Check Engine Light Stays On

Book says "take to Toyota Dealer" . I just changed 6 plugs in my 2006 Tacoma using the fantastic photo how-to instructions on this forum. Truck appeared to have the original plugs at 86,000 miles. Now it has new recommended Denso plugs. Having done that, it runs great... excepting for the "warning indicator". I have tripple checked all that I removed and replaced to r & r the plugs. OK. Any advice or ideas here that don't involve the Toyota Dealer $hop? What to do?

 

Go to the local autozone and they can scan it for free for ya it will probly come up with a misfire, if so take note of which cylinder and clear codes and see if they come back if so then a spark plug wasn't put in tight enough or a plug to the spark plug vonnection isnt there. Gl