#fuel
8 posts in Car Diagnostics blog about "fuel" — OBD-II diagnostics, DTC codes, repair. ← All posts
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Engine cranks but will not fire: spark, fuel or timing
A healthy-sounding crank with no start narrows the problem to three systems. Knowing which one to test first, and what OBD can tell you before you open anything, saves the whole afternoon.
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The fuel gauge lies: sender, float, or module
A needle that sticks or jumps almost always means the sender in the tank. The symptoms and why range estimates go wrong too.
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Bad fuel and misfuelling: what to do and what not to do
Filled up with the wrong fuel? The rule is do not start it. The symptoms of bad fuel, the difference between petrol in a diesel and the reverse, and what diagnostics shows.
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HVO diesel: what this fuel is and whether you can put it in your engine
Pumps increasingly carry an HVO or XTL marking. It looks like diesel, costs differently, and behaves slightly differently in an engine. What it is, who it suits, and what changes in the data.
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Fuel additives: which ones work and which ones sell hope
The additive shelf promises everything: clean injectors, raise octane, revive the catalyst. A breakdown by category — what has a physical mechanism, what works narrowly, and what cannot work at all.
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Plug-in hybrids: the hardest type of car to diagnose
Here you have everything at once: a combustion engine with a full emissions system plus a high-voltage drivetrain. And each half suffers because the other keeps working in its place.
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Wrong fuel in the tank: what to do in the first minutes to avoid paying for the fuel system
The cost of the mistake hinges on one decision — whether to start the engine. Both scenarios, why petrol in a diesel and diesel in a petrol are different orders of severity, and what diagnostics shows.
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A car after long storage: what to check before you turn the key
A car that sat for months breaks not from ageing but from stillness: the battery dies, discs rust, fuel degrades, calipers seize. The order for bringing it back.