Quote:
Originally Posted by 1helpfulhandyman
My 2004 Toyota Highlander was suddenly throwing a code saying the cat was bad. A $4.00 90 degree fitting to get the o2 sensor out of the exhaust stream fixed the problem. As some cars get older they sense the o2 is right on the line and throw the cat code. Just moving the sensor out of the direct exhaust flow solves the problem. You may have to drive a couple hundred miles until the computer resets the code and the light goes out. A 4 dollar part solved my problem instead of a new cat. You cant accurately diagnose the condition af a cat until you take it out and examine the inside. I would try the 4 dollar part first. Youtube it, theres plenty of videos about this quick fix.
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Thank you, tried this one, im down to the last move which is the cats