|Lambda always lights up
Recently, my Volvo 850GLT's lambda always
comes on. I'm told it's a knock sensor faulty
problem but it's still OK to drive on. Will this
affect the fuel consumption and performance
of the car? Is there an alternative to a costly
Answer : If the lambda light is coming on, it is not the knock
sensor as they are two different components. The lambda sensor is fitted in the exhaust
system to monitor the exhaust gases and is sometimes also called an oxygen sensor.
Its purpose is to get the air-fuel mixture as close
to the stoichiometric ratio (16:1) and if it fails, you
will have heavy fuel consumption. The knock sensor varies the ignition timing and retards the timing if. there is "knocking" in the engine which
could be caused by over-advanced ignition timing.
If either of these components fails, you will have
loss of performance and you cannot continue driving around with failed components as ultimately
there will be damage to the engine.