Got the P0135 code yesterday... Bank 1 Sensor 1 Heater Circuit Malfunction.
Engine light went off but code is still being received by OBD Reader
From what I've read this is a problem with the Oxygen Sensor.
I believe from what I've read this is a problem with the O2 sensor closest to the firewall. Is this correct?
Are there just 2 O2 Sensors on the entire car? or is there a third after the catalytic converter?
Looking on RockAuto, I see "downstream" and "upstream" sensors. I'm not sure which I need.
Any advice/insight is much appreciated. Thank you.
Got the P0135 code yesterday... Bank 1 Sensor 1 Heater Circuit Malfunction.
Engine light went off but code is still being received by OBD Reader
From what I've read this is a problem with the Oxygen Sensor.
I believe from what I've read this is a problem with the O2 sensor closest to the firewall. Is this correct?
Yes. And the vast majority of the time, the problem is with the sensor. The error code is saying the heater circuit is open or the resistance is too high. Usually this is because the heater in the sensor is burnt out. But it's possible there's a fault in the wiring. Not likely, but possible.
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Are there just 2 O2 Sensors on the entire car? or is there a third after the catalytic converter?
There are two or three. It depends if it has CA emissions or not. CA would have three. Look under the hood for a sticker saying what the emission system is compliant with
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Looking on RockAuto, I see "downstream" and "upstream" sensors. I'm not sure which I need.
You need upstream. If your car is CA emissions equipped, it might require an air/fuel ratio sensor instead of an O2 sensor. You can look it up the correct p/n's for your Avy here on Denso's website. I highly recommend you get Denso sensors, by the way. They're the OEM supplier to Toyota. Once you know the correct Denso p/n, you can get them at Rockauto.com or Amazon. Both have decent prices on them.
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1992 Camry LE, V6 (3VZ-FE), ABS brakes, 330k miles, dark emerald pearl, owned since new.
1996 Avalon XLS, ABS brakes, moonroof, white, acquired w/ 139k miles, now at 261k.
2001 Yamaha FZ1, Ivan's jet kit, resprung all around, Ohlins in the rear, Race Tech cartridge emulators in the forks, 45k miles.
Hope this info helps, its out of the Chitons Manual.
4 cyl Engine has 2 O2 sensor upstream is attached to the front of the exhaust manifold. The down stream sensor is after the cat conv and the wiring plug is under the passenger seat which they state is easier to remove seat to disconnect.
V6 engines have 3 sensors; Front exhaust manifold (manual labels it bank 1 sensor one) and the 2nd sensor is on the back manifold and is not labeled as to which one it is (both of these are upstream) and then the downstream is after the cat. This sensor they say to remove drivers seat and carpet to replace. It is important to use anti sieze compound on new sensor threads when replacing so they can be removed if necessary in the future.
There is a procedure to verify whats happening to the sensor but I don't have a way to send a picture of the connector which you would have to back probe and measure with a volt meter. Hope this helps! I am still hoping someone has seen the problem I have with my 99 not starting. I am making progress as to what my problem isn't but I am still not 100 % sure. Good Luck with yours!
BMR, do you recommend Denso over Bosch, if so, why?
Bosch sensors often don't work well in Toyotas. You wouldn't think compatibility would be a problem. But I've seen quite a few posts on the Camry part of the board where Bosch sensors didn't work well.
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Can the air/fuel sensors be used in replacement of the O2 sensors (with any added benefit), and/or is this not recommended? Thanks again.
I wouldn't try it. The ECM isn't programmed to work with them.
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1992 Camry LE, V6 (3VZ-FE), ABS brakes, 330k miles, dark emerald pearl, owned since new.
1996 Avalon XLS, ABS brakes, moonroof, white, acquired w/ 139k miles, now at 261k.
2001 Yamaha FZ1, Ivan's jet kit, resprung all around, Ohlins in the rear, Race Tech cartridge emulators in the forks, 45k miles.
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