Pontypridd & Rhondda Cynon Taf

Car
Diagnostics
Engine Lights. Electrical Faults. All Systems.

Professional diagnostic equipment brought to your door. Whether it's an engine warning light, an electrical gremlin, or a full system scan before a service — PAD identifies the exact fault fast, in plain English, from £25. No call-out fee. If we can't find a fault, you don't pay.

Full System Access

Every System. Every Module.

Most cheap code readers only access the engine management system. PAD's professional equipment reads every control module on your vehicle — 56+ brands, all systems, full bi-directional access.

Engine management & emissions
ABS, traction & stability control
Airbag & SRS safety systems
Automatic & manual gearbox modules
Electric power steering (EPS)
Climate control & HVAC
DPF & exhaust aftertreatment
Battery health & charging system
CAN bus & LIN bus communication
Immobiliser & key transponder
Brake system & EPB resets
Service resets & module adaptations
Live data monitoring & actuator tests
Hybrid & mild-hybrid systems

Dealer-Grade Equipment

The same professional hardware used by independent workshops — full bi-directional control, live data streaming and actuator testing. Not a £30 Bluetooth dongle.

Plain English Results

No jargon, no guesswork. We tell you exactly what the fault code means, what is causing it, and what it will likely cost to fix — so you walk into any garage fully informed.

We Come to You

No recovery truck needed. We visit your home, workplace, or wherever your car is across Pontypridd, Treforest, Llantrisant, Aberdare, Porth, Tonypandy and all of RCT.

Written Report Emailed

Full Diagnostic and Pre-Purchase bookings include a detailed emailed report — useful for service records, negotiating a price, or handing straight to a repair garage.

Engine Warning Light

Warning Light On? Find Out Why.

An engine warning light can mean anything from a loose fuel cap to a failing catalytic converter. Only a professional scan tells you which — and PAD finds the exact fault at your door from £25.

Common causes we find
  • Oxygen (lambda) sensor failure
  • Catalytic converter fault or deterioration
  • Mass airflow (MAF) sensor issue
  • Loose, cracked or faulty fuel cap
  • EGR valve blockage or failure
  • Throttle body or position sensor fault
  • Spark plug or ignition coil failure
  • Fuel injector fault or lean/rich misfire
Why act quickly
  • MOT failure — a lit engine warning light is a major defect and causes an automatic MOT fail
  • Fuel consumption — faults like a bad oxygen sensor cause the engine to run rich, burning significantly more fuel
  • Hidden damage — a minor sensor fault left unaddressed can mask and worsen a developing mechanical problem
  • DPF blockage — diesel regeneration failures left too long can mean an expensive filter replacement

⚠ Steady Light — Monitor & Book Soon

If the engine warning light is steady and the car drives normally, it is likely safe to complete your journey. Book a diagnostic as soon as possible — do not leave it for weeks. Even a minor fault can worsen.

🔴 Flashing Light — Stop Driving Now

A flashing engine warning light usually indicates a serious misfire that can destroy the catalytic converter within minutes. Stop, switch off the engine, and do not drive further until the vehicle has been checked.

Electrical Faults

Electrical Gremlins Diagnosed Fast.

Modern vehicles have dozens of electronic modules communicating constantly. When one fails, it can trigger warning lights across the entire dashboard. PAD reads every module, pinpoints the root cause, and tells you exactly what needs fixing.

Electrical systems we diagnose
  • Battery drain, health & charging faults
  • Alternator output and voltage regulation
  • ABS, traction control & stability sensors
  • Airbag, SRS & crash sensor faults
  • Electric power steering (EPS)
  • Central locking, window & mirror faults
  • Oxygen, MAF, MAP & temperature sensors
  • CAN bus & LIN bus communication errors
  • Immobiliser, key fob & transponder faults
  • Dashboard warning light diagnosis
Common scenarios
  • Multiple warning lights after a flat battery or jump start
  • ABS light on with no obvious wheel speed sensor damage
  • Airbag light on after a minor bump or seat replacement
  • Car not starting or cutting out intermittently
  • Battery draining overnight with no obvious cause
  • Instrument cluster faults or gauges reading incorrectly
  • Electric windows, mirrors or central locking gremlins
  • Heating, climate or fan control not responding
Why modules matter: A fault in one ECU can trigger warning lights across several others. Our equipment reads every module simultaneously and pinpoints the root cause — not just the symptom. Live data monitoring also catches intermittent faults that never store a code.
Transparent Pricing

No Surprises.

Fixed prices, no call-out fee within 10 miles of Pontypridd. No deposit to book. If we can't identify a fault, you pay nothing.

Quick Scan
£25

Single warning light or known issue. Fault codes read, cleared and explained. Up to 30 minutes on site.

Pre-Purchase
£35

Full system scan before buying a used car. Includes cleared-codes check. Written report emailed.

Book Now Full Pricing & FAQ
Common Questions

Diagnostics FAQ.

PAD offers mobile car diagnostics from £25 for a Quick Scan (single warning light, up to 30 minutes) and £45 for a Full Diagnostic covering all systems with a written report emailed. Pre-Purchase checks are £35. There is no call-out fee within 10 miles of Pontypridd, and no deposit required to book.
An engine warning light means a sensor or system has flagged a fault to the vehicle's ECU. Common causes include a faulty oxygen sensor, EGR valve failure, catalytic converter deterioration, DPF blockage (diesel), or something as simple as a loose fuel cap. Only a professional diagnostic scan identifies the exact cause — and that's what PAD does, at your door, from £25.
A steady engine warning light with normal driving feel is usually safe for short distances, but you should get it diagnosed promptly — it will not clear itself and can worsen. A flashing engine warning light is serious and typically indicates a misfire that can destroy the catalytic converter within minutes. Stop driving immediately, switch off the engine, and contact PAD.
Yes. PAD's professional equipment accesses every electronic module on your vehicle — ABS, airbag, EPS, CAN bus, immobiliser, battery and charging systems and more. We read every module simultaneously to find the root cause, not just the symptom. We also monitor live sensor data to catch intermittent faults that don't always store a code.
Disconnecting or jump-starting a battery can cause one or more control modules to lose their settings or log faults — particularly on modern vehicles. Multiple warning lights appearing after a battery event is very common and usually straightforward to resolve with a professional diagnostic scan and module reset.
PAD is a diagnostic-only service — we identify exactly what is wrong and give you a clear written report. We do not carry out mechanical or electrical repairs, but we will tell you precisely what needs fixing, what to ask a garage, and roughly what it should cost. You walk in informed, not guessing.
Book a Diagnostic

From £25.
We Come to You.

No call-out fee · No fault found, you don't pay · Evenings & weekends

Book Online 07896 657792 WhatsApp