Question about 1997 Toyota Previa

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Previa 2001 i change the oil (5w30 with aditiv )cooling liquid ,filtrs,sparks,service for 145000km the engine is running very well gas test ok but after 1000km a light on board show failure engine . service change O2 sensors after 100km the light appear again service told me to change catalitic.what is happened? IT IS NORMAL?

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Hi, this is very normal the chances are your O2 sensors where ok and it was just the cat causing the problem, if the cat is giving the wrong gasses out then this will cause the O2 sensor to seem as if they are faulty, so the warning you get is bad O2 sensors but the fault may well have just been the cat, get the cat changed and you should find you will have no further problems.
Plus as you have changed the sensors then this would rule out them causing you problems in the near future.

once the cat has been sorted the sensors will pick up the correct mixture from the cat and this will then stop the warning lights coming on and it will also make your car run a lot smoother and use less fuel

let me know if you need further assistance ok

plz rate this solution as i have a whole page of unrated posts, thanks

Posted on Sep 10, 2010

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