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Lambda always lights up

Question : 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 repair/part replacement?

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.

 
   
 

Irritating sensor

Where is the sensor ?

ABsolute coincidental

Erratic rpm

Oxygen sensor

Lambda always lights up

Drop sensor in boiling water

Check sensors

Testing lambda sensor

Sensing trouble

 

ABS-olute non-sense

Sensor fault

'Ping' hassle

Wrong readings

Barely audible

Faulty sensor

Faulty 02 sensor

02 sensor

Lambda symbol

Oxygen sensor

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