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Specialist Dealer-Level Diagnostics

Find the actual fault.

Generic OBD scanners read engine codes only. We use the same manufacturer-level tools the dealer uses — reading every module on the car: engine, transmission, ABS, airbag, body, comfort, navigation. Find the actual fault, not just the warning light.

Diagnostic equipment connected to a vehicle by Dashtech
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When the warning light
won't go away — we can help.

Most diagnostic problems aren't simple. They're the ones generic scanners miss, garages keep guessing on, and dealers charge a fortune to even look at. These are the cases we see most.

01 / Persistent

Warning light won't clear.

Cleared the code, drove off, light comes straight back on? Means the underlying fault is still active. We trace the code to its actual source — sensor, wiring, related module — rather than just clearing it and hoping.

Root cause found
02 / Intermittent

Faults that come and go.

Engine misfire under load. Random limp-mode events. ABS light triggered by bumps. Intermittent faults are the hardest — they need live data logging, freeze-frame analysis and the right tooling to catch them in the act.

Live data captured
03 / Multi-garage

Three garages, no answer.

Been to several places, all of them guessing? Generic scanners read fault codes but miss what manufacturer tools see — module-specific data, hidden parameters, cross-module conflicts. We pick up where they left off.

Where others stopped
04 / Post-repair

Fault came back
after a repair.

Had a part replaced and the same fault returned within weeks? Means either the wrong part was changed, the new one wasn't coded, or the actual fault is somewhere else feeding bad data. We diagnose the chain.

Real fault traced
05 / Hidden modules

Faults in modules you
didn't know existed.

Modern cars have 30+ modules. Generic scanners read maybe 5. Faults in gateway, body control, airbag and comfort modules cause real-world symptoms but stay invisible to most tools. We read every module, every time.

Full system scan
06 / Pre-purchase

Pre-purchase inspection.

Buying a used car and want to know what the seller hasn't told you? Full diagnostic scan reveals hidden fault codes, module replacements, mileage discrepancies, modifications and recent error history.

Buy with confidence

Read everything.
Find the truth.

Most workshops read engine codes, change parts, and hope. We read every module, correlate the data, and isolate the actual fault — so you replace what's actually broken, not what the easiest guess is.

  1. 01

    Full system scan

    Manufacturer-level tools to read every module on the car — not just the engine ECU. Stored faults, pending faults, freeze-frame data, live values, adaptation values. Full picture, not a snapshot.

  2. 02

    Correlate & isolate

    Faults in different modules often point to a single root cause. We map the chain, identify which fault is the trigger and which are downstream effects — so the actual broken part is the one that gets attention.

  3. 03

    Verify & report

    Where we can, we verify with live testing — bi-directional control of the suspect module to confirm. You get a clear summary of what's wrong, what the fix is, and what we recommend.

Mobile diagnostics — laptop connected to vehicle engine bay

All makes,
all models.

Manufacturer-level diagnostic tools cover most modern marques. These are the makes we diagnose week in, week out:

BMW
Audi
Mercedes
VW
Porsche
Mini
Land Rover
Jaguar
SEAT
Škoda
Ford
Vauxhall
Toyota
Citroën

Don't see your make? Give us a call — Japanese, Korean, French and Italian marques are all on the list, just send the registration over and we'll confirm.

Mobile · On your driveway
Dealer tools.
Independent prices.

Most independents only have generic scanners that read the engine. We bring the same manufacturer software the dealer uses — reading every module on the car. To your driveway. At independent prices.

Real diagnostics,
real answers.

★★★★★
5.0 / 5.0Trusted by UK drivers
"

Three garages couldn't find the fault. Dashtech read every module, found a faulty gearbox sensor. Sorted within the week.

EB
Emma B.
Bolton · Land Rover Discovery
"

Intermittent ABS warning had stumped two garages. Dashtech caught it on live data inside ten minutes — cracked wheel sensor. Replaced, problem gone.

SO
Steve O.
Stoke · Volvo XC60
"

Used a pre-purchase inspection before buying a Discovery. Found three modules had been swapped the seller hadn't mentioned. Walked away — saved me thousands.

AH
Adam H.
Cheshire · Pre-purchase

Diagnostics, explained.

What's the difference between dealer diagnostics and a generic scanner?
A generic OBD scanner reads engine fault codes — it sees maybe 5 modules out of the 30+ in a modern car. Dealer-level (manufacturer) tools read every module: transmission, ABS, airbag, body control, gateway, comfort, infotainment, and more. They also see live data, adaptation values, hidden codes and module-specific tests that generic scanners can't access. We use manufacturer-level tools for every job.
My garage cleared the code but it came back — why?
Clearing a code without fixing the underlying fault just resets the counter. The fault is still happening, the ECU detects it, the light comes back on. We trace codes to their actual source — sensor, wiring, mechanical fault — rather than playing whack-a-mole with the warning light.
How long does a full diagnostic take?
A full system scan and report takes 45–90 minutes for most cars. Intermittent faults that need live-data logging or test drives can take longer. We'll always tell you up front what to expect.
Will you do the repair afterwards or just diagnose?
Both. For coding, ECU work, cluster repairs, mileage correction and most electrical faults we can carry out the repair on site. For mechanical work outside our scope (engines, gearboxes, brakes, body) we'll give you a clear report you can take to a trusted mechanic — so they're fixing what's actually wrong, first time.
Do you do pre-purchase inspections?
Yes. A full diagnostic scan before you buy reveals hidden fault codes, recent module replacements, mileage inconsistencies between modules, and any modifications. Worth its weight if you're buying a 5-figure car private.
Do you cover my make?
BMW, Audi, VW Group, Mercedes, Porsche, Mini, Land Rover, Jaguar, Ford, Vauxhall and most Japanese, Korean and French marques are routine for us. Send the registration over and we'll confirm before booking.

Free quote.

The quickest way to get a price is to call us — or WhatsApp with your reg and the symptoms. Most quotes back within minutes, 7 days a week.

Tap to call now 07550 006 999 7 days a week, 7am–9pm. We answer when we can; voicemails returned the same day.
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