I just had an engine replaced along with a valve job in a 97 disco V8. Landy seems to be idling rough, which was not the case prior to the work being completed. Suggestions? Thanks for your assistance and candid advice.

Thanks for the information, what do I need to do remedy the situation? P0138 - Oxygen sensor circuit high voltage,downstream sensor,bank A. P01193 - Oxygen sensor heater circuit inferred open circuit downstream sensors.

I am new to this forum and I wanted to see if anyone would be willing to decipher the follow two OBDII codes for a 1997 Land Rover Discovery. My check Engine light has illuminated and the OBDII codes are: P0138 P01193 To what are they referring? What do I need to do to correct the issue(s)...