Wideband cold start

How reliable is the wideband during cold startup? I've noticed that my wideband will read 10% leaner than commanded. If I take control of the commanded afr in the scanner I can richen up my mixture. Just want to make sure i dont need to adjust my OLFA at all.

The wideband should be perfectly accurate irrespective of the engine temperature. It's also very normal for the engine to run leaner than target during cold start if your warmup enrichment maps aren't properly dialled in. It sounds to me like this is the situation.