Beru 02 Sensors

[sdg1970]

I changed my pre-cat O2 sensor for a Beru and it's thrown a P0131 code. Old sensor was ntk and I changed it as a matter of course, Unfortunately can't put the old sensor back in as I broke a wire. Are Beru kak?? 🤔

[byootox]

No, Beru are a decent enough make and used as OE equipment with several manufacturers although I mainly see them on the French cars not on the Volvos.
Have you checked what the readings are on the sensor ?
This a low voltage code on the circuit.
The reading you get will depend on what year it is, a wide band 5 wire AFR sensor late 98-2000 or the normal 4 wire up to 98.
Check your wiring is in good condition going to it.
The later wide band sensor should show a fairly constant reading of AFR(1) with the occasional fluctuation to 0.99 & 1.01
The earlier standard sensor should flip flop between 0.2-0.8v at about 1hz roughly.

[sdg1970]

Originally Posted by byootox

No, Beru are a decent enough make and used as OE equipment with several manufacturers although I mainly see them on the French cars not on the Volvos.
Have you checked what the readings are on the sensor ?
This a low voltage code on the circuit.
The reading you get will depend on what year it is, a wide band 5 wire AFR sensor late 98-2000 or the normal 4 wire up to 98.
Check your wiring is in good condition going to it.
The later wide band sensor should show a fairly constant reading of AFR(1) with the occasional fluctuation to 0.99 & 1.01
The earlier standard sensor should flip flop between 0.2-0.8v at about 1hz roughly.

Interesting thread: http://www.bba-reman.com/forums/Topi...px?PageIndex=2

mine is a 97 car with the 4 wire sensor. I'm taking it back tomorrow and exchanging for a - more expensive - Bosch. Will report back when fitted...

[CNGBiFuel]

You're more tolerant than me, byootox.

OP does not say what he drives, ie: he asks for information but CBA to give any.

Makes you wonder. I'm not sure how anyone can answer accurately. The Denso system has different requirements again.

£50 says, after a game of 20 questions, with the final solution, he won't add to the knowledge base by posting a conclusion either.

[sdg1970]

Originally Posted by CNGBiFuel

You're more tolerant than me, byootox.

OP does not say what he drives, ie: he asks for information but CBA to give any.

Makes you wonder. I'm not sure how anyone can answer accurately. The Denso system has different requirements again.

£50 says, after a game of 20 questions, with the final solution, he won't add to the knowledge base by posting a conclusion either.

Calm down dear - 2k and 40 Rothmans says I will! Car is a 97 V70R Motronic 4.4 and I have just picked up the Bosch sensor and hope to install this weekend, time and responsibilities permitting. It's actually now in the local garage having two front wheel bearings though and whilst I can fit o2 Sensors, I don't have the equipment for bearing replacement unfortunately.

Is this ok with you, or should I execrate myself now for Fear of not being fit for purpose....🙄

[sdg1970]

Ok, so some degree of progress and perhaps a result!!

I fitted the Bosch sensor after getting the car back from the garage after it's new wheel bearings (££££). Just took it for a 40 mile drive and bingo no P0131 code or 0172.

Tentative and provisional conclusion thus: Beru oxygen Sensors have a different impedance than Bosch ones and are therefore not fit for purpose in a Bosch system. I have gained 4+mpg already. It's been a good day...

[byootox]

Good result on that one then !! Bosch or NTK is normally the best sensors on these Volvos.
Not sure how much tools you have but the front wheel bearing are bolt on, on these cars, do-able job yourself normally.
Although if if your in doubt or time constraints you probably done the right thing.
Another little tool that's worth investing in if your doing a few o2 sensors on various cars is the thread chaser for the exhaust bung side of it, that way if you damage the threads during removal of the old one you can cut a new thread into your existing exhaust.