Question about Toyota 4Runner

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My 1993 Toyota 4runner will not pass smog.The check engine light has been on for some time now. I went to a shop to have it cleared and the mechanic only reset the computer not clear it.I was ordered to a gold or test only shop.The technician at the smog shop told me instantly i had a bad engine or a few bad cylinders. Went back to same guy with code reader and after a 4 hour bill i was told i needed a head gasket job.I learned by watching him how to reset fuse for check engine light.When i reset fuse the truck runs great.As soon as light comes back on: and this varies sometimes 40 miles sometimes 135 miles etc....I paid the tags way in advance not ever thinking the truck would fail smpg.I purchased the truck used from a Toyota Dealer here in town.I got an extension on tags so im ok right now.Head job is estimated to cost 1,000 +++I am not working right now and im out of hope and cash?? Please Help

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Most likely the problem is a bad O2 Sensor. In any case a head gasket will run about $20 and 6 hours of work to replace but I doubt very seriously that is the problem. The check engine light keeps returning because the problem is still present that caused it to activate in the first place. it doesn't matter how many times you reset it. I would start by replacing the O2 Sensor, assuming the vehicle has one. If it doesn't have an O2 Sensor then you need to look at the Map Sensor or Catalytic Convert as being possible problems. If the engine runs better after you clear the code though until the code returns then I wold bet the problem is the Oxygen Sensor more commonly known as the O2 Sensor. They run about $40 at Auto Zone.

Posted on Oct 07, 2010

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