how to fix the error code B1242 in Toyota Tacoma N300 (2016-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative battery terminal to avoid any electrical shorts.

2. Inspect and Clean Battery Connections

• Sub-steps:
  1. Remove the battery terminals (negative first, then positive).
  2. Clean the terminals and cable ends with a wire brush to remove any corrosion.
  3. Reattach the terminals securely, ensuring a tight fit.
• Tools Required: Wire brush, wrench set

3. Replace the Battery Current Sensor

• Sub-steps:
  1. Locate the battery current sensor, usually found near the battery or within the battery cable assembly.
  2. Disconnect the wiring harness from the sensor.
  3. Remove the sensor from its mounting bracket using a socket set.
  4. Install the new sensor in reverse order of removal, ensuring all connections are secure.
• Tools Required: Socket set, screwdriver

4. Reconnect Battery and Verify Operation

• Sub-steps:
  1. Reconnect the positive battery terminal first, followed by the negative terminal.
  2. Start the engine and check for any warning lights on the dashboard.
  3. Use the OBD-II scanner to verify that error code B1242 has not returned.
• Safety Warnings: Ensure the vehicle is off before reconnecting the battery terminals.