How do I resolve error code P1135 in my Toyota Camry?

Question

I recently replaced the downstream O2 sensor in my Toyota Camry. Shortly thereafter, the check engine like came on again providing the following codes:

P1135 which I understand to be the upstream sensor.
P1155 is a little bit tougher for me to find any information on, but it appears to be the "Coolant Temperature Sensor Circuit for Coolant Heat Storage System".

When it comes to making these types of repairs, I'm a novice but am interested in resolving these issues on my own if possible.

My two questions are:

Does anyone know if P1135 and P1155 are related?
If so, will replacing the O2 sensor resolve both codes?

Tim · Answer

Both codes look to be related.

P1135 Air/Fuel Sensor Heater Circuit Response (Bank 1 Sensor 1)
P1155 Air/Fuel Sensor Heater Circuit. (Bank 1 Sensor 2)

Source: http://www.engine-light-help.com
Replacing the sensor may fix the issue, but as pointed out in the answer to your previous question:

it is not always the sensor that goes bad. Sensors read the mixture and efficiency of your combustion, and can trigger a code if you are running rich/lean.

Source: https://mechanics.stackexchange.com/a/2880/1554
Some additional information:
http://www.justanswer.com/toyota/
http://wiki.answers.com

Anthony Tsogbe · Answer

P1135 Air/Fuel Sensor Heater Circuit Response (Bank 1 Sensor 1) is correct. I had the same code since 2010 until 2013. The day I changed O₂ sensor 1 upstream for my 2001 Toyota Camry (4 cylinder, 2.2L) the code was cleaned, and then the engine light went away.

Answered by Anthony Tsogbe on June 15, 2021

Giuseppe Urso · Answer

I have a 1st Generation (1995-1999) Toyota Avalon with a P1135 error also. I change the Denso Air Fuel Sensor P/N: 234-9007 and it solve the problem and the check engine light went away. I change it from the top instead of going under the car it was really easy. Hope this help like other have help me. Sensor Diagram

Answered by Giuseppe Urso on June 15, 2021

Roc · Answer

I too have a 2001 Toyota Camry. I also had issue with oxygen sensor. Replaced both upstream and downstream sensors. Still pulled code p1135. Was told to try replacing plugs, PCV valve, and to check for leaks between the O2 sensors on the exhaust pipe. Come to find out was give. The wrong sensor. The upstream sensor required one for California emissions. Finally got the right one and bang! No codes. Problem solved. Plus got new plugs and PCV valve. lol.

Answered by Roc on June 15, 2021

How do I resolve error code P1135 in my Toyota Camry?

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