Excellent video from @gloverman may be of help!
Many have asked for o2 sensor locations (both primary and sub) on the LS400 and Kelvin shows you exactly where they are. (I think some call them lambda?) Remember that the sub oxygen sensors monitor the catalytic converter, not fuel mixtures.
Kelvin and John replace the original Toyota sensors with Denso. You're not going to see many engine bays this clean.
Last edited: