Car Parts Buying Guides
Not sure which part you need? Our buying guides explain what to look for, when to replace, and how to choose the right component for your vehicle.
Original researchUK Car Parts Price Index 2026: Brake Pads & Discs
Front brake pads and discs for Britain's 30 most common cars: cheapest and typical UK prices, brand price gaps and OE-supplier premiums. Data as of 29 Sep 2026.
Read the research →Brake Pads Buying Guide
How to choose the right brake pads — signs of wear, organic vs ceramic vs semi-metallic, and replacement tips.
Read guide →Brake Discs Buying Guide
Vented, solid, or drilled? Learn when to replace brake discs, minimum thickness, and how to pick the right type.
Read guide →Oil Filter Buying Guide
Why oil filters matter, how often to change them, and how to find the right one for your engine.
Read guide →Air Filter Buying Guide
Signs of a clogged air filter, paper vs cotton, and how replacing your air filter improves fuel economy.
Read guide →Spark Plugs Buying Guide
Copper, platinum, or iridium? Understand heat ranges, gap settings, and when to replace spark plugs.
Read guide →Wiper Blades Buying Guide
Conventional, flat, or hybrid wiper blades — fitting types, sizing, and when to swap them out.
Read guide →Shock Absorbers Buying Guide
Twin-tube vs monotube, gas vs oil — signs your shocks are worn and how to choose replacements.
Read guide →Car Battery Buying Guide
CCA ratings, battery group sizes, AGM vs EFB — everything you need to choose the right car battery.
Read guide →Timing Belt Buying Guide
Replacement intervals, interference vs non-interference engines, and why timing belt failure is catastrophic.
Read guide →Clutch Kit Buying Guide
Full kit vs disc only, DMF inspection, and signs your clutch is slipping or worn.
Read guide →Headlight Bulbs Guide
H1, H4, H7 — find the right bulb type, understand LED upgrades, and learn why you should replace in pairs.
Read guide →Cabin Filter Guide
Standard vs activated carbon cabin filters — replacement intervals, symptoms, and allergy benefits.
Read guide →Control Arms Guide
What control arms do, symptoms of worn bushings and ball joints, and when to replace them.
Read guide →Wheel Bearings Guide
Humming, droning, grinding — diagnose a bad wheel bearing and understand replacement options.
Read guide →Engine Thermostat Guide
Stuck open or stuck closed? Learn how thermostats work and when to replace yours.
Read guide →Alternator Guide
Alternator vs battery — how to diagnose charging faults and choose the right replacement.
Read guide →Radiator Guide
Signs of a leaking radiator, repair vs replacement, and how to prevent overheating.
Read guide →Starter Motor Guide
Clicking when turning the key? Diagnose starter motor issues and find the right replacement.
Read guide →Water Pump Guide
Belt-driven vs electric water pumps — failure symptoms, replacement intervals, and timing belt links.
Read guide →Ignition Coils Guide
Misfires and rough idle? How to identify a faulty coil with an OBD scanner and decide on replacement.
Read guide →Fuel Pump Buying Guide
Electric and mechanical fuel pumps — failure symptoms, replacement advice, and how to choose the right pump for your vehicle.
Read guide →Lambda Sensor Buying Guide
Pre-cat and post-cat oxygen sensors — diagnostic codes, emissions impact, and choosing direct-fit vs universal.
Read guide →Drive Belt Buying Guide
Serpentine and auxiliary belt replacement — signs of wear, tensioner advice, and what happens when a belt snaps.
Read guide →Brake Caliper Buying Guide
Seized or leaking brake calipers — symptoms, slide pin maintenance, and when to repair vs replace.
Read guide →Turbocharger Buying Guide
Turbo failure symptoms, oil supply essentials, and choosing between new and remanufactured turbochargers.
Read guide →EGR Valve Buying Guide
Exhaust gas recirculation explained — carbon build-up causes, cleaning vs replacement, and emissions inspection rules.
Read guide →Mass Air Flow Sensor Guide
MAF sensor faults — P0100 codes, cleaning tips, and how a faulty MAF affects fuel economy and performance.
Read guide →Fuel Injector Buying Guide
Petrol and diesel injectors — misfire diagnosis, injector coding, and maintenance tips for long injector life.
Read guide →Catalytic Converter Buying Guide
P0420 codes, emissions failures, and type-approval rules — how to choose a legal replacement catalytic converter.
Read guide →Steering Rack Buying Guide
Hydraulic and electric steering racks — leak diagnosis, remanufactured options, and alignment after replacement.
Read guide →CV Joint Buying Guide
Clicking on turns? Diagnose CV joint and driveshaft faults — boot replacement vs complete shaft options.
Read guide →Suspension Spring Buying Guide
Coil spring breakage, sagging ride height, and corrosion — replacement advice and spring types.
Read guide →Engine Mount Buying Guide
Excessive vibration and clunking? Diagnose worn engine mounts — rubber vs hydraulic and replacement tips.
Read guide →Glow Plug Buying Guide
Diesel cold-start problems — glow plug failure symptoms, removal tips for seized plugs, and replacement advice.
Read guide →ABS Sensor Buying Guide
ABS and ESC warning lights — wheel speed sensor diagnosis, reluctor ring checks, and replacement guide.
Read guide →Tie Rod End Buying Guide
Loose steering and inspection failures — tie rod end symptoms, replacement tips, and alignment essentials.
Read guide →Window Regulator Buying Guide
Electric window stuck or fallen? Cable and rail regulator types, motor replacement, and fitting guide.
Read guide →Ball Joint Buying Guide
Clunking suspension and inspection failures — press-fit vs bolt-on ball joints, wear signs, and replacement advice.
Read guide →Exhaust System Buying Guide
Blowing exhaust, rust, and inspection failures — section-by-section replacement, mild steel vs stainless options.
Read guide →Power Steering Pump Buying Guide
Whining noise and heavy steering — pump failure diagnosis, system flushing, and fluid specification guide.
Read guide →Clutch Disc Buying Guide
Organic vs ceramic clutch disc materials — signs of slipping, juddering, and when to replace alongside the pressure plate.
Read guide →Flywheel Buying Guide
Single-mass vs dual-mass flywheel — DMF failure symptoms, resurfacing limits, and replacement cost factors.
Read guide →Drive Shaft Buying Guide
Vibrations at speed and clicking on turns — how to diagnose drive shaft faults and choose between new and reconditioned units.
Read guide →Differential Buying Guide
Whining rear end and limited-slip basics — differential oil types, common faults, and replacement vs rebuild options.
Read guide →Door Handle Buying Guide
Broken or stiff door handle? Interior vs exterior types, common failure points, and fitting tips for all car makes.
Read guide →Wing Mirror Buying Guide
Electric, heated, and folding wing mirrors — glass replacement vs full unit, and colour matching tips.
Read guide →Bumper Buying Guide
Front and rear bumper replacement — primed vs painted, sensor cutouts, and how to ensure a perfect fit.
Read guide →Headlight Housing Buying Guide
Halogen, xenon, and LED headlight units — lens clarity, projector vs reflector, and E-mark compliance.
Read guide →Tail Light Buying Guide
Cracked or foggy rear lights? OEM vs aftermarket tail light units, bulb types, and MOT compliance.
Read guide →Wiper Motor Buying Guide
Front and rear wiper motor faults — slow wipers, intermittent operation, and motor replacement steps.
Read guide →Expansion Tank Buying Guide
Coolant loss and cracked tanks — how to spot a failing expansion tank, pressure cap types, and replacement guide.
Read guide →Intercooler Buying Guide
Air-to-air vs air-to-water intercoolers — boost leak diagnosis, core damage signs, and upgrade options.
Read guide →Radiator Hose Buying Guide
Upper and lower radiator hose replacement — swelling, cracking, and how to choose the right material and size.
Read guide →DPF Filter Buying Guide
Diesel particulate filter regeneration, blockage symptoms, and when cleaning vs replacement makes financial sense.
Read guide →Exhaust Manifold Buying Guide
Cracked manifold symptoms, exhaust leaks, and cast iron vs stainless steel manifold replacement options.
Read guide →Muffler Buying Guide
Rear, middle, and front muffler types — noise regulations, corrosion, and universal vs direct-fit replacements.
Read guide →Horn Buying Guide
Disc, fanfare, and air horns — wiring basics, relay upgrades, and MOT requirements for horn operation.
Read guide →Window Motor Buying Guide
Electric window motor diagnosis — slow operation, clicking noises, and motor vs regulator replacement.
Read guide →Ignition Switch Buying Guide
No-start faults, intermittent power loss, and key won't turn — how to diagnose and replace a faulty ignition switch.
Read guide →Throttle Body Buying Guide
Electronic throttle body cleaning vs replacement — idle problems, throttle position sensor faults, and adaptation.
Read guide →Fuel Tank Buying Guide
Rust, leaks, and fuel contamination — steel vs plastic fuel tanks, capacity specs, and replacement precautions.
Read guide →Gearbox Mount Buying Guide
Vibration, clunking on gear change, and excessive movement — how to diagnose worn gearbox mounts and choose replacements.
Read guide →Clutch Slave Cylinder Buying Guide
Soft pedal, fluid loss, and gear selection issues — slave cylinder diagnosis, bleeding procedure, and replacement advice.
Read guide →Clutch Master Cylinder Buying Guide
Clutch pedal sinks to the floor? Master cylinder leak symptoms, brake fluid compatibility, and replacement steps.
Read guide →Anti-Roll Bar Link Buying Guide
Knocking over bumps? Anti-roll bar drop link wear symptoms, replacement tips, and how they affect handling.
Read guide →Anti-Roll Bar Bush Buying Guide
Worn anti-roll bar bushes cause clunks and body roll — polyurethane vs rubber, sizing, and fitting guide.
Read guide →Top Mount Buying Guide
Creaking on turns and knocking over bumps — strut top mount bearing failure, symptoms, and replacement with shocks.
Read guide →Brake Hose Buying Guide
Spongy pedal and MOT failures — rubber vs braided steel brake hoses, swelling diagnosis, and replacement intervals.
Read guide →Brake Drum Buying Guide
Rear brake drum wear limits, scoring diagnosis, and when to machine vs replace — a guide for drum brake vehicles.
Read guide →Handbrake Cable Buying Guide
Handbrake won't hold on hills? Cable stretch, seized mechanisms, and replacement tips for parking brake cables.
Read guide →Blower Motor Buying Guide
No air from the vents? Blower motor failure diagnosis, resistor module faults, and replacement guide.
Read guide →Heater Resistor Buying Guide
Fan only works on max speed? Heater blower resistor faults explained — testing, symptoms, and replacement steps.
Read guide →Door Lock Actuator Buying Guide
Central locking not working on one door? Actuator motor faults, wiring issues, and step-by-step replacement guide.
Read guide →Brake Master Cylinder Buying Guide
Spongy or sinking brake pedal? How to diagnose a failing brake master cylinder, bleed the system, and choose the right replacement.
Read guide →Brake Shoe Set Buying Guide
Rear drum brake shoes — lining materials, wear limits, self-adjusting mechanisms, and how to replace brake shoes safely.
Read guide →Brake Fluid Buying Guide
DOT 3, DOT 4, DOT 5.1 explained — dry and wet boiling points, hygroscopic ageing, and when to flush your brake fluid.
Read guide →Clock Spring (Airbag Spiral Cable) Buying Guide
Airbag warning light, horn failure, and cruise control loss — how a faulty clock spring is diagnosed and what to check before replacement.
Read guide →Tyre Pressure Monitoring Sensor (TPMS) Buying Guide
TPMS warning light, direct vs indirect systems, and what to do when replacing tyres — choosing compatible TPMS sensors.
Read guide →Crankshaft Position Sensor Buying Guide
No-start, misfires, and sudden engine cut-out — how the crankshaft sensor works, fault codes, and choosing the correct replacement.
Read guide →Coolant Temperature Sensor Buying Guide
Incorrect temperature gauge, poor fuel economy, and cooling fan issues — diagnosing a faulty coolant temperature sensor and selecting a replacement.
Read guide →Camshaft Position Sensor Buying Guide
P0340 fault codes, misfires, and rough running — how camshaft sensors control valve timing and when to replace them.
Read guide →Air Conditioning Compressor Buying Guide
No cold air, clutch not engaging, and seized compressors — A/C compressor types, oil charging requirements, and new vs remanufactured options.
Read guide →Intake Air Hose Buying Guide
Cracked or collapsed intake hoses cause poor performance and false MAF readings — how to inspect, diagnose, and replace rubber air intake ducting.
Read guide →Sports Air Filter Buying Guide
Cotton gauze vs foam vs paper performance filters — real-world power gains, oiling intervals, and whether a sports air filter improves fuel economy.
Read guide →Fuel Filter Buying Guide
Petrol and diesel fuel filters — blockage symptoms, in-line vs in-tank designs, replacement intervals, and water-separator maintenance for diesel.
Read guide →Fuel Pressure Regulator Buying Guide
Hard starts, black smoke, and fuel smell — how a fuel pressure regulator works, failure symptoms, and replacing it without damaging injectors.
Read guide →Timing Chain Kit Buying Guide
Chains vs belts, tensioner rattle on cold start, and stretched chain symptoms — when to replace a timing chain kit and what the job involves.
Read guide →Water Pump and Timing Belt Kit Buying Guide
Why replace the water pump with the timing belt? Combined kit advantages, service intervals, and what to check when buying an all-in-one kit.
Read guide →Coolant Flange Buying Guide
Coolant flanges, thermostat housings, and outlet pipes — plastic vs aluminium, common failure modes, and correct sealant for leak-free installation.
Read guide →Engine Oil Cooler Buying Guide
Water-cooled vs air-cooled oil coolers, oil-in-coolant mixing symptoms, and how to choose and fit a replacement oil cooler without disturbing the coolant system.
Read guide →Steering Column Buying Guide
Collapsible, tilt, and telescopic steering columns — fault symptoms, MOT implications, and choosing between complete assemblies and individual column components.
Read guide →Steering Angle Sensor Buying Guide
ESC and traction control faults caused by steering angle sensor errors — calibration requirements, fault codes, and replacement guide.
Read guide →Manual Gearbox Buying Guide
Crunching gears, oil leaks, and whining noises — diagnosing manual gearbox faults, the case for reconditioned vs new units, and oil specification.
Read guide →Automatic Gearbox Buying Guide
Slipping, harsh shifts, and TCU faults — how automatic transmissions fail, fluid service intervals, and when to rebuild vs replace your gearbox.
Read guide →Clutch Release Bearing Buying Guide
Squealing when pressing the clutch pedal — identifying a worn release bearing, replacing it alongside the clutch kit, and avoiding premature failure.
Read guide →Suspension Strut Buying Guide
MacPherson struts vs separate shock and spring — when to replace as a complete assembly, loaded vs bare struts, and corner-by-corner replacement tips.
Read guide →Boot and Bonnet Gas Strut Buying Guide
Tailgate or bonnet not staying up? How to measure force rating, strut length, and ball-end fittings — and why cheap gas struts fail quickly.
Read guide →CV Boot Buying Guide
Split or cracked CV boots lead to joint failure — how to spot grease flinging, boot types and sizes, and replacing a boot without removing the driveshaft.
Read guide →Engine Oil Pump Buying Guide
Low oil pressure warning, noisy engine, and bearing wear — oil pump failure causes, pressure testing, and what to do when the pick-up tube is clogged.
Read guide →Head Gasket Buying Guide
Overheating, milky oil, and white exhaust smoke — identifying a blown head gasket, multi-layer steel vs composite types, and what the repair involves.
Read guide →Crankcase Ventilation (PCV) Valve Buying Guide
Oil leaks, high oil consumption, and rough idle — how the PCV valve prevents pressure build-up, clogging symptoms, and easy replacement steps.
Read guide →Intake Manifold Swirl Flap Buying Guide
Broken plastic swirl flaps can enter diesel engines and cause catastrophic damage — fault codes, removal options, and choosing a replacement kit.
Read guide →Oil Separator (Catch Can) Buying Guide
Excessive oil consumption and carbon build-up on intake valves — how an oil separator or catch can works, fitting guide, and which engines benefit most.
Read guide →