RX - 1st Gen (1999-2003) Discussion topics related to the 1999 -2003 RX300 models

Check engine light??

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Old 11-01-02, 08:05 PM
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Gene
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Question Check engine light??

A couple of weeks ago "check engine" light lit up on my 99 RX300 took it to mechanic to get tested the diagnostic device showed that is was aproblem with oxygen sensor, I replaced it (not a cheap part too), they reseted computer the light disappeared but just for a while now it's back on. Went back to the shop and now it shows this:

P0125 Low ECTfor Closed Loop fuel ctrl
P1135 Description not found

Any help with this Trouble Codes would be appretiated.

Old 11-05-02, 01:26 PM
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Handogen
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I'm wondering if there's a problem with your fuel lines or injectors.... I've been on this board for several months and this is the first I've heard of this problem. If you get an answer from your Lexus service department, please share with us!

Hando
Old 11-16-02, 09:39 PM
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EvenCylinder
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Whitch O2 sensor was replaced? I believe there are 3 to choose from. The most common O2 to fail is in the rear exhaust manifold. At least this is the one ive replaced severall of.
Old 11-17-02, 07:22 PM
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Sooner
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dont you mean the front one above the oil filter with the connector by the trans dipstick tube?
Old 11-18-02, 10:14 PM
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Gene
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Ok. Guys!
Stop guessing.
Here is the deal. RX 300 has 3(three) Oxygen sensors. Air/fuel sensor (screw in type dealers price ~ $300) that goes to the exaust manifold (this manifold is look like a baseball glove) and this one is on a front of the engine, another one is down at the exaust pipe right before the catalytic convertor (flange connection ~ $ 100) and it's a pain in the neck to get it out because of the high temperature at this spot the nuts that are holding the flange are fried to it, next and the last one is somewhere is on th so called "right bank" and this one is about $450 to get this one out you have to leave your car overnight because they won't work on it utill the engine is stone cold.
Good luck evyrone have fun.
Any suggestions on the extended warranty?
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