#fuel consumption
9 posts in Car Diagnostics blog about "fuel consumption" — OBD-II diagnostics, DTC codes, repair. ← All posts
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Real driving emissions: why lab figures never matched your car
The gap between official figures and reality was not a rounding error. RDE testing exists because the old laboratory cycle could be engineered around.
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Fuel economy myths: seven tips that do not work
Some popular economy advice achieves nothing and some works in reverse. Seven of the most common, with the mechanics explained.
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Fuel economy: what actually works and what is a myth
Most economy tips deliver nothing or make things worse. What genuinely affects consumption, in order of payback.
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Do you need to warm the engine up? What live data says instead of opinions
The warm-up argument has run for decades on conviction alone. But the control module shows exactly what happens on a cold engine — and that settles most of both sides' arguments.
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Fuel consumption is up: telling normal variation from a real fault in ten minutes
Consumption depends on season, driving style, and route — and those three explain up to 30 % of the difference. How to filter out normal variation, and the three parameters that answer the question.
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Nissan Almera: simple faults on a simple car, and where the fuel consumption hides
The Almera was deliberately built simple, and that shows in its fault list: almost everything is found with a basic adapter. The most frequent codes, and why consumption rises with no lamp at all.
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P0113 and P0118: temperature sensors — cheap parts that cost you fuel
A sensor costing a few dollars can raise consumption by a third, ruin starting, and break the cooling fan. The two most important temperature sensors, and why their failures are so easy to miss.
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P0172 and P0175: rich mixture — why it smells of fuel and where the fuel goes
The mirror image of P0171: too much fuel, and the module cannot remove enough of it. The causes, why the catalyst suffers, and how a rich mixture kills an engine through its oil.
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Fuel Consumption Went Up: 12 Causes and How to Diagnose via OBD-II
Sudden fuel-use increase: which DTC codes and live parameters to watch, how to distinguish worn engine from a clogged filter.