Lambda light just came on...

[daveforber]

Hi again,

Just after a quick sense check. Yesterday I drove to Basingstoke and back (around 160 miles), and just before I got home, the lambda warning light came on. A quick scour of the net produces quite a long list of things it could be:

1. faulty oxygen sensor(front or rear)
2. faulty mass air flow sensor
3. faulty turbo boost pressure sensor
4. faulty boost pressure regulator
5. faulty engine control module
6. faulty or blocked catylic converter
7. ripped or loose clips on intake or turbo rubber hose's.

Now, the car ran OK today. It doesn't seem like it's in limp home mode or anything - it boosted OK, wasn't rough running, cutting out, or anything like that. In fact, if the lambda light wasn't on I wouldn't think there was anything wrong.

Looking at that list, I suspect the catalytic converter, on the grounds that the others look like they would cause running problems. The car is a V40 2.0T with 113k on the clock.

Before I spend £90 on a new cat, does my logic hold up?

[daveforber]

Well, I disconnected the battery overnight as had been suggested on an 850 forum here et voila, no more light.

Do I assume everything is OK so long as it stays off?

[CONDYBOY]

yes mate, but for piece of mind get any stored codes read.