Skoda OCTAVIA MK1 Service Manual page 158

5 Display does
not fluctuate
(lambda
control on stop
in direction
rich or lean;
see display
group 099)
constant 255
constant 80
constant 0
6 low lambda
learned values
t large unmetered air volume
t Spark plug defective
t Spark plug connector defective
t Holding pressure too low or too high
t Injection valve defective
Coolant temperature sender -G62 -
t
faulty
Activated charcoal filter solenoid valve
t
-N80- defective
t Lambda probe heater does not operate
t Lambda probe defective or dirty
Short circuit to positive by: Lambda
t probe -G39- or signal line or engine
control unit
Line interruption through: fuse, lambda
t probe -G39- or signal line or engine
control unit
Short circuit to positive by: Lambda
t probe -G39 - or signal line or engine
control unit
low lambda idle learned values at normal
lambda partial load learned values: slight
t
dilution of oil (higher fuel content in the
oil)
t Injection valve(s) leaking
t Fuel pressure too high
t Solenoid valve 1 for activated charcoal
158
→ Chapter.
Eliminate cause of
–
unmetered air.
Test spark plugs and
–
connector.
Test fuel pressure
–
regulator and holding
pressure → Chapter.
Testing injection valves
–
→ Chapter.
Interrogate fault memory
–
→ Chapter or check -G62-
→ Chapter.
Perform final control
–
diagnosis → Chapter
check -N80- → Chapter.
Check lambda probe
–
heater → Chapter.
Interrogate fault memory
–
→ Chapter or check
lambda probe →
Read measured value
–
block, display group 099.
Checking lambda probe
–
→ Chapter.
Checking lambda probe
–
→ Chapter.
Checking lambda probe
–
→ Chapter.
Disappears after driving
–
on motorway or changing
oil.
– Check fuel pressure
or
Chapter.