Real jobs, symptoms, fault codes and fixes from our Devon workshop, plus practical advice on DPF cleaning, AdBlue and SCR faults, and ECU remapping.
ECU RemappingWhy remap power figures rarely match the brochure or a rolling road: wheel vs flywheel bhp, DIN vs SAE correction, and how to judge a remap gain fairly.
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AdBlueAdBlue freezing in winter is normal at about minus 11°C. What a cold-morning warning means, how heater faults show up, and what never to add to the tank.
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DPF CleaningPostal DPF cleaning from anywhere in the UK: how to remove a DPF safely, pack it so it arrives intact, post it to us and refit it properly when it comes back.
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ECU RemappingHow long does a remap take? Usually 1-2 hours, including checks before and after. What happens on the day, what can add time, and when it can be done at home.
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DPF CleaningDiesel limp mode explained: the usual causes, from boost leaks and a blocked DPF to EGR, sensors and gearbox faults, what to check first and how far to drive.
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AdBlueA diesel car uses roughly 1.7 to 2.9 litres of AdBlue per 1,000 miles. Van and truck rates, how long a tank lasts, and when a change may mean a fault.
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DPF CleaningDoes DPF cleaner work? What fuel additives, sensor-port sprays and forced regens really do to soot, when one is worth trying, and why none removes ash.
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ECU RemappingHow much does a remap cost? Stage 1 is £250 at our Totnes workshop or £270 mobile. What a proper Stage 1 should include, and what cheap quotes leave out.
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AdBluePut diesel in the AdBlue tank? Why you shouldn't start it, what the diesel damages, what decides the repair bill, and what to do if it has already been driven.
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DPF CleaningDPF additive fluid (Eolys) on Peugeot, Citroen and Ford: what the low-additive warning means, whether to keep driving, and why a refill needs a reset.
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ECU RemappingA well-made remap should not cause DPF or AdBlue problems. An over-fuelled map or an existing fault can. How each happens, what to check and what to ask first.
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AdBlueDoes my diesel use AdBlue? How to check your car, why some Euro 6 diesels use SCR and others a lean NOx trap, and what each system means for the owner.
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DPF CleaningDPF cleaning cost explained: £210-£299 for an off-vehicle clean with flow testing, what sits outside the price, why quotes vary and what to ask before paying.
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DPF CleaningDPF light on? What the filter light, engine-management light, flashing glow-plug light and limp mode each mean on a diesel, and what to do next.
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ECU RemappingCommercial vehicles are remapped for how they behave loaded, not for a headline power figure. Here is what that means, and where the limits sit.
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DPF CleaningRefitting a cleaned DPF is only half the job. Here is what to seal, reset, measure and road test so the ECU is working from an accurate picture.
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ECU RemappingHigh mileage on its own does not rule out a remap. Here is what actually wears with age, why raised torque finds it, and when the honest answer is to repair first.
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AdBlueWhite crystalline deposits around an AdBlue injector are evidence, not the fault. Here is why urea crystallises, what causes it, and what to check.
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DPF CleaningWorn injectors, wrong correction values and low rail pressure can all raise soot output. Here is how fuelling faults reload a DPF and dilute engine oil.
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ECU RemappingDiesel and petrol engines are limited by different things, so the same power goal needs a different calibration route on each. Here is why the approaches diverge.
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DPF CleaningBoost leaks, a sticking VGT mechanism or an implausible air signal can load a DPF faster than it clears. Why air-side integrity belongs in DPF diagnosis.
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DPF CleaningRemoving a DPF from a road vehicle is not a legal repair in the UK. Here is where the law actually sits, and why cleaning restores the filter properly.
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DPF CleaningAsh from engine oil additives stays in a DPF permanently. Here is why oil specification, oil consumption and fuel dilution affect how long a filter lasts.
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DPF CleaningShort, cold, stop-start journeys can stop a DPF regeneration completing. Here is what duty cycle really changes, what helps, and why the Italian tune-up is oversold.
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ECU RemappingThe stock file read from your own ECU is the only reliable route back to standard. Here is why it is taken, checked and stored before anything is written.
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AdBlueNOx sensors decide whether the SCR system passes or fails its own efficiency check. Here is why they fail, and why swapping one first is rarely the fix.
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DPF CleaningExhaust gas recirculation directly affects soot production. Here is how EGR valve, cooler and bypass faults show up as a DPF that keeps loading.
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ECU RemappingA remap is a modification and has to be declared. Here is what insurers, leasing companies and finance providers need to know, and why reverting the file does not fix a non-disclosure.
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AdBlueAdBlue is not a fuel additive. Here is how selective catalytic reduction actually works, and why the warnings escalate towards reduced power and no-start.
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DPF CleaningA step-by-step look at off-vehicle DPF cleaning - removal, inspection, baseline flow testing, controlled cleaning, drying, re-testing, refit and reset.
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ECU RemappingStage 1 is software working within the standard hardware. Stage 2 is a calibration matched to hardware that has been changed - and that difference matters more than the number.
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DPF CleaningA clogged pipe, a split hose or a drifted sensor can imitate a blocked filter. Here is how to test the differential-pressure measuring path before condemning a DPF.
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DPF CleaningA restricted DPF can mean soot, ash, abnormal deposits or physical damage - each needs a different diagnosis and a different repair.
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ECU RemappingAn economy remap can change how an engine responds to torque demand, but real-world fuel saving depends on the vehicle, driver and conditions.
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DPF CleaningA DPF regeneration depends on credible engine and exhaust temperature data. Here is why an implausible signal can alter, inhibit or abort the process.
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ECU RemappingPeak torque and peak power are single points on a curve - what shapes real-world drivability is how they're delivered across the usable range.
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DPF CleaningPassive, active and forced DPF regeneration are three different processes with different limits and risks - here is what separates them and when each applies.
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ECU RemappingModern ECUs share torque data with the gearbox, so a responsible Stage 1 remap has to consider the driveline, not just the engine's headline figures.
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DPF CleaningDifferential pressure is a key DPF diagnostic reading, but only reliable when exhaust flow, sensor integrity and test conditions are accounted for.
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ECU RemappingA remap changes how torque is requested and delivered, so the vehicle needs a credible mechanical, electrical and emissions-system baseline before calibration begins.
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DPF CleaningRegeneration deals with combustible soot. Off-vehicle cleaning is a different process, used when a serviceable filter still holds ash or retained contamination.
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ECU RemappingA Stage 1 remap recalibrates torque limits, airflow, fuelling, transmission and safeguards together, not just one boost or fuel value.
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DPF CleaningA high soot or pressure reading is evidence to investigate, not proof a DPF has failed. Five checks to work through before condemning the filter.
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DPF CleaningCalculated and measured DPF soot values are both ECU estimates. What each one means, why they disagree, and what a negative measured figure like -303 g points to.
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DPF CleaningA completed regeneration clears soot - not ash, sensor faults or the root cause. Here is why a DPF can block again after a regen, and what to check before condemning the filter.
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