Codes P0135 and P0155

Tiny
SZALKUSKT
  • MEMBER
  • 2002 TOYOTA AVALON
  • 3.0L
  • V6
  • 103,000 MILES
I have codes P0135 and P0155 displayed on code reader. Both are 02 heater circuit malfunctions. P0135 is Bank 1 Sensor 1 and P0155 is Bank 2 sensor 1. What is your recommendation on what to do? I am thinking I will need to change two 02 sensors? If so can you help me pinpoint and locate them? I believe there are four total. I need to understand which sensors I need to replace if that is the fix.
Saturday, June 17th, 2017 AT 4:29 PM

4 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Bank 1 is the exhaust bank with No 1 cylinder bank 2 the other side sensor 1 is the up stream sensor that is the top sensor. i would fist check with a live data reader that the sensors are faulty first.

Here is a guide that will show what you are in for when doing the job

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Please let us know what happens.
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Sunday, June 18th, 2017 AT 5:49 AM
Tiny
SZALKUSKT
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Well, I want to ask you about the two sensors, They are both giving a "heater circuit malfunction", (P0135 and P0155), so Is there something I can do to check like a fuse or anything simply because I have two codes related to the heater malfunction? I also went to the Toyota dealer to price sensors and also get the correct factory part numbers if I want to purchase them online. According to the Dealer Bank 1 Sensor 1 is the "right" side (rear exhaust manifold by the firewall) and the Bank 2 Sensor 1 is the "left" side (forward exhaust manifold near radiator). Does this make sense? I do not have a firing order diagram or cylinder number layout diagram that is why I am asking. I am sure that I will not be able to check with a live data reader although I believe my OBD2 scanner will check the 02 system and the 02 sensor icon will stop blinking after the 02 system is working. Is this what you are asking? What would cause both heater circuits to cause the codes?
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Sunday, June 18th, 2017 AT 12:13 PM
Tiny
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  • 274 POSTS
I also believe that they are called air fuel ratio sensors. Right side part number 89467-41030 and left side part # 89467-41040 at Toyota dealership $276.20 each.
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Sunday, June 18th, 2017 AT 12:15 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,088 POSTS
Hello,

Yes, heater codes are common. Replace the sensors with new and the problem should be fixed.

Please let us know what happens.

Cheers, Ken
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Wednesday, June 21st, 2017 AT 11:29 AM

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