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Torque » Torque OBD ECU Scanner » Torque Discussion / Ideas » understanding O2 sensors - Subaru

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Author Topic: understanding O2 sensors - Subaru
IGY
Member
Posts: 2
Post understanding O2 sensors - Subaru
on: March 23, 2019 (GMT)

Hi everyone, apologies if this has been asked 1000 times. I have a copy of Torque Lite and have it talking to my bt OBDII adapter.

Question how do I work out which O2 sensor is which. Eg which is precat, post cat and MAF. Reason is I keep getting P0420 code and trying to work out the problem

I have a 2007 Subaru Liberty sedan with EJ253 engine.

Any assistance would be much appreciated.
cheers
Ian

cooldriver
Member
Posts: 27
Post Re: understanding O2 sensors - Subaru
on: March 23, 2019 (GMT)

It depends. 2 rows with 2 cylinders each?
Anyway, monitor probe is sensor 2.
Its voltage jumps with P0420.

IGY
Member
Posts: 2
Post Re: understanding O2 sensors - Subaru
on: March 25, 2019 (GMT)

Thanks cooldriver

The only O2 sensor graphs that I can get anything from are:

O2S1Eq – this shows minor fluctuation of the voltage, and

O2 1×2 – this one shows quite a bit of voltage variation and never settles or plateaus .

I assume the “O2 1×2 is the post cat, although not sure what the other is. Also I was assuming that the pre-cat sensor would have been O2 1×1”, although that shows no voltage.

Capp777
Member
Posts: 2859
Post Re: understanding O2 sensors - Subaru
on: March 25, 2019 (GMT)

Maybe this thread applies to
your vehicle too?

https://torque-bhp.com/forums/?wpforumaction=viewtopic&t=11176.0

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