1999 Lexus ES 300 Fuel Air Sensor

1999 LEXUS ES 300
275,000 MILES • 6 CYL • FWD • AUTOMATIC
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HANKDCN
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This car gave a code of P1133 sensor 1 bank 1.
The Mechanic says this is the o2 sensor-located at the
front exhaust manifold.

However, othrs have described P1133 as the fuel air
sensor located neatr the catalytic converter.
I would like to have the correct one replaces, since there is a difference (as I understand) between the fuel air and o2 sensor.

Please help what is the correct answer?
Oct 27, 2009 at 4:31 PM
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GRIFFINAHN
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I have a same 99 Lexus ES300 and had the same scanned code of P1133. P1133 means Air/Fuel Ratio Response Malfunction (Bank1 Sensor1). I have checked with a Lexus dealer and found that Bank1 Sensor1 and Bank1 Sensor2 are both Air/Fuel Ratio Sensors at the front of the engine near manifold. Bank2 Sensor1 (Oxygen sensor) is located at the back side of the engine. I hope this would help you.
Dec 26, 2009 at 4:06 PM