Question about 2000 Lexus RX 300

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2000 Lexus lx300 getting obd 2 codes P1150,P1155 need help

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P1150 Air/Fuel sensor circuit (bank 2 sensor 1)
P1155 Air/Fuel sensor heater malfunction (bank 2 sensor1)
There are a few quite a few reasons why this problem is present.
The car is 10years old, probably has between 100k and 200k miles.
I would guess that the sensor is bad and needs to be replaced. But you do want to look at other aspects of the car. I'm not there so you will need to find and confirm if the car needs a tune-up, if there is water in the fuel, if there is something else wrong with the exhaust system (like the CAT).
Also the wiring would need to be inspected to see if there are corroded, bent, or missing pins.
I will tell you that without a good scan-tool, you will either luck-out with changing the A/F sensors or you will be playing the guessing game for days. Good luck, but let me know if you have more questions.

Posted on May 12, 2010

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Lexus es300 got auto code p1150. What does this error mean?


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Air sensor check engine light


Ok as a guess that you have a SUV and you have different air faults. if you are a DYI'er go to an auto parts store and get an error code tool. Harbor freight for $30-50. Hook it to the car and find out which sensor is it calling for. Note, you can reset the check engine light on most tools that are not the cheapest.
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My car came up with a P1150 code for my lexus rx 300. what does that mean?


Tests/Procedures: 1. With the sensor disconnected and the key on, check the voltage at the wire harness side of the connector. The Black wire should have 12 volts the Orange wire and the White wire should be approximately 3 volts.

2. Reconnect the sensor connector and check the voltage on the Black wire on start up. It should remain battery voltage. The Orange wire and the White wire should vary slightly in voltage from 3-3.3 volts but the sensors will not change much.

3. Install a new sensor. Potential Causes: Defective Air Fuel (A/F) Ratio Sensor
Tech Tips: This is a common issue with the air fuel ratio sensors. The firewall side will fail and the technician will install a new sensor and then a few days later a code for the other sensor will appear. Always replace these sensors as a pair.

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1 Answer

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Here can find several articles about OBD codes

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P1150 may mean that one or more of the following has happened:
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P1155 Air/Fuel Sensor Heater Circuit. (cylinder bank 1 Sensor 2)
P1155 may mean that one or more of the following has happened: O2 Heater element resistance is high, Internal short or open in the heater element or O2 heater circuit wiring high resistance

Solution :Replace oxygen sensor and see if the problem goes away.

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