2002 Corolla. Yellow check engine came on. 1st mechanic said it was the catalytic converter. Cleared code. 2nd mechanic said it was not. No code came up. The dealer could not find the code either. 5 months later, the light came on again. What gives?
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Wind Song
ANSWERS: 4
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Not surprising they found nothing with the light off. Now that it's back on take it in and see what they say. They'll hook up to the computer and see what it has to say for itself.
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The most common cause of check engine lights is a loose or leaking fuel cap. If the light only comes on that infrequently that could be ypur problem. If you go to a major auto parts store they can pull the codes as well and will normally do it for free. If the code is something to do with an Evap Leak the fuel cap can be the problem. Check the cap and have them clear the codes. The vehicle doesn't check for the problem if the gas tank is really full or really empty so it is hard to associate the loose cap and the light sometimes. If the light is on and you tighten the cap it will eventully turn off. It may still be another problem but a loose gas cap is very common.
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defect sensor,replace with new sensor.
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Thanks for your input. Paid the 1st mechanic $35 and the dealer charges $90 to pull the coded. I don't if I can trust any mechanic anymore other than the dealer. I would have been very upset if I had to pay $500 to have the catalytic converter changed and found out it wasn't the problem. The car has only 95,000 miles on it. This morning, I filled up the gas, cleaned and tightened the gas cap, making sure it is straight. Added a quart of motor oil. The solid yellow CE ight is still on. Plan to take it to an auto parts store and have it checked. Will also read the manuals, check all fluid levels and look under the hood. Any other suggestions? Both times, it happened in Oakland when the weather was cold and it was drizzling (I used to live in San Diego, CA). Does the weather have any thing to do with it?
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