Blog
Fault codes, sensors and the tricks of diagnostics: what the codes mean, where to start checking and why a cheap adapter sometimes lets you down.
The fault came back after the repair: why, and what to do
The part was replaced, the code cleared, and a week later the light is on again. Five causes in order of frequency, and how to tell them apart.
5 September 20264 min
P0335: the crankshaft sensor that stalls the car
A code that can stall the engine on the move and refuse to start a minute later. Where to begin, and why the part is not first.
5 September 20264 min
Why a scanner does not show ABS, airbag and gearbox faults
The ABS light is on, and the app says «no faults». The tool is not broken — it is looking elsewhere, and here is why.
5 September 20267 min
What the letters and digits in a fault code mean
P0171, C0035, U0100 — five characters, and each says something. Once you can read them, an unfamiliar code makes sense without a reference.
5 September 20264 min
A diesel in winter: glow plugs, the DPF and the fuel
A diesel has its own winter rules. Here is what is normal and what should not be put off.
5 September 20262 min
When to change spark plugs: signs and readings
Plugs die gradually and the car gets used to it. Here is what the numbers show before you feel anything.
5 September 20262 min
A code that is active, stored or pending
Three words next to the code. They decide whether to go to a garage today or simply keep an eye on it.
5 September 20263 min
How this differs from a dealer scanner
The honest answer: by a lot. Here is what any car gives, what depends on the make, and when only a dealer tool will do.
5 September 20263 min
It stalled while driving: what to do and what to check
The engine dies at speed and the steering and brakes go heavy at once. Safety first, causes second.
5 September 20263 min