FIRST DIAGNOSTIC

Remote OBD-II Diagnostics

Know what's wrong
before you touch a wrench.

Send us your fault codes and symptoms. A real, professional mechanic reviews them personally and replies in plain English — not an automated code lookup, no garage visit, no guessing at parts.

Start a request See the service levels

P0301 · P0420 · P0171 · U0100 — whatever your scanner shows, we can work with it.

01

No garage visit

Everything happens over the request form or a call — your car doesn't move.

02

A real mechanic reads your codes

Fault codes point at a system, not a part. A professional mechanic reasons through what's actually likely — not an automated code-to-text tool.

03

Know before you spend

Get a fault-finding plan before you pay a shop to start swapping parts.

Service levels

Pick how deep you need to go.

All three start the same way — you tell us the codes and what the car is doing. Every request is read and answered personally by a professional mechanic, never generated automatically. Each service is capped per hour to keep replies fast — if a service shows sold out, the next hour's slots open automatically.

REF · QD-1

Quick Diagnosis

A fast read on what your codes likely mean.

  • You send your fault code(s) and a description of the symptoms
  • Limited to 5 new requests per hour, to keep replies quick
  • You get back the most likely causes and sensible next steps
£20 per request
Book & pay — £20 Send details first →
Most thorough
REF · DD-2

Detailed Diagnostic

A full fault-finding plan, not just a guess.

  • You submit your fault codes, symptoms, and any history that's relevant
  • Limited to 1 new request per hour, so it gets proper attention
  • We build an in-depth diagnosis and a step-by-step fault-finding plan, with diagrams for mechanical and wiring checks
£40 per request
Book & pay — £40 Send details first →
REF · VC-3

Voice Call Session

Talk it through with someone, live.

  • A direct one-on-one call, 30 minutes
  • Booked in one-hour slots, Mon–Fri 11:00–20:00 — great for after work
  • Walk through symptoms, codes, and what you've tried in real time
£50 / 30 min call
Book & pay — £50 Send details first →

Membership

Get to the front of the queue.

For anyone who wants us on hand regularly — a running car needs the odd fault chased down more than once.

£9.99/ month

Billed monthly. Cancel any time — just email us and it stops at the end of the current month.

Join as a member

Automatic monthly billing for this plan is being set up — for now, sign up by email and we'll confirm payment with you directly.

✓

Priority responses

Member requests are reviewed ahead of one-off requests — you're not waiting behind the queue.

✓

Discounted member rate

Quick Diagnosis, Detailed Diagnostic, and Voice Call requests are all priced lower while you're a member.

Process

How a request moves.

Choose a service level

Quick Diagnosis, Detailed Diagnostic, or a Voice Call — pick what fits the situation.

Send codes & symptoms

Fill out the request form with your fault code(s), the vehicle, and what it's doing.

We review off-line

A professional mechanic works through the codes against your symptoms — no live wait needed.

Get your answer

A written diagnosis and plan land in your inbox, or you get your booked call.

Request a diagnosis

Tell us what the car's doing.

Fill this in and it opens a pre-filled email in your mail app, addressed to us — hit send and we'll reply once we've reviewed it. Ready to pay now? Use the Book & pay button on your chosen service level above — that's where the transaction and receipt happen.

We take one call per hour, so that time stays free for Quick Diagnosis replies too — no call needed if a written answer works for you.

No phone number needed to get started — we only need it if you book a Voice Call Session.

FAQ

Before you send codes over.

I don't have an OBD-II scanner — can I still use this?+
You'll need the fault code(s) pulled at least once — most parts stores and many chain garages will read them for free. Once you have the codes, send them over along with what the car is doing.
Am I getting an automated report, or a real person?+
A real one. Every request is read and answered personally by a professional mechanic — we don't run your codes through an automated generator. The reply reflects actual reasoning about your codes, your symptoms, and your specific car.
Does this replace an in-person diagnosis?+
Not always — some faults need a hand on the car (a scope, a multimeter, physical inspection). What you get is a clear starting point: what the codes usually mean, what to check first, and whether it's a DIY-reasonable job or one for a garage.
What should I include for the best answer?+
The fault code(s) exactly as shown, the vehicle year/make/model/engine, when the symptom happens (cold start, under load, at speed...), and anything you've already replaced or checked.
How do I pay, and when do I get contact details?+
Prices are listed with each service level above — £20 for Quick Diagnosis, £40 for Detailed Diagnostic, £50 for a 30-minute Voice Call. Payment goes through our Shopify checkout; direct contact details are shared once you go ahead with a service.
What if my code isn't listed in your examples?+
The examples on this page are just illustrations of the format — send whatever code your scanner actually shows, P-, B-, C-, or U- prefixed, and we'll work from that.
How does call booking work?+
We take one 30-minute Voice Call per hour, Monday–Friday, 11:00–20:00 — deliberately covering after-work hours like 5–6pm, when most DIY jobs actually happen. Pick a preferred hour when you request one and we'll confirm the exact slot by email, since it may already be taken. The rest of each hour goes straight into Quick Diagnosis and Detailed Diagnostic replies, which is also why those don't need a booked slot at all.