What engine diagnostics covers
We read stored and pending fault codes from the engine and related control units, look at freeze-frame data showing the conditions when a fault was logged, and examine live data such as boost, fuel pressure, airflow, temperatures and sensor readings. Where needed we carry out physical checks on hoses, wiring and components.
A fault code names what the control unit detected — for example, boost below target — rather than which part failed. The investigation is about working out why.
- 01Engine management and glow plug warnings
- 02Loss of power or limp mode
- 03Smoke, rough idle or misfires
- 04Hesitation, flat spots or poor starting
- 05Pre-remap health checks
Diagnostics before a remap
A remap on an engine with a hidden fault can make the fault more obvious or more damaging. Before tuning, we check for stored faults and look at how the engine is behaving. If we find a problem, we explain it and you decide whether to repair it first.
If your vehicle is a Ford and needs substantial engine repair work, Manchester Ford Engine Specialist is our related site for Ford engine repairs.
How we approach engine diagnostics
Diagnosis comes before parts or software. We read stored fault codes, look at live data such as sensor readings, temperatures and pressures where the system makes them available, and ask how and when the problem appears. A warning light describes a symptom that the control unit has detected; it does not always name the part that has failed, so the fault code is the starting point of the investigation rather than the answer.
Once we understand the likely cause we explain the findings in plain language and discuss the sensible options, which might be a repair, a clean, a software update, a replacement part or simply a change in how the vehicle is used. You receive a quote for the agreed scope before further work goes ahead. We will not recommend removing an emissions system as a fix for a road vehicle.
What to send us before booking engine diagnostics
The quickest way to get useful advice is to send the registration and a short description by WhatsApp or through the quote form. Support and suitability vary by engine, gearbox, control unit and software version, so a registration lets us check the right information instead of guessing. Any estimate given remotely is provisional until the vehicle has been seen and the required checks are complete.
- 01Vehicle registration and approximate mileage
- 02Make, model and engine size, if known
- 03Any warning lights, messages, symptoms or fault codes
- 04Existing remaps, tuning boxes or hardware modifications
- 05How the vehicle is used — commuting, towing, short trips or heavy loads
- 06Whether the vehicle is currently in limp mode or will not start
Visiting the workshop for engine diagnostics
All work is carried out at our single workshop at Unit 2, Lancaster Works, Kingsbridge Road, Manchester M9 5SP. We do not run a mobile remapping service and we have no other branches, so every engine diagnostics enquiry is booked into the same Manchester workshop. Visits are by arrangement: please call or WhatsApp before travelling so we can confirm the vehicle, the time and what the visit will involve.
Access is through the black gate. Call when you arrive so we can let you in, then keep left towards the rear of the site. We are open Monday to Friday 8am–6pm and Saturday 8am–1pm, and closed on Sunday. If the vehicle is in limp mode, showing a serious warning or will not start, tell us before setting off so we can talk about whether it is sensible to drive it or whether transport should be arranged.