Question about 2001 Lexus RX 300

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P1155 code changed the 02 sensors two times and still get code P1155 , its getting to cost me big bucks , and still get the code ?

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  • Lexus Master
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Try clearing the codes to see if they come back. If you have fixed the problem, the code won't come back. Else, this may be a connection issue or faulty wiring. Check your O2 sensor plug for corrosion or breaks and repair as necessary.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

Posted on Oct 30, 2011

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  • Lexus Master
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Do you only have one o2 sensor? Many cars have two- one in front of catalyst, one behind. The front one is for fuel trim.
Also, that code is for the whole o2 circuit, right? Might need to keep checking. Does your car have a heated o2 sensor? Just another circuit to check, if so. good luck.
Looked at your post again. See where you said o2 sensors. Already changed both, huh? Wow. good luck. Might need a multimeter for resistance test of circuits.

Posted on Oct 29, 2011

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1 Answer

ENGINE CODE 2002 SIENNA P1155


P1155 Air/Fuel sensor Heater Circuit Bank1 sensor 1
DON'T just throw a new oxygen sensor at this. First check the electrical connector to see if you're getting power for the sensor heater. It may just be a blown fuse. If the power is good, THEN buy a new sensor. Stick with NGK or DENSO brands. The others won't work well.

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Is the p1135 sensor connector the same as the p1155 sensor connector?


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I have a code of p1155 bank 1 sensor 2. which sensor is that


CODE P1155 HEATED OXYGEN SENSOR RIGHT HAND FRONT HEATER CIRCUIT MALFUNCTION.

Feb 14, 2011 | 2003 Toyota RAV4

1 Answer

Code p1155


P1155 Air/Fuel Sensor Heater Circuit. (Bank 2 Sensor 1)

Actually P1155 is pointing to a fault with the internal heater for the A/F Sensor (aka Oxygen Sensor) for Bank 2 Sensor 1. The PCM uses this internal heater to get the sensor to normal operating temps within a matter of seconds on cold starts. Replacing this sensor should solve your problem. This sensor is located in the front exhaust manifold.

Hope helps (remember rated this).

Aug 07, 2010 | 2001 Toyota Highlander

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The check engine light produced codes p1150 and p1155 on a 2000 toyota avalon xls.


All cars sold in the US after 1995 use the same on board diagnotics called OBD-II. The codes are the same. Search OBM-II error codes and you'll get a listing.

P1150 Air/Fuel Sensor Circuit Range/Performance. (cylinder bank 1 Sensor 2)

P1150 may mean that one or more of the following has happened:
water or corrosion in the O2 sensor connector, loose terminals in the connector, wiring burnt on exhaust components, open or short in the wiring due to rubbing on engine components, holes in exhaust allowing unmetered oxygen into exhaust system, unmetered vacuum leak at the engine, bad O2 sensor or bad PCM.

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.

Nov 16, 2009 | 2000 Toyota Avalon

2 Answers

I have a toyota rav4 2003 management light came on checked code p1155 oxygen sensor bank1 sensor 2 changed it, cleared code light still,came on again ,changed the other three ,cleared the code again, ran...


The upper sensors are air fuel sensors and the lower ones are o2 sensors. you cant mix these up. Assuming you did everything right and still coding then either the new sensor b1s2 is bad or the wirng(power and ground need to be checked. A scan tool can be used to look at the performance of the sensors too. Sometimes the codes just point to the area of the problem and changing the part isn't the answer.

Nov 15, 2009 | 2002 Toyota Avalon

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