P1135 A/F O2 sensor questions

[ssolomo]

Hi,

Not on here much since the wifey's '01 I4 Camry doesn't break enough to necessitate searching the forums often...

CEL came on, pulled a P1135 code. The OBDII says a/f sensor and I see that all over the forums - seems like an O2 sensor to me (and I actually just replaced an O2 sensor in my Ford). See the screenshots below. Other problem seems to be battery, but it is less than a year old and has good voltage.

Two questions:
1. What's the difference between an O2 and an A/F sensor?

2. Typically with an O2 sensor you have to go through a series of cycles before you trip the code - however, after pulling the code I reset the computer and about 10 seconds later it came back - exactly the same codes and data. That leads me to believe that it isn't the O2 sensor. Or, am I misreading the diagnosis?





Thanks in advance for any help!

[ssolomo]

Well, if there are no replies, can I get this bumped to General Camry forum?

Also, would someone please be kind enough to suggest what the actual part name / number is for the A/F sensor? I can only find O2 sensors on toyotapartsales.com but that appears to be downstream sensor.

Thanks.

[ShawnM]

What your seeing is the code for a heater circuit fault. A bad or slow responding sensor will take up to a couple drive cycles to set a code. The heater circut however is triggered right when you first start the car so the code would pop up fairly quick. 90% of the time its the heating element inside the O2 sensor that is causing the problem.
The part number I show for it is:
89467-33020, Air Fuel Ratio Sensor

[Eye8Pussies]

^ what he said

BUT as for part numbers, the sure way to get the right number for your specific car is to go to your dealership with your VIN, then get the part number

after that, you can get the part from whereever you can find it

[Kep]

I don't know when they started calling them A/F sensors but the O2 sensors are now labeled A/F sensors...go figure. Remember, the code does not say you have a bad sensor. It says that the sensor system is not operating within specs. Check the wires and connections to make sure that you don't have a wiring problem. It could be the sensor or it could be something else causing the sensor failure.

I expect that ShawnM's code translation is accurate about the heater not operating. I don't believe that is repairable if it is a fault in the sensor itself.

Kep

[ShawnM]

To quickly go over your other question. There is a difference between an Air/Fuel ratio sensor and a regular Oxygen sensor. The air/fuel ratio sensor (also known as a wide band sensor) is more prescise in its measurements. The two can not be interchanged. The upstream sensor in your car is the A/F sensor and the downstream is a standard Oxygen sensor.

[toyomoho]

Suggest using Toyota OEM or the Denso brand to assure the CEL will stay off once repaired.

[ssolomo]

OK - thanks for everyone's help. I'll call tomorrow for prices on a new A/F sensor. The wiring looks OK under the hood so it must be the sensor itself. Looks like I can take an 18 or 19mm wrench to get it out - piece of cake. Gotta love all the room in the engine bay with the 4 cylinder!

Steven