New code.....any ideas please.

**V70 Graham** · Thursday 26th December 2013, 20:35

Had a new code come up today, PO134

I think this equates to : 02 Sensor Circuit No Activity Detected (Bank I Sensor 1)

As most of you know I've had the exhaust replaced (a couple of times) recently, am I right in thinking it could either be wiring or a faulty O2 sensor ?
Could it be the rear sensor even though it's coming up as Bank 1 Sensor 1 ?

Taking into account the above any recommendations where to start ?

**jdavis** · Thursday 26th December 2013, 20:37

you and that blooming exhaust lol

says to me dodgy sensor. Can't remember but did you have a de-cat/race cat fitted?

**stribo** · Thursday 26th December 2013, 20:38

It's likely to be the front one, and what with all the ins and outs it's had recently, it'll either be the harness going up to the connector, or the sensor itself.

**V70 Graham** · Thursday 26th December 2013, 20:42

Thanks guys, I have a spare rear one lol.....M-R-P reckoned the wiring too, suppose I'll start with that then.....

**V70 Graham** · Thursday 26th December 2013, 20:43

Originally Posted by jdavis

you and that blooming exhaust lol

says to me dodgy sensor. Can't remember but did you have a de-cat/race cat fitted?

Had a 200 cel cat fitted, back to stock now though.

Seems to be using a bit more fuel too, drove up to Cambridge today like a girl and only got 30mpg

**stribo** · Thursday 26th December 2013, 20:47

If it's not getting a signal from the lambda (for whatever reason) it'll overfuel and ruin your fuel economy. The front and rear sensors should be the same, other than the length of the wires on them, so the rear one should fit on the front.

**V70 Graham** · Thursday 26th December 2013, 20:50

Originally Posted by stribo

The front and rear sensors should be the same, other than the length of the wires on them, so the rear one should fit on the front.

Really, I know there are literally loads of sensors for these cars, mind if I only have the shorter wire I'm stuffed anyway.

**stribo** · Thursday 26th December 2013, 20:59

THe front one has the shorter wire, the rear one the longer, so the rear will fit the front, but I don't think the wire's long enough for the front to fit the rear. I have a front one in my dp you can try if ther rear one is different.

**V70 Graham** · Friday 3rd January 2014, 17:08

Car still off the road, was in the garage today where a faulty front lambda was diagnosed.....part ordered and changed but code came straight back.

Now they say it's the rear, which I had although it was the wrong one (thanks PFV) part is on order for the middle of next week.

Getting a bit fed up of Volvo at the moment.

**Dangerous Dave** · Friday 3rd January 2014, 17:25

Hang in there Graham

**deathrider311271** · Friday 3rd January 2014, 17:29

Graham a bit of free advice mate, the front sensor is the one closest to the engine, DO NOT SWAP IT WITH THE BACK ONE, it will screw your fueling up something cronic, mine was wrong when i bought it, sensors had been put in wrong place and i was getting 12mpg average. You cant swap them round as the plugs are different and please use bosche items not NGK/NTK they only lasted approx 12 hours in my car before fault returned.

**graemewelch** · Friday 3rd January 2014, 17:29

have you checked the fuse.

**stribo** · Friday 3rd January 2014, 17:32

Did they check the wring/plug that the lambda plugs into, as P0134 is the front sensor, not the rear.

**V70 Graham** · Friday 3rd January 2014, 18:25

Originally Posted by graemewelch

have you checked the fuse.

I'm guessing it's an in-line one, I'll check they have looked at this.

**V70 Graham** · Friday 3rd January 2014, 18:27

Originally Posted by stribo

Did they check the wring/plug that the lambda plugs into, as P0134 is the front sensor, not the rear.

They said they did, Anne dropped it off this morning, I'll get her to check tomorrow when she picks it up.

Is there any way the two lambda's are linked/connected so it could be a fault with the rear one ?

**deathrider311271** · Friday 3rd January 2014, 18:44

Originally Posted by V70 Graham

They said they did, Anne dropped it off this morning, I'll get her to check tomorrow when she picks it up.

Is there any way the two lambda's are linked/connected so it could be a fault with the rear one ?

the only link is in the ECU mate

**stribo** · Friday 3rd January 2014, 18:47

Who's doing the car for you?

**V70 Graham** · Friday 3rd January 2014, 19:11

Originally Posted by stribo

Who's doing the car for you?

PWCars at Beaconsfield

**V70 Graham** · Friday 3rd January 2014, 19:12

Originally Posted by deathrider311271

the only link is in the ECU mate

So it can't be the rear sensor.....strange why they think it is.

**deathrider311271** · Friday 3rd January 2014, 19:14

Originally Posted by V70 Graham

So it can't be the rear sensor.....strange why they think it is.

it did baffle me a bit as too why they changed the rear sensor when they knew it was the front one, especially when the code returned straight away. Are they using Vida Dice for diagnostics or something else?