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‒ Check readouts for lambda control in display zones 1 and 2.
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Display zones
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1
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2
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3
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4
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Display Group 033: Lambda control
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Display
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xx.x %
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x.xxx V
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Indicates
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Lambda control Bank 1
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Lambda probe voltage Bank 1
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Range
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-25.0...25.0 %
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0.000...1.000 V
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Specification
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Between -10.0 and 10.0 % the readout should fluctuate by at least 2 %
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Between 0.000 and 1.000 V the voltage should fluctuate by about 0.3 V
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Note
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If readout does not match specification =>Further notes, Page 24-79
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If readout does not match specification =>Reading Display Group 033, Page 24-82
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Further notes
If the readout in display zone 1 does not match the specification, or if the readout does not fluctuate by at least 2 %:
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‒ Take car for a test drive to free lambda probe of any deposits, then repeat the test.
If the readout in display zone 1 still does not match the specification even after the test drive, or if the readout still does not fluctuate by at least 2 %:
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‒ Test the basic voltage => Page 24-83.
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‒ Test the lambda probe heating=> Page 24-100.
Models with engine code letters ANB:
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‒ Check the lambda probe (before the catalytic converter) for ageing => Page 24-85
Reading Display Group 032
Display zone 1 / 2
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Possible cause of fault
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Fault remedy
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Lambda learned values between -10.0 and -25.0 %
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- Air leak in intake system (pressure side between turbocharger and intake manifold)
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- Check intake system for leaks and eliminate unmetered air => Page 24-67
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- Oil dilution
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- Change oil or drive car at moderate to high speeds on out-of-town roads
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- High oil consumption
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- Air mass meter defective
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- Test air mass meter => Page 24-59
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- Solenoid valve for activated charcoal filter sticking in open position
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- Test solenoid valve for activated charcoal filter => Page 24-123
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- Fuel pressure too high
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- Test fuel pressure regulator => Page 24-32
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- Injector does not close
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- Test injectors => Page 24-37
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- Lambda probe heating defective - Lambda probe defective
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- Test lambda probe heating => Page 24-100
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Reading Display Group 032
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Display zone 1 / 2
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Possible cause of fault
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Fault remedy
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Lambda learned values between 10.0 and 25.0 %
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- Unmetered air in intake tract
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- Check intake system for leaks and eliminate unmetered air => Page 24-67
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- Fuel pressure too low
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- Test fuel pressure regulator => Page 24-32
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- Air mass meter defective
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- Test air mass meter => Page 24-59
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- Lambda probe heating defective - Lambda probe defective
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- Test lambda probe heating => Page 24-100
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- Injector not opening or only opening partially
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- Test injectors => Page 24-37
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- Solenoid valve for activated charcoal filter sticking
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- Test solenoid valve for activated charcoal filter => Page 24-123
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Reading Display Group 033
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Display zone 2
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Possible cause of fault
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Fault remedy
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Approx. 0.450 V (constant)
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- Open circuit in wire 4 between lambda probe and control unit
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- Test basic voltage => Page 24-83
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- Open circuit in wire 3 between lambda probe and control unit
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Approx. 0.200 V (constant)
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- Lambda probe defective
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- Renew lambda probe
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More than 1.100 V
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- Short to positive in wire 4 between lambda probe and control unit
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- Test lambda probe (before catalytic converter) => Page 24-84
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Less than 0.150 V
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- Short to earth in wire 4 between lambda probe and control unit
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