#maintenance
28 posts in Car Diagnostics blog about "maintenance" — OBD-II diagnostics, DTC codes, repair. ← All posts
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OBD for a small fleet: what to log and what to act on
Five vans and no workshop. The value is not in reading codes after a breakdown — it is in the trends that let you schedule work instead of reacting to it.
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Brake pads: organic, ceramic, or semi-metallic
Different friction materials balance stopping, dust, and noise differently. The types, and why more expensive is not always better.
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Balancing or alignment: two different symptoms people confuse
Vibration at speed and uneven tyre wear are different problems with different fixes. How to tell them apart.
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Air conditioning: how to use it so it cools better and lasts longer
A few habits give more cooling and longer life at no cost. Recirculation, modes, and running it in winter.
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Differentials and transfer cases: the units people remember after the whine
Axle and transfer case oil has a schedule that quietly gets skipped. Wear signs and why mismatched tyres destroy four-wheel drive.
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The oil filter: the wrong place to save money
A cheap filter saves a few coins and, in the bad case, costs an engine. What is inside and why the valves matter more than the can.
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The annual service: what is genuinely needed and what is sold on top
The list on a workshop invoice is usually longer than the schedule. What is mandatory, what is condition-based, and what is not needed at all.
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The cabin filter: the cheapest part, replaced least often
A blocked cabin filter is not only about smell. It cuts airflow, hurts the air conditioning, and mists the windows. Types and intervals.
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The CV boot: a cheap rubber gaiter the whole driveshaft depends on
A crack in a boot turns a cheap repair into a new driveshaft within weeks. The signs, the timescale, and why it cannot wait.
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What to tackle yourself and what to leave alone
The line runs not through difficulty but through the consequences of getting it wrong. What is safe to do yourself and where the cost of error dwarfs the saving.
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Spark plugs: when to change them and why "still working" is not an argument
A plug does not fail abruptly — it degrades, and the coil degrades with it. Types, intervals, and why a dearer plug is not always better.
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Wheel torque: why "as tight as it goes" costs more than a torque wrench
An overtightened wheel costs a rim, a stud, or judder under braking. Why torque matters and what to do after a tyre shop visit.
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The air filter: cheap, and it affects everything
A blocked filter does not merely "reduce power a little" — it changes the data the module calculates the mixture from. The real effects and the performance filter myth.
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Brake fluid: why it is changed by the calendar, not by mileage
Fluid absorbs water even while parked, and that is what makes it dangerous exactly where brakes matter most. Grades, testing, and consequences.
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Coolant: why colours must not be mixed and what to do if they were
Coolant colour guarantees nothing — the additive package is what matters. The types, the consequences of mixing, and how it shows up in diagnostics.
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The fuel filter: symptoms of a blockage and why diesel is a special case
A blocked filter shows up under load and at high revs. The symptoms, and why on a diesel the question is more expensive.
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The handbrake will not hold: cable and electronic parking brakes
Most people test the parking brake once a year, at the annual inspection. Why cables stretch, how an electronic parking brake differs, and why winter use needs care.
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Oil change intervals: why the schedule and reality disagree
The schedule was not written for your route. What "severe conditions" means, why it applies to most drivers, and how to work out an honest interval.
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The auxiliary belt: squeal, cracks, and why a snap stops the car
The accessory belt drives the alternator, water pump, and steering. The wear signs and what happens the moment it snaps.
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Automatic transmission fluid: "filled for life" and the other myths
A "lifetime fill" means the life the manufacturer assumed, not yours. When to change it, how a partial change differs from a full one, and why the fear is misplaced.
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Nothing but short trips: why that is the hardest regime for an engine
Two miles to work looks harmless, yet it is the hardest possible duty cycle. What accumulates in the engine and what to do about it.
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Timing belt or chain: what actually matters when buying and servicing
A "lifetime" chain is marketing, not a fact. Real service life, the signs of stretch, the cost of getting it wrong, and what diagnostics shows.
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Choosing engine oil: why the approval matters more than viscosity or brand
A bottle carries three groups of markings and they are not equivalent. Viscosity says how the oil flows. The approval says whether it suits your engine. Confusing them costs a particulate filter or a cam phaser.
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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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Air conditioning smell: where it comes from and why the spray can does not fix it
That musty smell when the fan starts is biofilm on the evaporator. Why it grows there, why aerosols buy you two weeks, and one free habit that solves it permanently.
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How often to run diagnostics: a schedule that makes sense, not "once a year just in case"
An annual scan catches what has already happened. A schedule built around pending codes and events catches what is about to happen — and that is the difference between prevention and repair.
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Kia Rio: what fails at which mileage — a schedule rather than a list
The Rio shares its engine family with the Hyundai Accent, so the parts list is common to both. The difference is when each item appears — and that schedule is more useful than the list itself.
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Engine Oil and OBD-II: P0520–P0523, Oil Life Monitor and Codes Caused by Bad Oil
OBD-II oil pressure codes P0520, P0521, P0522: how Oil Life Monitor (GM OLS, BMW CBS, Ford ILM) relates to OBD-II, which DTC codes are early warnings of degraded oil — VANOS P0011, timing chain P0016, P0087.