[Oxygen Sensor - Bank 1 Sensor 1]

Thanks for the reply fidgits - I actually have an update on this quest for the 02 sensor.

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I managed to find some another useful site on the web and the discussions held there led me to finding this O2 Sensor - Bank 1 Sensor 1 on my engine type = 1MZ-FE.

This other site is: http://about.com/

Search for "O2 toyota" or code "P0135" and a whole list of discussions come up.

I pieced together my answer there.

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Anyways - back to the actual location of the O2 Bank 1 Sensor 1 on my engine, it's physically located at the "back" of the engine when you lift open the hood. The "back of the engine" is the side closest to the firewall/passenger's compartment.

It's not easily assessible at all from the top - as you're looking into the engine area. I can only see it by standing on the driver side and peering into the lower back side (between the engine and firewall) of the engine.

It looks like the shape and size of a spark plug with a cable attached to the end of the unit. The cable leads to a connector - which needs to be detached in order to test the resistance. Inside the cable - there are 4 wires.

The only way I was able to reach this O2 sensor is to get "under" the car, lifted on ramps. And then - you need a rather small sized arm to sqeeze in - to reach and remove the sensor.

Also - since the sensor is attached to the exhaust-like pipe - it's normally extremely hot in this area. So - the sensor was almost fused tightly together in the socket. I had to use WD-40 and other "liquid-wrench" - rust penertrating type spray to loosen it. I struggled for more than an hour with an adjustable wrench before it finally came loose.

I measured the resistance of the O2 sensor and it read 2.5M ohms. The spec book said it should be between 11 - 16 ohms. So - it's definitely defective, which will need to be replaced.

It's not what I would recommend someone doing it themselves - because it was quite a struggle to physically get access to the O2 sensor unit. Unless - you're really determined to save (and I'm just guessing - $150 parts and $200 labour) - it's not worth the hassle. - I was only determined to do it because people said to leave it for the "pros".

Anyways - I hope someone else will find this experience useful.

mikeFromOttawa

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I thought the O2 sensor would be somewhere in your air intake system..

have you taken out the air filter and looked around there?

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[PO135 code]

I have a Solara 2000 V6 - and got have the code of P0135.

So - I need to replace the O2 Sensor - Bank 1 Sensor 1 - too. Would you know where it is located on my engine? - It's a 1MZ-FE engine.

I've posted this message on the Camry section too.

Thanks

mikeFromOttawa

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For anyone who might find this helpful.  This was my experience on the fix (Updated)

I have a '98 Avalon and got the same P0135 code when checked at Advance Auto Parts yesterday.  I purchased the Bosch "universal" O2 Sensor for $ 64 as opposed to the $147 "wired to OEM" special. I agree with Mike that the wiring connection isn't too tough so save some $ and buy the universal unit.  However, the rub I had was knowing which sensor is Bank 1, Sensor 1.  Going to my Haynes book shows O2 Sensor with Bank 1, Sensor 1 being the front sensor easily seen when you open the hood and look down on the exhaust manifold.  But here is the kicker, the Avalon has two sensors, Bank 2 sensor 1 is the other with the heater circuit jumper together.  Bank 2 sensor 1 is between the engine and firewall, you can see better on driver's side when looking for it.  Going to the electrical wiring diagrams in the back of Haynes shows that if either sensor heater circuit faults I believe you will get the infamous P0135 code "Bank 1 Sensor 1 heater circuit".  Love those electrical diagrams.  So disconnect the sensors at the connector and pull out your volt meter. Check the heater circuit on each sensor before you replace the wrong one.  Check the terminals where the 2 black wires connect, no polarity on the heater circuit, for resistance (ohms) should be 11 to 16 ohms when engine is cold.  For instance, I got 13.2 on the front one and the back showed OPEN.  Replaced the back one and then went back to Advance for a PCM reset to clear the "Check Engine" light.

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[Oxygen Sensor - Bank 1 Sensor 1]

Hi,

I have a Solara 2000 V6 (Engine = 1MZ-FE).

The Check Engine lamp came on. Using my OBDII Reader -I got a code of P0135.

Then I checked the shop manual - and P0135 means a possible faulty "Heated Oxygen Sensor - Bank 1, Sensor 1). So - I need to verify if the resistance for this sensor is between 11-16ohms.

My question is: where is the Oxygen Sensor for "Bank 1, Sensor 1" located?

The diagram in the shop manual is really not clear and I could not find it in the Haynes manual neither? It's supposed to be connected to "Cylinder 1" - which is on the passenger side - closest to the firewall. But I can't seem to find it on my engine! :(

Any comments or suggestions will be really appreciated. Thanks.

mikeFromOttawa

BTW: I can see from the diagram that the other oxygen sensor for Bank 2 - Sensor 1" is located in the front of the engine - near the exhaust manifold.