<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}-->2000 Toyota Camry LE Sedan L4-2164cc 2.2L DOHC (5S-FE)
California emission.

Scanner reads 3.299 V with upstream oxygen sensor disconnected or connected.
Switched upstream oxygen sensor same reading.
Voltage range should be between 0.1 to 0.9 V

Jumpered blue & white sensor wires, reading increased from 3.299 to 4.987 V.
Which should mean that the wiring is ok.

Purchased a Replacement ECU from Flagship One, Inc & installed it, same 3.299 V scanner reading.

Downstream oxygen sensor reads ok.

Now I am running out of ideas.

 

Is the check engine light on and if so any codes?

What emission standard was the car built to as in Federal or California. The California car may have had an A/F sensor for Bank 1 Sensor 1 and O2 for after the CAT. In which case the voltage reading seems OK.

 

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--><!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}-->Is the check engine light on and if so any codes?
Yes. P0420
<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> What emission standard was the car built to as in Federal or California?.
California emission standard. My Camry was built in Japan.
<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> In which case the voltage reading seems OK.

So it looks like I got hung up on a higher voltage range which is ok.
then the problem is somewhere else

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}-->After replacing the Vin# matched ECU with the updated software I drove 20 miles when the ECL came on again (P0420).

 

P0420 is a bad converter.

See private message.

 

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}-->I installed a new catalytic converter in Sept. 23. MagnaFlow 1997-2001 Toyota Camry California Grade Direct-Fit Catalytic Converter (CARB Compliant) P/N 457015 Sold by: UNCP
Since the catalytic converter replacement I have used my Camry only for test drives to avoid damaging it.

 

What is the physical location of the two exhaust emissions sensors you wrote about?

The engine should have two emissions converters. One is on the exhaust manifold and the other under the chassis. You replace the one under the chassis.

Unless the check engine light is blinking the car should be OK to drive.

 

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}-->Upstream oxygen sensor is located in front of the engine.
Downstream oxygen sensor is located after the catalytic converter.

I replaced both oxygen sensors.

There was no drivability issue when I test drove the car last time, except a steady ECL came on after 20 miles.
The problem is car will not pass inspection with the ECL on.

 

What was the brand and part numbers of the replacement sensors?

Did you replace the integral exhaust manifold/emission converter?

 

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}-->Upstream Oxygen Sensor is a 89467-33040 (P/N stamped on Oxygen Sensor) Brand: BAIXINDE, Manufacturer Part Number 234-9010

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Downstream Oxygen Sensor For CAMRY 97-06 Fits REPL960908 (P/N stamped on Oxygen Sensor) Brand: After Market, symbol stamped on Oxygen Sensor is a Triangle with a W inside.

<!--td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}--> Did you replace the integral exhaust manifold/emission converter?
I am not sure what you mean by integral exhaust manifold/emission converter?
Do you mean the catalytic converter?