jcaspar1
Enthusiast
Having trouble with smog and it seems one bank is running rich. Took it to the dealership and they flushed the injectors and told me the rear O2 sensors were reading funny. Said I should replace them as this could be part of the problem. My understanding is the rear O2 sensors were only to monitor the cats and had no effect on mixture. With no check engine light, is there any reason to change the rear O2 sensors??