https://docs.emtronaustralia.com.au/engine-management/functions/lambda-control/lambda-transport-delay-guide/index.htmlLambda Transport Delay Tuning Guide The Lambda Closed Loop system is a fairly standard PID routine (with Proportional, Integral, and Derivative gains). See the Lambda Control - Wide Band section for more details However, for it to function correctly, latency from o2 sensors signals must be programmed/tuned into the ECU system. This is known as “Lambda Transport Delay” ** Physical location/distance from the engine or pre-/post-turbo configuration of o2 sensors will affect transport delayHugoen-us