O2 Sensor no activity bank 1

[Conor]

So totally typical of life... I've been here in Ireland a month and the day before I have the 350 mile drive back to London I get the above error on the R230.

Code is P0154.

Just wondering if this is something that is critical or if I can drive on it.

I read somewhere that I can use my scanner to check the voltage and if it stays a constant value then its fried. Any ideas?

 

[LostKiwi]

Yes look at live data for the sensor.
It should change.
You can drive with no problems.
At least it's an easy fix (if it comes out without too much argument).

 

[Conor]

Thanks LK.

Looks like the sensor is goosed. Is it a difficult place to get to?

Also can somebody clarify the difference between O2/Lambda/NOx sensors?

It feels like they are often interchanged? Are O2/Lambda the same and NOx is just NOx?

Note to self: The sensor is number 270 on the diagram and is part number: A0015405017

 

[LostKiwi]

An O2 sensor and a lambda sensor are the same thing but not the same as a NOx sensor.
You have 4 sensors in total. One each side in front of the cat and one each side after the cat.
The front ones monitor the emissions and tailor the fuel mixture. The two rear ones monitor the condition of the cats.

The front ones will change in value as the ECU trims the injection richer and leaner. The rear ones stay largely constant if the cats are healthy.

 

[Conor]

An O2 sensor and a lambda sensor are the same thing but not the same as a NOx sensor.
You have 4 sensors in total. One each side in front of the cat and one each side after the cat.
The front ones monitor the emissions and tailor the fuel mixture. The two rear ones monitor the condition of the cats.

The front ones will change in value as the ECU trims the injection richer and leaner. The rear ones stay largely constant if the cats are healthy.

Great thanks for confirming.. Was largely as I had imagined.

Do you know how easy/difficult the upstream ones are to access on my r230? Eaiser from below?

 

[LostKiwi]

Not had to do one sorry but they're usually awkward to get to. Use a ring spanner to undo - disconnect the cable and slip the ring spanner down the wire. Needless to say douse in a good penetrating oil first!