if its the key card type, it may be the ignition relay, which is locatatd by the acclerator pedal under the dash, it is the black larger relay. with the ignition off and the engine still running give this relay a tap, car should cut out. i speak from experience as this was happening to my laguna.
To reset the service interval on a Renault Laguna, first, turn on the ignition without starting the engine. Then, press the accelerator pedal three times within 10 seconds. After that, turn off the ignition and restart the vehicle; the service interval should now be reset. If the reset is successful, the service indicator light will be off.
igination on car is turned off but car still runs
Bring to a shop that has an ABS scanner to determine the problem
After replacing the battery in your Renault Laguna, ensure the new battery is properly connected, with the positive terminal first followed by the negative terminal. Once connected, get inside the vehicle, insert the key into the ignition, and turn it to the "On" position without starting the engine to allow the electronics to reset. Then, turn the key to the "Start" position to crank the engine. If the car doesn't start immediately, wait a few moments and try again, ensuring all connections are secure.
fix airbag fault & serv light will go out
You've left your lights on!
You probably need new rear disc bearings. Once you install the new bearings, the warning light should turn off.
After replacing the battery and ECU in a Renault Laguna, ensure that all connections are secure and properly seated. You may need to reprogram the ECU using specialized diagnostic equipment to match it with the vehicle's key and immobilizer system. Once everything is connected, turn the ignition key to the "on" position without starting the engine to allow the ECU to initialize. Finally, attempt to start the engine; if it doesn't start, further diagnostics may be needed to check for any additional issues.
That's easy... If you have a lot of money go to the Renault Service center to have it reset. On the other hand, if you dont have a single penny but u have some tools then do the following. 1. Remove Negative battery terminal for about 15minutes to allow the resistors/capacitors of the faulty light to turn off. 2. after 15 minutes put back the negative terminal and start your engine. 3. Dont be shocked if no lights appear... 4. Turn off your engine and turn on again then your problem is solve. ---MaxiExtreme-
Weak battery Loose or corroded battery cables
You need a scan tool.
disconnect the tyre pressure receiver located mid way under the car on the left hand side