Land Rover Repair: 97 DISCO Check Engine Light - CODE P1138, o2 sensors, oxygen sensor

Question
Hello - I just replaced my CAT Converters (Y-pipe) and all four o2's per dealers diagnostics.

But, Check Engine light is still on with Code P1138 - Oxygen sensor Engine Rich.  Not sure what else to do?  

Answer
A code for rich running does not indicate bad catalysts or o2 senors.  The code means that the o2 sensors are detecting a rich condition.

That could be a result of excessive fuel pressure; ignition misfire; a bad temp sensor; or any number of issues.

If you replaced a catalyst or o2 sensors for the code you told me about that sounds like a misdiagnosis, or else they were damaged and needed to be changed for a different reason.