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I looked up in the manual and 2187 and 2189 are sort of companion codes. They mean that the fuel trims are so far out that they are uncorrectable to bring lambda to a 1 value. They are written to indicate a bad condition (either rich or lean) at an off idle under load (RKAT) or the lower range of the freeway driving speeds (FRAU). You must use the scanner to see what the fuel trims are at the RKAT and the FRAU load values. This will tell you whether you have a rich or lean condition.
Some of the items mentioned are (too rich) fuel pressure too high, leaking injector, maf sensor inaccurate; or (too lean) tank vent valve stuck open, sai valve leaking, fuel pressure too low, maf inaccurate.
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