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Car diagnostics and troubleshooting

A fault code tells you where to start looking, not what to replace. We trace faults to their cause so you only pay for the repair you need.

Mercedes-Benz and Hummer under repair, with the New Zen Werkz Pte Ltd banner on the wall

What we diagnose

Engine warning lights, gearbox faults, ABS and airbag lights, electrical problems, starting and charging faults, rough running, overheating, noises and vibrations, and faults that only appear now and then.

How diagnosis works

We read the fault codes and live data from the car's control units, then test the suspect parts directly: wiring, sensors, pressures and signals. A code such as "lean mixture" can come from a vacuum leak, a sensor, the fuel pump or an injector. Testing tells us which one.

Once the cause is confirmed, we explain it in plain language and give you the options before any repair starts.

Check engine light: steady or flashing?

A steady light means a fault has been stored; get it checked soon. A flashing light usually means the engine is misfiring badly enough to damage the catalytic converter, so reduce speed, avoid hard acceleration and have the car looked at straight away.

Common questions

What should I do when the check engine light comes on?

If it is steady, book a check soon. If it is flashing, drive gently and get the car to a workshop as soon as possible, because a flashing light usually means a serious misfire.

Can a scan tool tell exactly what is wrong?

It tells us which system logged a fault and gives us data to work with. The faulty part is confirmed by testing, which avoids replacing parts on a guess.

Do you troubleshoot intermittent faults?

Yes. Faults that come and go take more testing, so tell us when it happens, how often, and what the car was doing at the time.

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Car not feeling right?

WhatsApp or call the workshop and tell us what you have noticed.

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