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Check angine light and traction off light

(2002 Lexus IS300)
in Worcester, MA on July 29, 2009
My check engine light comes on when i start the car as well as the traction off light but the traction off light blinks while the check engine light stays on constantly. whats the worst case here for the symtoms.
Displaying 7 answers & 0 comments
Popular Answer
on July 29, 2009
When both lights are on, it makes me think that a sensor common to both systems (like a speed sensor) has failed. It's best to have a shop scan for the trouble code(s) stored in memory.
on December 25, 2009
happened to me as well on my is300 ...it was a o2 sensor. whenever the check engine light comes on the traction control automaticly shuts off. hope that helps.
on July 29, 2009
Ditto answer 2
on September 10, 2010
My is300 did the same thing and it started running about like a diesel. Well what it was was the head gasket went bad. It was leaking between the number 1 and number 2 cylinders. That's worst case scenario though.
on October 20, 2010
I just had this happen. Had a check engionelight come on, replaced the O2 sensor. Light came back on, then trac light also came on. The dealer said that the trac light is almost always nothing other than a more urgent message to get your check engine light looked at. FYI, my second light was a misfire right after the O2 sensor was replaced, which can happen when the system is re-learning with the new sensor.
on March 12, 2011
Cylinder misfire. Replace coil packs, wires & plugs & you'll be good to go.
on September 24, 2017
Yup, mine was a bad O2 sensor too. You guys left out one of the lights that comes on along with the CEL and TRAC (flashing) though. I also have my red BRAKE light come on in that scenario which makes it a total of 3 lights caused by a bad O2 sensor.
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