Question about 2000 Toyota Corolla

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Did a diagnostic check and code p0170 came up the definition for this says its -fuel trim, when i look in the haynes manuel i cant find anything for it under fuel trim, SO what is this and how do i solve the problem so the MIL light doesnt come on again as iv turned it off. is it easy to fix as im no mechanic and if i cant fix it is it going to cost me loads any help appreciated im driving a 1.3 toyota corolla my email is ssideburns@hotmail.com

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I would start with the Mass Air Flow sensor.  It is located between the throttle body and the air filter case. You will see it has a plug in the side. Unplug and remove it by taking the hose clamps off each end. Once you have it out, clean it out with a good throttle body/intake cleaner. Allow it to dry and reinstall. If the light continues to come on, you will need to replace it. Cleaning has worked for some.  Do this and reset the codes.  If this the codes come back, I would probably look at the oxygen sensors, you have two.  Let me know if cleaning it doesn't fix it.

Posted on May 17, 2009

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