1996 Lexus ES 300. The check engine light has been on for a year. First code was O2 sensor- replaced, second catalytic converter - replaced. Now getting EGR valve plus catalytic converter. Nothing seems to work. This is getting very frustrating and tired of just replacing parts and getting new codes.

SOURCE: 2002 es 300 lexus

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.

SOURCE: 1999 lexus es 300 cat converter im told its a

at the dealer it sound right but if it is dealer id take it somewere else. a cat converter can cost up to $300 alone but it sounds like there charging you triple labor. here how much i think the part costs http://www.partsgeek.com/gbproducts/YN/E7523-OES-H3000.html?utm_source=google&utm_medium=ff&utm_term=99+1999+Lexus+ES300+Catalytic+Converter+OES+Genuine+Front+Lexus+Catalytic+Converter+To%3A07-31-99&utm_content=YN&utm_campaign=PartsGeek+Google+Base

SOURCE: 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.

Greg Bernett

• 2993 Answers
• Posted on Jul 12, 2009

SOURCE: location of fuel filter on 2000 lexus es 300

The fuel filter on the ES300 is located under the hood, on the driver's side, by the fenderwell.

SOURCE: 99 lexus es 300 chk engine and trac lock lite on

I had check engine light and TRAC OFF. OBD-II MIL code was P1133 which is Air Fuel Ratio Sensor Response Malfunction and scanned by AutoZone. After disconnecting the battery for 10-15 minutes, the lights went off. I cleaned the gas cap and tightened it firmly. For the last 400 miles, the lights have not come back. When scanning using Snap-on one, no code was detected. I think gas cap was the reason for the lights.