OBD diagnostic assessment
£94.95 including VAT
OBD diagnostic assessment: £79.13 + £15.82 VAT. Replacement parts and repairs are extra. Additional investigation is agreed with you first.
See live prices →Two ways to find a fault
We choose the investigation to suit the symptom. Electronic information and a physical inspection can both be useful, but they answer different questions.
| Type of check | What it can tell us |
|---|---|
| Electronic diagnostics | Stored fault codes and relevant vehicle data point towards a system. A code alone does not prove that a particular sensor needs replacing; further checks identify the cause. |
| Mechanical inspection | Knocking, rattling and other physical symptoms may need a hands-on inspection, using the ramp where appropriate. A warning light does not have to be present. |
What happens after the scan?
We explain the fault, the checks needed and the repair options. This can involve a sensor, wiring, a mechanical component or a related system.
We only reset a warning when appropriate after the underlying problem has been addressed. If further testing is needed, we discuss the additional time and cost before proceeding.
Help us reproduce the problem
Intermittent faults are easier to investigate with a clear history. When booking, it helps to tell us:
- Whether the engine is cold or warm when the fault appears.
- The speed, driving conditions or manoeuvre that brings it on.
- Whether it began after a repair or a flat battery.
- The exact warning message; a photo or a recording of a noise can help.
From a fault code to a repair decision
Several components can affect the same reading. A lean-running code, for example, can involve unwanted air, fuel delivery or the sensor reporting the mixture.
The appropriate next check may involve wiring, live data or a mechanical inspection. We explain what the initial assessment establishes and agree any deeper investigation before committing you to replacement parts.
Frequently asked questions
How long does fault finding take?
We aim to identify many straightforward faults within an hour. Intermittent, electrical or internal engine problems can take longer. An hour is an initial guide, not a guarantee.
Does £94.95 include the repair?
No. It is the OBD diagnostic assessment price. Parts, repair labour and further investigation are priced separately.
Can you investigate a noise without a warning light?
Yes. Tell us whether it happens at idle, over bumps, when braking or at a particular speed. Mechanical inspection may be more useful than a code scan, and we confirm its cost before starting.
Related services
Your local Hertford workshop
Visit D & B Autocare at 12 Mimram Road, Hertford, SG14 1NN. We welcome drivers from Hertford and the surrounding towns.
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