1999 toyota tacomaFebruary 3, 2015Check engine light is on. What could be causing this? I checked oil ad was empty. Put in 3 bottles. Share Tweet Pinterest Keywords:Tacoma 1 thought on “1999 toyota tacoma” Freeautomechanic February 4, 2015 at 9:03 am You will need to have the check engine light codes pulled with a Scan Tool. No sense in guessing. Your local auto parts store will do this for free. Free is good! Post the codes below. Assuming the engine is running normal. If the check engine light is on and and not flashing, it is an emissions related issue and can be driven without worry. If the check engine light is flashing, DO NOT DRIVE IT. Something bad is wrong and you can cause damage if driven. Comments are closed.