99 lexus es 300 chk engine and trac lock lite on at same time???
I had check engine light and TRAC OFF. OBD-II MIL code was P1133 which is Air Fuel Ratio Sensor Response Malfunction and scanned by AutoZone. After disconnecting the battery for 10-15 minutes, the lights went off. I cleaned the gas cap and tightened it firmly. For the last 400 miles, the lights have not come back. When scanning using Snap-on one, no code was detected. I think gas cap was the reason for the lights.
Yes the gas cap if not on correctly or you need a new one will make the check engine light come on.
I had the same problem. I re tightened the fuel cap and after driving for some time, both the lights went off. Check your fuel cap, it might be loose.
U must have the electronic control module tested for the fault codes that are stored anytime the lights are turned on by the computer, there are 100's of poss fault codes so it is imposs to guess here.
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