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27 guides

Black removable fuel cap on a gray work surface.

Cars & OBD · P0442

P0442 Code: Small EVAP Leak, Checks and Repair Verification

P0442 reports a small EVAP leak. Preserve the scan results and confirm the vehicle-specific test finding before replacing caps, valves or a canister.

Closed booklet on a laundry countertop beside a washing machine.

Home appliances · CL

LG Washer CL Code: Find and Release the Control Lock

LG CL means Child Lock is enabled. Find the marked control on your model to unlock the buttons; switching the washer off may not clear the setting.

Single spark plug on a dark workshop mat.

Cars & OBD · P0301

P0301 Code: Cylinder 1 Misfire and the Next Diagnostic Steps

P0301 identifies a cylinder 1 misfire. Confirm the engine’s cylinder layout and diagnostic evidence before replacing a coil, plug or injector.

Water tap connected to a braided washing-machine inlet hose.

Home appliances · 4C

Samsung Washer 4C Code: Water Supply Checks That Matter

Samsung 4C or 4E indicates a water-supply problem. Check the tap and accessible inlet hose, then use your model manual for filter maintenance.

Closed fuel-filler door on a parked car.

Cars & OBD · P0456

P0456 Code: A Small EVAP Leak Needs a Confirmed Diagnosis

P0456 reports a very small EVAP leak. The code does not locate the problem; vehicle-specific testing should confirm the cause before parts are replaced.

Towels distributed around the centre of a top-loading washer basket.

Home appliances · UE

LG Washer UE Code: Balance the Load and Check Leveling

LG UE indicates an unbalanced load. Check how the laundry is distributed, the selected cycle and washer leveling before assuming a repair is needed.

Detached mesh dishwasher filter and soft cleaning brush beside a sink.

Home appliances · E22

Bosch Dishwasher E22: Filter Cleaning and Next Checks

Bosch E22 points first to a blocked filter. Clean and refit the filter using the instructions for your dishwasher, then investigate a persistent warning rather than assuming a pump needs replacing.

Closed coolant reservoir in an engine bay.

Cars & OBD · P0128

P0128 Code: Coolant Temperature and Thermostat Checks

P0128 means coolant stayed below the expected regulating temperature. Check the vehicle-specific diagnosis before replacing a thermostat.

Diagnostic scanner displaying P0174 and Bank 2 on a parked car’s passenger seat.

Cars & OBD · P0174

P0174 Code: System Too Lean on Bank 2 and What to Check Next

P0174 reports a lean condition on Bank 2. The useful next step is to preserve the diagnostic data and find out why fuel control has reached its limit, rather than choosing a sensor from the code alone.