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HO2S2
EC-869
[QR (WITHOUT EURO-OBD)]
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HO2S2 PFP:226A0
Component Description BBS001TW
The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the oxygen level in the exhaust gas.
Even if switching characteristics of the heated oxygen sensor 1 are
shifted, the air-fuel ratio is controlled to stoichiometric, by the signal
from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates volt-
age from approximately 1V in richer conditions to 0V in leaner condi-
tions.
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.
CONSULT-II Reference Value in Data Monitor Mode BBS001TX
Specification data are reference values.
SEF327R
MONITOR ITEM CONDITION SPECIFICATION
HO2S2 (B1) Revving engine from idle to 3,000 rpm quickly after the following conditions
are met.
● Engine: After warming up
● Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute
and at idle for 1 minute under no load
0 - 0.3V ←→ Approx. 0.6 - 1.0V
HO2S2 MNTR (B1) LEAN ←→ RICH
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