Question about 1999 Toyota 4Runner
Sounds like a O2 sensor is triggering a code. If the sensor got wet it could cause a accidental trouble code to come on. The first thing you should do is to unplug the battery, which should turn the Check Engine light off, if it comes back on then have a mechanic diagnose the problem and replace the faulty part. If it stays off, then be glad you didn't fix a problem that didn't exist.
Posted on Dec 05, 2010
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Posted on Jan 02, 2017
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The engine and transmission in this cars drive train are fully electronically controlled by a computer called the PCM (Power Train Control Module). Whenever a problem like this occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPEDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM
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