P0125

[Kimitech]

Hello,

At first I would like to say I´ve used a search button.

My car after gutting the precats started to show a P0125 fault.
So I plugged in my diagnostic and get these interesting figures about o2 sensors:
Bank1 Sens1 - no voltage at all, but the short term fuel trim is changing a little bit depending on throttle.
Bank2 Sens1 - this one change quite swiftly from 0,1 - 0.9 V depending on throttle.

Long term fuel was about 25% but don´t know whch bank.
Sens2 - seems to be stable or once a time change, probably as it should be.

So out of this readings I´m assuming the right sensor is faulty.
How they should actually behave if new?

Weird is, that the O2 sensors were before gutting functional - no codes at all.

Thanks

[Ardent]

Sadly not uncommon that by disturbing the sensors, removing for gutting is enough to damage them. Had the same thing.
They live in a very hostile environment hot cold hot cold.

Your description of Bank 2 sens 1 is exactly what you should expect. Bank 1 sens 1 should act in the same manner.
Sparkplugs.co.uk is good place to buy, but recently many have found amazon to be cheaper. From memory DOX0204 is your weapon of choice.

[Kimitech]

Nicely said, many thanks.
Will check if the wiring loom itself is working as it should by just swapping the sonsors.

[Bugster_MR2]

I support what Ardent said above. Same thing happened to mine. Did not work after I removed/reinstalled them.