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What would cause a Peugeot 405 diesel 95 airbag light comes on and the temperature gauge to stop working now also ABS come aswell?

1. Faulty airbag sensor: The airbag light coming on could indicate a problem with one of the airbag sensors in the vehicle. These sensors detect when an impact occurs and trigger the deployment of the airbags. If a sensor is faulty or damaged, it may not be able to detect an impact properly, causing the airbag light to come on.

2. Electrical problems: Electrical issues in the vehicle can affect various components, including the airbag system and temperature gauge. A loose connection or a damaged wire can disrupt the signals between different components, causing them to malfunction.

3. Faulty temperature sensor: The temperature gauge not working could be due to a faulty temperature sensor. This sensor monitors the engine's temperature and sends signals to the gauge on the dashboard. If the sensor fails, the gauge will not receive the necessary data, resulting in inaccurate or no readings.

4. ABS sensor issue: The ABS (Anti-lock Braking System) light coming on may indicate a problem with one or more of the ABS sensors in the vehicle. These sensors detect wheel speed and help the ABS system prevent wheel lockup during braking. A faulty ABS sensor can cause the ABS light to illuminate and affect braking performance.

5. ECU problems: The engine control unit (ECU) is responsible for controlling various functions in the vehicle, including the airbag system, temperature gauge, and ABS. A problem with the ECU can disrupt the communication between these components, causing the warning lights to come on and affecting their proper operation.

It is recommended to have the vehicle inspected by a qualified mechanic to accurately diagnose the problem and ensure proper repairs.