Fault Code Comparison
Compare two OBD-II fault codes: meaning, risk, system and possible causes, with the causes they share marked.
Tool
How to use it
Enter two codes from your scanner, for example P0171 and P0300, and press Compare. Causes that appear for both codes are marked; they are often the best place to start.
How it is calculated
The comparison uses the published PitClue pages of both codes. Shared causes are matched by name. Two codes stored together do not always share a cause; the diagnosis steps on each page show how to check.