Incredible 2002 Toyota 4Runner Check Engine Light On Ideas. The o2 sensor was replaced and all is well. Web the check engine light warns of issues ranging from a gas cap that's not properly tightened to a more relentless failure like a bad catalytic converter or a problem with one of the car's oxygen sensors, so it marvelous to get the accessible code reading and diagnosis.
The check engine light in the toyota 4runner acts as a warning indicator. Can anyone tell me what area of the car i should be looking at, or how to diagnose it further? Will i need to get a code reader, or are these the jump two pins and count the blinks variety?
