Quick Diagnosis
REF · FD-QD-1

Quick Diagnosis

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Get a professional read on your fault code without leaving home.

How it works

  • Send us your fault code(s) and a description of your symptoms.
  • A professional mechanic reviews your submission personally — never an automated code lookup.
  • You get a reply with the most likely causes and sensible next steps.
Reviewed by A real professional mechanic, never an automated report.
Turnaround Capped per hour so replies stay quick.
No visit Fully remote, your car doesn't move.

How it works

From your details to your answer.

1

You send the details

Add your fault codes, your vehicle and what it's doing when you book. Takes a minute.

2

A real mechanic reviews it

We work through your codes against your symptoms. Never an automated report.

3

Your diagnosis arrives

You get the likely cause and clear next steps by email. See a real example below.

Example

What a Quick Diagnosis looks like.

A real example for a 2014 Ford Focus 1.6 with codes P0301 and P0171. Yours will be written for your car.

FROMFirst Diagnostic SUBJECTYour Quick Diagnosis, 2014 Ford Focus 1.6

Thanks for the codes and the description (rough idle when cold, light came on after a motorway run).

Most likely: a misfire on cylinder 1 (P0301), with a slightly lean mixture showing as P0171.

WHAT THAT USUALLY MEANS

  • A weak or failing ignition coil on cylinder 1 is the most common cause of a single cylinder misfire on this engine.
  • The lean code often rides along with a misfire, or points at a small air leak or a dirty MAF sensor.

WHAT TO CHECK FIRST

  1. Swap the cylinder 1 ignition coil with cylinder 2, clear the codes and drive.
  2. If the misfire follows to cylinder 2 (P0302 appears), fit a new coil.
  3. If it stays on cylinder 1, check the spark plug and the injector connector there.
  4. For the lean code, look for split vacuum hoses and give the MAF sensor a clean.

This is a DIY reasonable job. If the misfire is still there after the coil and plug, reply and we'll go deeper.

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