Lexus Troubleshooting Questions? Ask a Lexus Expert
Any recent work to this like valve covers, or spark plugs?
I'm questioning the ground on the back of the intake.
I would still check the ground on the back side of the intake manifold, this is known to give oxygen sensor and transmission sensor codes.
Yes sorry I had to step away from the computer for a bit, there is a ground wire that needs to be check to confirm whether is connected well, it is in the back center of intake manifold, I can send you a picture of it?
Ground location circled in red in first pic, arrow 1 points to the actually ground wire removed in picture.
Ground location shown in second picture( there is also circled in red one on the side of intake, wouldn't hurt to check that to)
They uploaded in a different order 1 is 2 and 2 is 1.
I've witnessed these grounds installed by a thread or two at time of repair then months/miles later the bolt backs out and losses connection when it falls out. This is commonly removed when doing spark plugs of valve cover gaskets. I would first eliminate this as a possibility before progressing any further in finding the cause of the check engine light.