Guides to warning lights, faults and remapping
Plain-English guides to the faults we fix every week, from DPF and AdBlue warnings to smoke from the exhaust. Each one explains what's going on and what your options are.
Start with the warning light
If a light has just come on, the engine management, DPF and AdBlue guides are the best place to begin. They explain what the light means, how urgent it is and what usually fixes it.
Got a code from a scanner? Our fault code pages explain the most common ones.
DPF guides
- DPF warning light: what it means. What the light is telling you and what usually clears it.
- Blocked DPF: symptoms and fixes. The signs of a clogged filter and the ways to clear it.
- DPF regeneration and forced regens. How a DPF burns off soot, and what a forced regeneration does when that fails.
- DPF cleaning and replacement costs. What a clean, a new filter and a delete typically cost.
- Is DPF removal legal? Where the law stands on removing a DPF from a road vehicle.
AdBlue and emissions guides
AdBlue warning light: what it means
Why the light comes on, from a low tank to a failed sensor.
AdBlue countdown and no restart warning
What the mileage countdown means and what happens when it reaches zero.
AdBlue pump failure
The signs of a failing pump and the options for dealing with it.
AdBlue heater and tank faults
How heater and tank faults show up, and why they're common in cold weather.
NOx sensor faults
What NOx sensors measure and the warnings a failing one sets off.
Emission system fault and anti-pollution fault
What these dashboard messages mean on Peugeot, Citroen, Renault and other makes.
Is AdBlue delete legal?
The rules on removing AdBlue from a vehicle used on the road.
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Get in TouchEGR guides
- EGR valve problems and symptoms. Rough running, smoke and limp mode from a sticking or clogged valve.
- EGR valve replacement cost. How a new valve compares with a delete on price.
- EGR cooler failure. Signs of a failed cooler, including coolant loss and white smoke.
- Is EGR delete legal? What the law says about removing an EGR system.
Want the cause confirmed?
A guide can narrow it down, but a scan tells you for certain. Our mobile diagnostic check (£100 + VAT) reads every stored code where the vehicle is parked and pins down what needs fixing.
Warning lights and limp mode
- Engine management light: what it means. The common causes of an amber engine light and what to check first.
- Engine management light flashing. Why a flashing light needs attention sooner than a steady one.
- Glow plug light flashing. What a flashing coil light on a diesel usually points to.
- Limp mode: causes and fixes. Why the engine cuts power and how to get it back to normal.
Smoke, power loss and turbo problems
Smoke from the exhaust: a colour guide
What white, black and blue smoke each point to.
White smoke from the exhaust
How to tell condensation from burning coolant or unburnt fuel.
Black smoke from the exhaust
Too much fuel or too little air, and the diesel faults behind it.
Blue or grey smoke from the exhaust
Signs the engine is burning oil, and where it's likely getting in.
Car losing power
The usual suspects behind a sudden or gradual loss of power.
Turbo problems
Overboost, underboost and sticking actuators explained.
Swirl flap problems
How swirl flaps fail and the options for dealing with them.
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Get in TouchRemapping guides
Thinking about a remap? Start with how much a remap costs, weigh up the pros and cons in is remapping worth it?, and check how a remap affects insurance and warranty before you book.
Rather have us take a look?
If a guide points to a fault, we can come out, read the codes and often fix it on the same visit.
Eccles, Manchester M30 0SF