting the cable. Start the engine and turn on the headlights. Check if the AFS light has turned off.

If the above steps don’t fix the AFS light, a more complex issue may require professional help. It’s always recommended to take your Lexus to a qualified technician who can diagnose and repair any issues with the AFS system.

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Replacing the AFS sensor in your Lexus can be a relatively simple process, but it’s important to take your time and follow the steps carefully. If you’re not comfortable doing it yourself, don’t hesitate to seek professional help. A qualified technician can ensure that the replacement is done correctly and safely.

We hope this guide has been helpful in guiding you through the AFS sensor replacement process. If you have any tips or experiences, please leave them in the comments section below. Stay safe and happy driving!

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