OBD-II codes explained — can I keep driving?
OBD Code Guide publishes plain-English guides to common diagnostic trouble codes. Each page leads with a Green / Yellow / Red answer on whether you can keep driving. This is not certified repair advice and does not guarantee any repair.
Green — conditional short trips
Yellow — limited / limp to shop
Red — stop when safe
Generic codes
- GenericP0420Catalyst efficiency (Bank 1)
- GenericP0430Catalyst efficiency (Bank 2)
- GenericP0300Random / multiple misfire
- GenericP0301Cylinder 1 misfire
- GenericP0171System too lean (Bank 1)
- GenericP0174System too lean (Bank 2)
- GenericP0172System too rich (Bank 1)
- GenericP0455EVAP large leak
- GenericP0128Coolant below thermostat temp
- GenericP0335Crankshaft position sensor circuit
- GenericP0700Transmission MIL request
Code × model notes
- Code × modelP0420 · Toyota CamryCode × model
- Code × modelP0420 · Ford F-150Code × model
- Code × modelP0300 · Ford F-150Code × model
- Code × modelP0455 · Chevy SilveradoCode × model
- Code × modelP0171 · Honda CivicCode × model
- Code × modelP0171 · Ford F-150Code × model
- Code × modelP0300 · Chevy SilveradoCode × model
- Code × modelP0128 · Toyota CamryCode × model
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