andythejock01wrx

My CEL light came on and stayed on last week. I was razzing it up a dual carriageway.

I've been told it could be the lamda, or the neutral position switch.

Re the lambda, what does it do and how much is the Subaru unit ?

Is it true that a faulty one could affect mpg ?

The rookie

iTrader: (1)

Sort of, actual standard cars don't have a Lambda sensor at all, they have an oxygen sensor from which Lambda can be inferred (it cannot measure lambda at all, only exhaust gas Oxygen).

The Oxygen sensor outputs a voltage dependant on the amount of Oxygen in the exhaust and from this the engine managment controls the fuelling around Lambda one. I don't know how much it costs from Subaru, but correct fit items from the specialist websites are typically £80-100.

Yes, they typically fail reading lean, so the engine managment adds fuel to its limit to compensate, this does nothing for the already poor fuel economy!

Simon

andythejock01wrx

Cheers Rookie. Appeciated.

AndytJ