It's one of the most searched questions among local drivers: how much should a car diagnostic actually cost? The answer varies considerably depending on who you go to and what's included. This guide breaks down what you should expect to pay, what you get for your money, and how to avoid being overcharged.

The Range You'll Encounter

In and around Pontypridd, diagnostic pricing falls into three broad categories:

  • Cheap plug-in readers (£0–30): Handheld Bluetooth devices that read basic OBD engine codes only. They won't access ABS, airbag, gearbox, or body control modules. Useful for a quick look — not a professional diagnostic.
  • Garage-based diagnostics (£50–£100+): Most independent garages and main dealers charge a diagnostic fee before any work begins, and it's not always deducted from the repair bill. Many charge more if a second scan is needed after a repair.
  • PAD mobile diagnostics (£35 flat rate): Full professional visit covering all accessible vehicle modules. We come to you — home, work, or seller's driveway. Written report included. No call-out fee within 10 miles of Pontypridd, no VAT surprises, no deposit.

At £35, PAD sits well below the garage range for an equivalent or more thorough service. The difference is no premises overhead and no upsell pressure — PAD doesn't do repairs, so there's no incentive to find something extra.

What Does a Proper Diagnostic Include?

A professional diagnostic check should cover:

  • Full multi-system scan: engine, ABS, SRS airbag, transmission, body control modules
  • Live data monitoring: checking sensor readings in real time, not just stored codes
  • Freeze frame data: what the vehicle was doing when the fault was logged
  • Fault code interpretation: what the code actually means for your specific vehicle
  • Written report: a clear record of every fault found and recommended action

If a service only plugs in a basic reader and reads one code, that's not a full diagnostic — regardless of what it costs.

Is a Diagnostic Worth It Before a Repair?

Almost always, yes. Without knowing the confirmed fault, mechanics guess. Parts get replaced unnecessarily, and the actual problem stays. A proper diagnostic narrows the fault to a specific component or circuit, saving money on parts that don't need replacing.

For example: a car with a rough idle might show an oxygen sensor code, but the root cause could be a vacuum leak, a failing injector, or ignition timing — none of which would be fixed by a new O2 sensor. A £35 scan can save hundreds in misdiagnosed repairs.

Why Mobile Makes Sense for RCT Drivers

Getting your car to a garage when the engine light is on, the car is running roughly, or you're unsure it's safe to drive, adds unnecessary stress. PAD covers Pontypridd, Treforest, Rhydyfelin, Hawthorn, Church Village, Taffs Well, and the wider RCT area — coming to your home or workplace.

No waiting rooms. No time off work. Clear report. Honest explanation.

Frequently Asked Questions

Do I pay even if no fault is found?
Yes — the technician's time and equipment have been used regardless. But with PAD, you know the cost before we arrive: £35 flat, no surprises.
Can I take the diagnostic report to another garage for the repair?
Absolutely. Your report belongs to you and can be shared with any repairer you choose. PAD doesn't do repairs — so there's no pressure to use us for anything beyond the diagnostic.
Do you cover areas outside Pontypridd?
Yes — we cover Rhondda Cynon Taf and surrounding areas. Travel fee applies beyond 10 miles of CF37. Contact us to confirm coverage for your postcode.
Is £35 the only charge?
For most jobs within 10 miles of Pontypridd, yes. Travel surcharges apply outside that radius at a standard per-mile rate. Everything is confirmed before booking — no surprises on the day.