Frequently Asked Questions

Common signs include a DPF warning light on your dashboard, reduced engine power (limp mode), increased fuel consumption, and a strong smell from the exhaust. Your vehicle may also feel sluggish or unresponsive. If you notice any of these symptoms, we recommend getting a diagnostic check before the situation worsens.

In most cases, yes. A professional DPF clean can restore your filter to near-original performance at a fraction of the cost of a new unit. Replacement is only necessary if the filter is physically damaged, cracked, or has failed beyond recovery. We assess every DPF before cleaning to advise you on the best course of action.

Most DPF cleans are completed within 2–4 hours depending on the vehicle and the severity of the blockage. We aim to have you back on the road the same day. Our mobile service means you won't even need to travel — we come to your home or workplace.

The most effective prevention is regular motorway or A-road driving that allows passive regeneration to occur. If you mainly do short urban trips, active regeneration may not complete fully. Using the correct engine oil, keeping up with servicing, and addressing issues like a faulty EGR valve or fuel injectors will also help extend your DPF's life.

If your vehicle is still under a manufacturer's warranty, remapping may affect it as manufacturers can detect ECU modifications. However, once a vehicle is outside warranty, this is not a concern. We recommend checking your warranty terms before proceeding. For older vehicles with no manufacturer warranty, remapping poses no warranty risk.

When carried out by experienced professionals using quality software, ECU remapping is safe and will not damage your engine. We only operate within safe parameters for your engine — we never push beyond what the hardware can safely handle. A good remap should actually be kinder to your engine by optimising fuelling and combustion efficiency.

Results vary depending on the engine. Turbocharged diesel engines typically see the greatest gains — often 25–35% more power and torque. Turbocharged petrol engines see gains of around 15–20%. Naturally aspirated engines see more modest improvements. We'll give you a realistic estimate for your specific vehicle before we begin.

Yes. Before remapping, we always read and save the original ECU file. This means your vehicle's original map can be restored at any time if you ever decide to sell the car or revert to factory settings. We retain a copy of the original file for all vehicles we remap.

Common symptoms include rough or unstable idling, hesitation or stumbling when accelerating, a noticeable drop in power, increased fuel consumption, black smoke from the exhaust, and engine fault codes. Your vehicle may also go into limp mode. These symptoms often appear gradually as carbon build-up worsens over time.

Yes, indirectly. A faulty EGR valve can cause the engine to run inefficiently, resulting in higher emissions that may exceed MOT limits. It can also trigger a warning light, which is an automatic MOT failure. Cleaning or fixing the EGR valve before your MOT is always a sensible precaution if you're experiencing any symptoms.

There's no fixed interval — it depends on the vehicle, mileage, and how it's used. High-mileage diesel vehicles used predominantly on short urban trips tend to accumulate carbon deposits faster. As a rough guide, many diesel engines benefit from an EGR clean every 40,000–60,000 miles, or sooner if symptoms appear.

A professional clean is highly effective and will restore normal operation in most cases. However, if the underlying cause of excessive carbon build-up isn't addressed — such as a faulty injector, incorrect oil, or a vehicle that's never driven on long runs — the problem may recur. We'll advise you on any preventative measures after completing the clean.

We can diagnose all common dashboard warning lights including engine management (check engine), DPF, EGR, ABS, traction control, airbag/SRS, oil pressure, coolant temperature, battery, TPMS, and more. Our equipment communicates with all major electronic systems in your vehicle.

We can clear fault codes as part of our service, but we always advise on what the fault was first. If the underlying issue hasn't been resolved, the code will typically return. We believe in honest, transparent service — we won't clear codes without making sure you understand the situation and the implications.

A standard diagnostic check typically takes 30–60 minutes depending on the number of systems being checked and the complexity of the fault. If the fault is straightforward, we can often identify and resolve it in the same visit. More complex faults may require further investigation or parts.

A diagnostic check is often a good starting point before any significant repair work, as it helps confirm the root cause rather than guessing. This saves money in the long run by ensuring the right parts are ordered and the correct repair is carried out first time. We recommend a diagnostic check whenever a warning light is present.

Signs include rough idling, a slight loss of power compared to when the vehicle was newer, increased fuel consumption, sluggish acceleration, and occasional misfires. If your DPF is blocking more frequently than it should, carbon build-up in the intake system may be a contributing factor. A carbon clean is also worthwhile as a preventative measure.

Yes — our hydrogen carbon cleaning process is entirely safe for your engine. The hydrogen and oxygen introduced into the intake system burn away deposits without leaving any harmful residue. The process operates within safe temperature and pressure limits and has been used on hundreds of thousands of vehicles worldwide without issue.

The carbon cleaning process itself typically takes 45–60 minutes. Including preparation, a diagnostic check before and after, and a test drive, most appointments are completed within 1.5–2 hours. We offer this service both at our Essex workshop and via our mobile unit.

For most vehicles, we recommend a carbon clean every 25,000–30,000 miles, or every 2–3 years for lower-mileage vehicles. If you predominantly do short urban journeys in a diesel vehicle, more frequent cleaning may be beneficial. A carbon clean before major long trips or when selling a vehicle is also a popular choice.

An AdBlue warning light can indicate low fluid level, a fault with the SCR system, a failing NOx sensor, an AdBlue pump or injector issue, or a software fault. The only way to know for certain is a proper diagnostic scan. Simply topping up the fluid won't resolve a system fault — it requires investigation with the right equipment.

Many AdBlue-related fault codes are triggered by software thresholds or calibration issues rather than a physically failed component. A software fix involves reprogramming the relevant control module to resolve the fault at the software level, clearing the warning light and restoring normal operation — without replacing any hardware. This is a genuine, lasting fix, not just a code clear.

Yes. Some vehicles will eventually refuse to start when an AdBlue fault has been ignored for too long. This is a manufacturer-imposed restriction and can in many cases be resolved through a software fix or by addressing the underlying fault. Contact us and we'll advise on your options — our mobile service means we can come to you if the vehicle is undriveable.

Main dealer AdBlue repairs often involve replacing components that aren't actually defective, or charging for software updates at high labour rates. Our diagnostic-first approach means we only recommend what's actually needed. Software fixes in particular represent a significant saving — often hundreds of pounds less than a dealership quote for the same outcome.

P2002 is triggered when the ECU detects that DPF efficiency has dropped below an acceptable threshold. The most common causes are a blocked or partially blocked DPF, a faulty differential pressure sensor giving incorrect readings, a failed DPF temperature sensor, or issues with the regeneration system that prevent the DPF from cleaning itself. An EGR fault that increases soot production can also be an indirect cause.

You may be able to drive short distances, but continued driving with a P2002 code risks pushing the DPF to a point where it can no longer be cleaned and must be replaced. Your vehicle may also enter limp mode, restricting engine output. We recommend getting the fault properly diagnosed as soon as possible to avoid escalating repair costs.

No. Clearing the code without addressing the underlying fault will simply result in the code returning — often within a short distance. The P2002 code is a symptom, not the fault itself. A proper fix requires identifying why the ECU is logging the code and rectifying that root cause, whether it's the DPF, a sensor, or a software issue.

Cost depends on the root cause. If the fix is a DPF clean, this is significantly cheaper than a replacement. If a sensor is faulty, that's typically a straightforward and reasonably priced repair. We always carry out a full diagnostic before recommending any work, so you'll know exactly what the fault is and what it will cost to resolve before we begin.