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Toyota Service
Toyota Service, Toyota Expert
Category: Toyota
Satisfied Customers: 4915
Experience:  30+ Yrs of auto experience, Award Winning Svc. Manager; Just Answer Customer's Choice Award Winner
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Toyota 4 runner: I have a 2000 4 runner. Check engine light

Customer Question

I have a 2000 4 runner. Check engine light just came on
Submitted: 2 years ago.
Category: Toyota
Expert:  Toyota Service replied 2 years ago.
Hello. Welcome to Just Answer. Pleas allow me to assist you.
The check engine light comes on for many different reasons.
Please allow me to ask 2 questions to better assist you
1) is the vehicle running OK
2) did you purchase fuel recently?
Customer: replied 2 years ago.
Yes it is running well. Just bought fuel yesterday
Customer: replied 2 years ago.
Oil 1/2 quart low. Coolant a little low. Fixed thise
Expert:  Toyota Service replied 2 years ago.
Please look to see if the gas cap is as tight as possible.
If the cap is loose, the check engine light will come on. This is by design, as there is a sensor that measures fuel vapor pressure in the tank. If the cap is loose jut a bit, the vapor pressure escapes and this causes the light to come on.
Customer: replied 2 years ago.
I just took it off and put it back on
Customer: replied 2 years ago.
Started car and it is idling. Temperature gauge is good.
Expert:  Toyota Service replied 2 years ago.
If the cap was loose, this is what caused the light to come on.
Note that the light will not go out instantly if this was the problem. The vehicle needs to be driven over 2 drive cycles (start/warm up/run/shut off/cool down) before the system will reset.
You may have another problem, but, just getting gas yesterday and the light coming on today usually indicates a loose fit on the cap.
If you have any questions, please feel free to reply.
Thanks for choosing Just Answer. It was a pleasure to assist you today. I trust my input to your request is satisfactory to you and meets your expectations. A positive rating would be greatly appreciated for my assistance on your inquiry.
Thanks in advance and thank you again for choosing Just Answer
Customer: replied 2 years ago.
Thank you so much
Expert:  Toyota Service replied 2 years ago.
You are very welcome
As long as it is running ok, it was probably the cap issue.
If I were you, I would get the vehicle attached to a scanner to see exactly what caused the light to come on.
Thanks again for choosing Just Answer