The computer has picked up on a problem in the engine that needs your attention. Could be bad could be just attention is needed. You need to check the code to be sure. If you go to the local parts store they will probably check the code for free and tell you what it is. Then gladly sell you the part that can fix it.
Type your answer here... Hello how do you reset the check engine light on a 2003 Toyota 4runner. Thanks
http://www.extreme-check-engine-light-codes.com/Toyota%20OBD1%20Decoder.htm
check the gas cap it may not be on tight
you would have code "pending" and a check engine light
Check engine lights will not turn off in a vehicle until they are reset. To reset the light on a 1994 Toyota Tercel pull the ECU fuse.
Check the four fuses that are behind the seat that support the boat trailer lights.
Sorry need a few more details. What model 4 runner do you have and what year? What is the engine size?
Every vehicle has warning lights to inform the driver of things going on. The check engine light comes on because there is something going wrong with the engine.
open fuse box remove efi [fuel injector fuse for about10 seconds
remove the efi fuse for 1 minute if the light comes back on you have a problem
The cigarette lighter is commonly wired into something else. Check the dash lights and tail lights, as they are the two most common places to connect the lighter to.
A compression check and cylinder leak-down test should tell you the condition of your engine.