Frequently Asked Questions – Cardoc Diagnostics

Can a car key be repaired instead of replaced?
Yes. In most cases, Cardoc Diagnostics can repair your car key by replacing the outer casing and transferring the internal components. This process avoids the cost of cutting and coding a brand-new key. The repair usually takes under 20 minutes and does not require any additional programming, making it a quick and affordable solution.

Can you code a new car key without going to the dealer?
Yes, for most makes and models. At Cardoc Diagnostics, we use professional key programming tools that let us cut and code new keys at a fraction of dealership prices. Whether you need a smart key, remote key, or standard transponder key, we can usually program it while you wait. For some of the latest vehicles, a dealer-supplied key may still be required, but we will guide you through the most cost-effective option.

Is it possible to replace my car’s ECU?
Yes. We can replace your ECU with either a new or second-hand unit. Using advanced ECU programming tools, we extract the data from your old ECU and transfer it onto the replacement module. In most cases, the hardware fails while the data remains intact, which means we can preserve your vehicle’s original factory coding.

Can you scan my car for faults?
Absolutely. Cardoc Diagnostics uses professional diagnostic tools to scan your car’s control units and identify stored faults. We provide precise, data-driven results—no guesswork. You’ll also receive a detailed PDF report of the scan.

What should I do if my airbag light is flashing?
A flashing airbag light usually means the system has stored crash data or detected a fault. Cardoc Diagnostics can diagnose the issue, clear the crash data, or replace the airbag control module if needed. This service is essential if your car has been in an accident.

How much does a spare key cost?
Pricing depends on the type of key, make, and model of your vehicle. As a guide:

  • Non-remote key: from R980

  • Remote key: from R1480

  • Smart key: from R2400

  • Mercedes-Benz Fobik keys: from R2380

  • BMW semi-smart keys: from R2200

  • BMW full smart keys: from R3680

What happens if I’ve lost both my car keys?
We can help. Your vehicle will need to be towed to our workshop in Goodwood, Cape Town, so we can program new keys from scratch.

Where can I get my key coded or repaired?
You can book directly with Cardoc Diagnostics. Contact us via WhatsApp or phone to schedule an appointment. Our workshop is based in Goodwood, Cape Town, and we provide quick turnaround times.

Does Cardoc Diagnostics accept card payments?
Yes. We accept card machine payments for your convenience.

Do you offer a guarantee on key coding services?
Yes. All new keys coded by Cardoc Diagnostics come with a 3-month guarantee against internal failures.

How long has Cardoc Diagnostics been operating?
Cardoc Diagnostics was established in 2020 during the COVID-19 lockdown and has been serving Cape Town motorists ever since.

Which vehicle brands does Cardoc Diagnostics cover?
We cover a wide range of vehicles, including Volkswagen, BMW, Mercedes-Benz, Toyota, Nissan, Opel, Honda, Mazda, Suzuki, Hyundai, Kia, Fiat, Porsche, and many of the latest Chinese brands such as GWM and Haval. If your brand isn’t listed, get in touch—we likely cover it.

Do BMW batteries need coding or registration?
Yes. Unlike most vehicles, BMWs require battery registration and coding whenever a new battery is installed. This ensures the vehicle’s electronic systems adapt to the new battery. Skipping this step can lead to electrical issues.

What are the symptoms of BMW FRM (Footwell Module) failure?
Common signs include headlights or windows not working, indicators failing, or electrical malfunctions after a flat battery. Cardoc Diagnostics specializes in FRM module repairs that restore functionality quickly and affordably.

How do I know if my Mercedes-Benz ESL is failing?
A faulty ESL (Electronic Steering Lock) often shows as the steering lock not disengaging, the engine not starting, or clicking noises when turning the key. We provide reliable ESL repairs and replacements at our Cape Town workshop.

What is a car diagnostic test?
A car diagnostic test scans your vehicle’s electronic control units (ECUs) to detect stored errors or faults. This process pinpoints issues with sensors, modules, keys, or engine management systems. Our accurate diagnostics save time and money by preventing unnecessary repairs.

What does “autotronics” mean?
Autotronics combines automotive technology with electronics. It includes systems such as ECUs, sensors, keys, airbags, and control modules. Cardoc Diagnostics specializes in autotronic repairs and coding for modern vehicles.

Do you repair car keys as well as replace them?
Yes. We repair damaged car keys, replace casings, and also program new or spare keys. Repairs are usually faster and more affordable than dealership replacements.