Missing o2 sensor

[hasankhurshid29]

I think it depends
First get your check light connected and get the error codes scanned using obd 2 scanner. And post the codes list here. If its showing a code for secondary o2 sensor then this means you have an ecu of later gen 1nz engines in which catalytic converter are also present and they have secondary o2 to monitor the performance of the catalytic converter.
Usually mechanics here swap old gen 1nz and ecu is also old one so it doesn't need catalytic converter and Second O2 sensor.

Also I think you maybe having multiple codes so better to get the check light connected and get the car scanned.

[hasankhurshid29]

Mine doesn't have 2 O2 sensor, only 1 and No catalytic converter and no error codes present if I scan using obd 2 scanner

[hasankhurshid29]

There are two cat converters

Why there will be 2 catalytic converter present? There can be only one catalytic converter present with 2 O2 sensors. And if no catalytic converter, then only 1 O2

[UAHMAD]

This is the second O2 after the first cat converter.

[hasankhurshid29]

You will only be having one cat and two O2 sensors.
Mine doesn't have cat that's why only one O2 sensor present.
Btw which car you have swapped this engine and what mileage its giving you? Is it V1NZ or R1NZ?

[Hassan1991]

agreed with @hasankhurshid29
there are like 4 different variant of 1nzfe. late have 2 o2 sensor.
here in scrap mostly are early gens.

[Xulfiqar]

I can bet that the dlc is missing too if the engine check light isnt connected.

[atifbetani136]

its a 9th gen corolla the engine came from vitz as i have been told, mileage is 195000(not reducing oil) the electrician said it's from vitz with manual ecu. It can't be the later version as the one that came with axio is quite expensive and difficult to wire according to my friend

[atifbetani136]

The port is present .Sir what should I do to I mean the mistre here will say anything to fool a customer and rip them off because a week earlier I was having the same problem and the mechanic said spark plug change kar lo teek ho gayay ga masla and then he said throttle body change kar lo fuel consumption kam ho gayay ge I have done everything and spent about 12k in just a month bit all in vain
I also purchased a Bluetooth elm but the it won't connect to the ecu.

[atifbetani136]

You are right sir. But I also borrowed a Bluetooth scanner from my friend It did connect to the port but wont connect to the ecu in torque application and an other apk I don't remember the name of.

[atifbetani136]

Is there a way to check the variant of engine without the scanner so that i can Google for its data sheet. Thanks

[hasankhurshid29]

You are right sir. But I also borrowed a Bluetooth scanner from my friend It did connect to the port but wont connect to the ecu in torque application and an other apk I don't remember the name of.

You need to add these strings in the vehicle profile to connect to the ecu: ATIB96\nATIIA13\nATSH8113F1\nATSP4\nATSW00
I am currently using it with my 1nz

[hasankhurshid29]

Is there a way to check the variant of engine without the scanner so that i can Google for its data sheet. Thanks

Variant of engine doesn't matter that much. The wiring and sensors mostly depends on ecu. Please post picture of ecu sticker

[UAHMAD]

I think it's the late version of this engine because it has two cat converters and two O2 sensors. This is as far as I know.

In your case, having one O2 sensor (and not having a cat converter) makes sense because the first sensor functions to measure air/fuel ratio of exhaust for maintaining an optimum mixture (not too lean or rich). And the second O2 sensor functions to monitor the cat converter's efficiency (which your vehicle doesn't have).

[atifbetani136]

Just installed a kabuli o2 sensor in the car as new one was not available the welder took out a nut from a scrap cat converter and welded it to the header he also pointed out that the cat is missing as well and said that you have to install a new cat or else the sensor will not work .but the electrician assured that it will. Now lets see the results I will be posting updates soon.
Thank you all for your prompt responses and helpful tips.

[Hassan1991]

You should change the headers as well. Each engine has different flow and headers are designed for that from factory.

[atifbetani136]

Tried it but it won't connect to the ecu.

[atifbetani136]

[Hassan1991]

Thats an early gen ecu.

[atifbetani136]

So which variant is it ?