Electrical problems in your car?

A modern vehicle includes hundreds of meters of wiring, dozens of sensors, modules, and ECUs. The electrical system powers not only lights and engine start, but also climate control, multimedia, safety, fuel injection, and transmission. Even a small fault can cause random errors, unstable engine operation, or a full shutdown.

At Mario Garage (Cagnes-sur-Mer), we perform professional diagnostics and repair of automotive electrical systems — from premium German vehicles to everyday city cars. We use BOSCH, AUTEL, and FLIR (thermal camera) equipment to detect even the most complex faults.

Symptoms that require urgent diagnostics:

- Car won’t start or stalls at idle

- Starter clicks but doesn’t crank

- Warning lights flash or stay on without cause

- Dashboard functions erratically

- Power windows, locks, A/C, multimedia don’t work

- Headlights or brake lights flicker or fail

- Steering lock or Start/Stop button issues

- Vehicle enters limp mode

- Battery drains overnight

Common causes of electrical faults:

- Bad ground contact on chassis or engine

- Broken wires (common in doors or trunk)

- Burnt terminals, oxidized connectors

- Blown fuses or wrong relay installed

- Faulty BSI, BCM, UCH, ECU, ABS, ESP modules

- CAN bus short circuits or communication loss

- Errors caused by aftermarket alarms or electronics

Included in professional diagnostics:

- Checking fuses, relays, and connections

- Parasitic draw testing (rest current)

- Verifying grounds on body, engine, lighting

- Voltage tests on critical lines

- OBD2 scanning of modules (BSI, ECU, ABS, AIRBAG)

- Oscilloscope signal analysis

- Use of multimeter, clamp meter, thermal imaging

Diagnostics by vehicle type:

Petrol cars:

- Doesn’t start despite good battery

- Requires brake press to crank

- Faults on fuel sensors or throttle body

Diesel cars:

- Stalls when opening doors or turning on lights

- No communication with ECU

- Glow plug system errors

Hybrid and electric cars:

- HV system errors

- Charging failure or stuck in “P”

- CAN communication or onboard charger faults

Frequently Asked Questions (FAQ)

What if nothing works in the car?

First check the ground and battery, then modules.

Can you install a used BSI?

Sometimes yes, but reprogramming or cloning is required.

How much does electrical diagnostics cost?

From €59 to €129 depending on complexity and time.

What if the problem is intermittent?

We use data loggers to analyze saved fault data.

Is thermal imaging really useful?

Yes, especially if you suspect hot relays, connectors or ground points.

Do you fix the problem or just find it?

We fix everything: contacts, wiring, modules — whatever’s needed.

What brands do you service?

BMW, Mercedes-Benz, Audi, Volkswagen, Peugeot, Fiat, Porsche, Mini, Alfa Romeo, Citroën, Renault, Ferrari, Bentley, Rolls-Royce

How long does complex diagnostics take?

Up to 3 hours if it's intermittent or load-sensitive.

What you get after diagnostics:

- Complete fault code report

- Photo/video summary if needed

- Explanation of issues and causes

- Repair proposal

- Honest recommendations

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Service area:

Antibes, Villeneuve-Loubet, Saint-Laurent-du-Var, Nice Ouest, La Colle-sur-Loup, Vence, Biot, Carros, Roquefort-les-Pins, Grasse, Valbonne

Book your appointment now!