Common dash warning lights in the McLaren 540C are check engine/EPC, abs, traction, srs airbag & service messages, but the full list of warning lights is shown below.
If you prefer a multi manufacturer OBD2 scan tool tool that works on this McLaren 540C & other makes & models, we highly recommend this Autel MK908 PRO II
McLaren 540C Check Engine Warning Light Meaning
ENGINE SYSTEM FAULT - The check engine warning lamp illuminates when the ignition is switched on & turns off when the engine starts.
If the engine lamp illuminates when the engine is running, a fault has been detected & you should get the fault diagnosed as soon as possible.
With the lamp illuminated, the vehicle may enter limp-home mode. Limp-home mode reduces vehicle performance to safeguard against any further damage to the vehicle. You may also see the messages FAULT OF THE ENGINE CONTROL SYSTEM or ENGINE CONTROL FAULT VISIT WORKSHOP DRIVE ON POSSIBLE
To diagnose/reset this check engine light, and remove the vehicle from Limp-home mode, we recommend the McLaren Diagnostic Tool Autel MK908 PRO II. With this tool, you can also view lots of live data like temperatures, pressures from all areas of the engine and transmssion system.
The tool is in stock with same day dispatch & worldwide delivery.
McLaren 540C Airbag Warning Light Meaning
The airbag warning lamp illuminates, as a bulb check, when the vehicle's ignition is switched on & will turn off when the engine is started.
If the lamp illuminates again while driving, there is a fault with the airbag system. You can diagnose & reset the airbag fault codes & warning light with the McLaren Diagnostic Tool Autel MK908 PRO II
The tool is in stock with same day dispatch & worldwide delivery.
McLaren 540C ABS ESC Warning Light Meaning
The ABS ESC warning lamp illuminates briefly, as a bulb check, when the vehicle's ignition is switched on & will turn off when the engine has started.
If the lamp remains on while driving there is a fault with the ABS system. Drive with care, avoiding heavy brake pedal application.
You can diagnose faults in the ABS system with the McLaren Diagnostic Tool Autel MK908 PRO II
The tool is in stock with same day dispatch & worldwide delivery.
McLaren 540C Traction ESC Control Warning Light Meaning
ESC FAULT - The traction Control lamp flashes when the system is active and the car is struggling for traction for example when driving over snow, ice, dirt roads.
If there is a fault with the system, it remains illuminated and the instrument panel displays a warning message. It is normally illuminated alongside the ABS warning light.
To diagnose a fault in this system, we recommend the McLaren Diagnostic Tool Autel MK908 PRO II
The tool is in stock with same day dispatch & worldwide delivery.
McLaren 540C EPB Electronic Parking Brake System Warning Light Meaning
The Electric Parking Brake (EPB) warning lamp illuminates if the EPB is correctly applied.
If the lamp illuminates during normal driving conditions, a fault has been detected. To find faults in this system, or calibrate the EPB electronic parking brake, open & close the calipers for brake bad removal/refitting we recommend the McLaren Diagnostic Tool Autel MK908 PRO II
The tool is in stock with same day dispatch & worldwide delivery.
McLaren 540C Brake Exclamation Warning Light Meaning
The brake warning lamp illuminates briefly, as a bulb check, when the vehicle's ignition is switched on.
If the lamp illuminates red while driving, suspect low brake fluid level or a fault with the ABS braking system.
To diagnose a fault in the braking system of your Mclaren 540C, we recommend the McLaren Diagnostic Tool Autel MK908 PRO II
The tool is in stock with same day dispatch and worldwide delivery.
McLaren 540C TPMS Tyre Pressure Warning Light Meaning
The Tyre Pressure Monitoring System (TPMS) lamp illuminates yellow to warn that one or more tyres are significantly under-inflated.
Stop the vehicle as soon as possible, when safe to do so. Check the tyre pressures. Inflate to the recommended pressure.
The lamp flashes to indicate a system fault. To diagnose a TPMS fault, we recommend the McLaren Diagnostic Tool Autel MK908 PRO II
The tool is in stock with same day dispatch & worldwide delivery.
Mclaren 540C Service Interval Service Due Oil Change Message Reset Tool
There is a specific service schedule for your Mclaren 540C. When the oil service or inspection needs to be carried out, you will see this message when starting the vehicle, and also turning off the vehicle.
To reset the Oil Change Now message on your McLaren 540C, we recommend using the McLaren Diagnostic Tool Autel MK908 PRO II
The tool is in stock with same day dispatch & worldwide delivery.
McLaren 540C Electronic Throttle Calibration/Adaption Tool
You can calibrate the Electronic Throttle system (ETC) on your McLaren 540C by using the McLaren Diagnostic Tool Autel MK908 PRO II
The tool is in stock with same day dispatch & worldwide delivery.
McLaren 540C Electronic Parking Brake EPB Tool
You can open & close the brake calipers, and calibrate the Electronic parking brake system (EPB) on your McLaren 540C by using the McLaren Diagnostic Tool Autel MK908 PRO II
The tool is in stock with same day dispatch & worldwide delivery.
1. Does that tool have the capability for the system/warning light you are trying to reset? So for example, lets say you have an ABS warning light on your dashboard. You need to make sure you are buying a scan tool that has ABS capabilities and will actually allow you to communicate with the ABS system.
2. Assuming you do have the correct scan tool for the job, the next thing to look at is why the tool isnt turning off the warning light. When you attempt to reset the fault codes using the scan tool, it is communicating with the ECU, and asking the ECU to turn the light off.
If the light does not turn off, it means that the ECU has refused the request, and that it is not happy that the problem has been fixed. In other words the problem is still present, and if you think you have physically fixed the issue, you might need to go over everything again, checking connections, wiring etc.
It can be a misconception that these tools are a kind of magic pill, and that the tool can just reset a warning light without taking any action to fix the fault. This is not correct, in 99% of cases, you need to physically fix the fautl before the warning light in your Mclaren 540C can be turned off. The rare situations where the warning light will turn off without any physical fix is where a sporadic or intermittant fault has occured.
