Toyota 1mz-fe Engine Diagram

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Yi Pressimone

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Aug 4, 2024, 3:44:08 PM8/4/24

to redsearera

Thediagram 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! :(

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.

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.

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".

Mike, as a X-mechanic, let me thank you for posting the information that you did. There's going to be 1000 other people looking for that information. By the way, Liquid Wrench works wonders with O2 sensors that are frozen. I know, it recently happened to me with my girlfriend's Sentra. Liquid Wrench was just the trick!

I have made a group of diagrams for the engine drive belt for the models that were searched the most on this website. I have bundled them together on this page for your convenience. These are for various engine models, but mainly for Toyota.