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Regular checking, timely replacement
Lambda sensors are vital engine components – essential for reliable engine operation and correct emission values. Numerous factors may impair proper operation of the lambda sensor:
- Environmental influences such as salt and dirt.
- Considerable temperature fluctuations.
- Poor fuel quality.
- Soot and oil residue in the exhaust gas.
To avoid possible engine damage and increased fuel consumption – and thus a higher CO2 impact level - the lambda sensor should be checked every 30 000 km and renewed as a precautionary measure at the recommended replacement intervals.
Prerequisite for lambda sensor diagnosis
The engine mechanical system and the ignition system must be in proper working order.
Lambda sensor diagnosis involves the following steps:
- Fault memory read-out and
checking of actual values in self-diagnosis.
- Checking of signal patterns
(in line with trouble-shooting instructions on ESI[tronic]).
- Checking physical conditions and security of wires and connectors.
If these diagnostic steps reveal any irregularities, remove the lambda sensor and - in the event of severe contamination - heed the information given under the fault images.
Please note the steps listed under "Prerequisite for lambda sensor diagnosis".
Close x 
Condition of lambda sensor:
Greenish colored, grainy contamination.
Possible cause:
Anti-freeze has escaped and entered the combustion chamber.
Action:
Replace the lambda sensor. Check the engine block, cylinder head, intake manifold and cylinder head gasket for wear and cracks.
Close x 
Condition of lambda sensor:
Blackened, with oily contamination.
Possible cause:
Excessive oil consumption.
Action:
Check the valve guides and seals for possible wear. Replace the lambda sensor.
Close x 
Condition of lambda sensor:
Dark brown contamination.
Possible cause:
Fuel-air mixture too rich.
Action:
Check the fuel pressure. Replace the lambda sensor.
Close x 
Condition of lambda sensor:
Reddish or white contamination.
Possible cause:
Gasoline fuel additives.
Action:
Avoid using fuel additives. Replace the lambda sensor.
Close x 
Condition of lambda sensor:
Break in cable.
Possible cause:
Cable strained.
Action:
Replace the lambda sensor. Make sure the new cable is not too taut and routed correctly.
Close x 
Condition of lambda sensor:
Damage to cable sheath.
Possible cause:
Flying stones or impact damage.
Action:
Replace the lambda sensor.
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