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Re: How many O2 sensors on a 1997 Lexus ES 300?
According to the manual i have... it has three.... one in the exhaust manifold.... and two in the exhaust pipe..... slightly vauge on the exact location of the last two sensors... but looks like it is after the catylitic converter.
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Code P0420 indicates cat convertoer efficiency below threshold. Sorry, but this usually means the cat is shot. Probably will need pro diagnosis, and if cat is indeed bad, have them try to figure out what killed it. Can be anything from misfires, to coolant getting in the combustion chamber. Outside chance of o2 sensor problem, but this one usually requires the sensors to be working correctly to set. Due to the diagnostics neccessary, probably you will save money by having it looked after by an experienced independant, who's familiar with this model.
take it to autozone and have them hook up the code reader. your on board computer stores the codes and you will know what the problem has been. but i think it might be your O2 sensor. but you need to hook it up to the reader first
your es acually has 3 o2 sensors. one of the ones you didnt replace may be bad, but then again a lot of things can make the check engine lite come on. recheck the plug connection on the one you changed and make sure its plugged in all the way. if it is you should have the vehicle scanned to pinpoint your other problem.
The O2 sensor goes in the exhaust pipe just below the exhaust manifold. That model may have an O2 sensor on each side of the engine, but they should be the only thing screwed into the exhaust pipe. And I would use TOYOTA brand parts or, if you have to replace it again,(and you probably would), you may have trouble getting it out.
There is one before each catalytic converter (usually up right near the exhaust manifolds), and one after each cat (or if you have a Y-pipe exhaust that brings the two sides together to one pipe and one converter, then there's one after that single converter). Why do you want to change them? Have you gotten failure codes or are you having poor gas mileage? Or have they just been in there a long time? They're usually good for about 60k miles, although of course they can fail early. Usually the symptoms are poor fuel economy, running rich (seen by black smoke out the tailpipes and some rough idling, as well as blackened spark plugs), or fault codes dealing with system-lean or system-rich descriptions. Those symptoms are indicative of bad primary O2 sensors (the ones closest to the engine). If your secondary sensor(s) are failing (the post-cat sensor or sensors) you'll trip a check-engine light warning you of poor catalytic converter efficiency.