Frequently Asked Questions

A full clean uses a chemical flush to dissolve soot and ash first, then a controlled regen to burn the remainder. A forced regen alone burns loose soot but can’t remove hardened ash.

If back-pressure is high but the substrate isn’t cracked, a professional clean restores flow for a fraction of the price of a new filter.

Yes—live data after the flush shows soot mass and back-pressure drop to factory levels. The DPF lamp clears before you leave.

Setup, soak and regen typically take 60–90 minutes while you relax in our waiting area.

We monitor exhaust temperature and pressure throughout, keeping everything within OEM limits.

An on-car clean is a flat £200. Off-car refurbishment or postal cleaning is quoted up-front.

Motorway-driven vehicles may last 100 k miles; city vans often need attention every 25–40 k miles.

Absolutely—clean filters cut particulate output and clear warning lamps that would otherwise fail the test.

A hydrogen-based system breaks down soot inside the intake, valves and EGR without adding chemicals to the fuel.

Yes—removing carbon restores smooth idle, reduces flat spots and can improve MPG by 3-5 %.

No abrasives or acidic cleaners are used; the engine simply burns the softened deposits away at controlled temperature.

45–60 minutes including pre- and post-clean diagnostics.

From £100 for most cars and light vans.

Often yes—lower soot and HC levels help petrol and diesel engines pass retests.

Every 40–60 k miles on short-trip cars; high-mileage diesels benefit every 30 k miles.

No—temperatures stay below sensor limits, and no parts are removed.

Fuel, boost, timing and torque limiters are recalibrated for UK fuel and safe hardware limits.

Turbo-diesel: +25-35 bhp / +50-80 Nm. Turbo-petrol: +20-30 bhp with sharper throttle.

All files keep EGT, lambda and boost inside factory safety margins.

Driven normally, many drivers see 5-10 % better motorway economy.

Stage 1 files keep DPF, EGR and SCR intact, so cars that passed before will pass after.

Yes—we keep the original file and can flash it back in minutes via OBD.

Declare the mod to insurers; factory Warranty (Terms & Conditions apply) may be void if a dealer detects the tune.

60–90 minutes in our garage; from £250 for Stage 1.

It recirculates exhaust gas to lower combustion temps and NOx. Carbon fouling makes it stick.

Rough idle, flat spots, increased fuel use and P0400-series codes.

Yes—hardened deposits need soaking and brushing off the pintle and seat.

60-90 minutes including adaptation reset.

£120–£180; much cheaper than a new electronic valve.

2-4 % better MPG and smoother throttle after cleaning.

Yes—restores NOx control and clears MIL codes that fail the test.

25-40 k miles on urban diesels; sooner if codes reappear.

An engineered solvent flush dissolves carbon on manifold runners and VNT vanes without removing the turbo.

P0299 under-boost, late spool, flat spots around 1 800 rpm and high EGTs.

We use a non-caustic detergent approved for alloy housings and sensors.

60-90 minutes including vane exercise and boost logging.

Faster spool, stronger mid-range and 2-4 % better MPG.

£150–£220 depending on engine size and access.

Yes—lower exhaust back-pressure helps correct regeneration interval.

Cleaner burn reduces smoke opacity and NOx, aiding MOT pass rates.

It measures exhaust O₂ and lets the ECU fine-tune fuelling for perfect AFR.

Lazy switching waveform or P0130/P0171 codes after short trips.

Yes—oxygen-safe decarboniser and ultrasonic agitation off the car.

45-60 minutes per sensor including reset.

3-5 % MPG boost and steadier idle once response is restored.

Accurate O₂ feedback improves cat efficiency, lowering CO/HC.

£80–£100 to clean vs £120–£180 to replace with OE probe.

40-60 k miles on short-trip petrol; diesels as needed when codes reappear.