So when I bought my IS a few months ago it had the tire pressure light on. I figured it just needed air. I plugged my motis in to it the other day and it was coming up with codes:
C2121 Transmitter ID1 not received
C2122 " " (ID2)
C2123 " " (ID3)
C2124 " " (ID4)
C2177 Initialization not complete

When I bought the car it was a recovered theft, the nav unit was missing out of the car (but replaced with a factory on)
I did the initialization process that was in the owners manual but that didnt work, I was wondering what you guys think it could be. I called lexus and they want 240 bucks to check all 4 tires. (NO THANK YOU)

Thanks in advanced
Mike

 

If you have to get it checked, go to toyota. They will do it cheaper.

 

depending on the year and model the nav ECU is tied with the tire pressure system ecu in a cluster. So if they replaced the nav. The tire pressure system needs to be programmed.

Thats your real issue