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2001 TOYOTA AVALON CODE P1155 WHAT IS IT - 2006 Toyota Highlander

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This codes means the heater circuit of the engine cylinder bank 1 sensor 1 air fuel ratio sensor (AKA O2 sensor) is out of resistance self test range, in plain terms the electric heater grid in the sensor is defective, this sensor is located in the exhaust system just off the exhaust manifold or in the exhaust manifold before the catalytic converter, the sensor is located in the bank of cylinders of the V6 that is in the rear and this bank contains the number 1 cylinder. see diagram below. sensor is round and about roughly the shape and size of a jumbo magic marker.



2001 TOYOTA AVALON CODE P1155 - e4795a7.gif

Posted on Jul 30, 2010

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SOURCE: The check engine light produced codes p1150 and

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.

Posted on Nov 17, 2009

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SOURCE: check engine sign appeared on

Appears it is an Oxygen sensor error, they are located in the exhaust system, in the v6, that code indicates the second bank (but unsure which bank that is) Ideally you need to take the car in for service, or at least inspect the Oxygen sensors, the code indicates that teh heater element has failed.

Posted on May 06, 2011

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After having the error code p0135 on my 2001 toyota avalon, I replaced the front sensor and am still getting a check engine light with the same code. Any ideas?


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Check engine sign appeared on my 2001 avalon , code error p1155, please advise


Appears it is an Oxygen sensor error, they are located in the exhaust system, in the v6, that code indicates the second bank (but unsure which bank that is) Ideally you need to take the car in for service, or at least inspect the Oxygen sensors, the code indicates that teh heater element has failed.

May 06, 2011 | 2001 Toyota Avalon

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

1 Answer

1999 avalon , check engine light ON, code P1155 02S


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

#2 sensors are always oxygen sensor located behind the cat converters, the A/F ratio sensors are always in front of the cat in the exhaust manifold, the part number for the sensor B1/S2 is 89465-09290 from Toyota .

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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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