99 ES300 Trac Off and Check Engine

[dank]

Any idea what's up with this? Check engine light and Trac Off are both illuminated. What could that mean? I double checked the Traction Control switch and its set to on. What gives?

[skperformance]

you have a problem that needs a obd2 scanner to solve

[AirGuardian]

Had the same problem. Went to the dealer to get the diagnostic computer check out. Turns out it was one of the 4 O2 sensors indicating a leaner than normal mixture was occuring! Dealer is replacing one of the rear sensors - it was malfunctioning and the engine is running fine regardless of the failed indicator. If it bugs you, you can disconnect the battery temporarily to see if it comes back - than go get it checked out to verify this info! You only lose traction control - My light came on every few hundred miles - heavy accelerating moments mostly!

[skperformance]

the trac light comes on whenever the Cel is on also

there are also only 3 o2 sensors in any 1mz-fe engine
2 before on each manifold and one after the cat

[alflash]

Hello,
Dear dank,
I think about System (TRC) on Yours Vehicle provide procedure for retrieving trouble codes without a scan tool (by short terminals Tc and E1 in DLC No.3 or DLC No.2).
Need read the throuble codes and check faulty "devices".
Best Regards,