Hello I have a 97 Es300 and the check engine light has turned on. I have replaced my O2 sensor and the light has come on.

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2000 Lexus Es300 Knock Sensor - Location & Repair ...

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2000 Lexus Es300 Knock Sensor Replacement - Location & Repair. ... Check engine light comes on and you ...

To review, the check engine light will stay on until the problem is fixed and the code or codes are erased. And if the O2 sensor is disconnected the light will stay on for sure.
Do you have the trouble codes stored in the computer ?
FYI - the cylinders should have over 100psi of compression.

Then you need to check the CIRCUITS - not just replace sensors

Something odd about what you posted. An engine that is running lean shouldn't be using a lot of fuel. Lean is when there isn't enough fuel going into the engine. Two other sensors that regulate fuel flow are the map sensor and throttle position sensor. Temp sensor generally would cause a rich condition but I'd test that too. Be sure to check for vacuum leaks at the manifold and lines as well as fittings... A vacuum leak will give the O2 sensor a lean reading...seeing that, the computer will try to compensate by adding fuel. Clearing codes can change the way it's running but as soon as the computer runs through it's internal diagnostics it will turn the light back on if there is a problem.

P0420 is catalyst below threshold. It is triggered via the rear o2 sensor (post cat), so you may want to check that sensor to make sure it's functioning properly.

o2 is a sensor. You could try replacing the correct one (up to 4 o2 sensors are possible any given vehicle). If check engine light is still on, have the codes cleared, have scan performed again to get the fault codes for possibly the specific o2 sensor. Hope this is helpful.

Those lights indicate an issue with ABS or traction control systems. In order to properly diagnose the problem the vehicle's codes will need to be read with a scanner.

Generally speaking there is no danger in driving the vehicle but be aware you may not have functioning traction control and/or ABS while those lights are present.

It sounds like your starter motor could be at fault.

Does it turn over slowly,or not at all with out the jum leads?

are you sure that it is still the O2 censor? are you assuming because the check engine light is still on? because you have to reset it after fixing something you just disconnect your battery completely for a bit like 15mins and then reconnect it and the light should go away.

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.