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Browse
Cars A–Z
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Fault Codes
By System
Powertrain
Body
Chassis
Network
Common Codes
P0420: Catalyst System Efficiency Below Threshold (Bank 1)
P0300: Random/Multiple Cylinder Misfire Detected
P0171: System Too Lean (Bank 1)
P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
Learn
Fault Code Lookup
OBD-II
Freeze Frame Data
How We Check What We Publish
See all →
Warning Lights
By Colour
Red
Stop When It Is Safe
Amber
Have It Checked Soon
Green
Information Only
Common Lights
Bonnet Open Warning
Boot Open Warning
Frost Warning (Snowflake)
Auto Hold
Hill Descent Control
Stability Control Off
See all →
Symptoms
By What You Notice
Noises
Smells
Leaks
Vibrations
Smoke
Starting Problems
Driving And Performance
Common
Car Brakes By Itself (Phantom Braking)
Reverse Camera Not Working
Phone Connection Keeps Dropping
See all →
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Filters
Brakes
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Your Car
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Battery And Electrical
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How To Replace A Fuse
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How To Clean Battery Terminals
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Medium
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