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.
Find the meaning. Know your next step.
Appliance & car error codes
Understand the warning and find the next checks for your appliance or car.
Understand the warning
Explore the error code guides
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.
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.
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.
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.
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.
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.
Home appliances · IE
LG Washer IE Code: Water Inlet Checks and When to Call for Service
An LG washer IE code means the tub has not received enough water within the allowed time. Start with the supply taps and hoses; a restricted inlet filter or an incorrectly positioned drain hose can also affect filling.
Cars & OBD · P0171
P0171 Code: System Too Lean (Bank 1), Causes and Next Steps
P0171 means the engine control system has detected a lean condition on Bank 1. An air leak can be responsible, but the code does not identify a failed oxygen sensor or a specific replacement part.
Have the code but not the model?
Start with the brand and the full message on the display. Each guide identifies the appliances or vehicles it covers, so you can check the match before following any steps.
Search the code library