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P2100–P2199 fault codes
8 codes in this range have a plain-English write-up, checked by a person.
P2177P2177: your engine is running lean off idleP2178P2178: your engine is running rich off idleP2179P2179: bank 2 is running lean off idleP2180P2180: bank 2 is running rich off idleP2187P2187: your engine is running lean at idleP2188P2188: your engine is running rich at idleP2189P2189: bank 2 is running lean at idleP2190P2190: bank 2 is running rich at idle