17B-4
PETROL INJECTION
Oxygen sensors: Removal - Refitting
F4R
17B
REMOVAL OF THE UPSTREAM OXYGEN
SENSOR
I - REMOVAL PREPARATION OPERATION
a Remove the front engine cover.
a Remove:
- the bolts (1) from the turbocharger heat shield,
- the turbocharger heat shield.
II - OPERATION FOR REMOVAL OF PART
CONCERNED
a Disconnect the upstream oxygen sensor connector
(2) .
Essential special tooling
Mot. 1495-01 22 mm socket for removing/
refitting oxygen sensors.
Tightening torquesm
upstream oxygen sen-
sor
34 N.m
downstream oxygen
sensor
34 N.m
IMPORTANT
Wear heat protective gloves during the operation.
IMPORTANT
Wear protective gloves during the operation.
WARNING
To prevent the surrounding components from ove-
rheating, do not damage (tear, pierce, bend, etc.) a
heat shield.
Any damaged heat shields must be replaced.
WARNING
Do not use any product designed to improve the
electrical contact in the injection computer and oxy-
gen sensor connectors or on the bodies of the oxy-
gen sensors.
Failure to respect this advice causes the oxygen
sensor to malfunction and results in failure to com-
ply with the emission control standard.
WARNING
If the connections are corroded, repair the wiring
(see Wiring: Precautions for repair) (Technical
Note 6015A, 88A, Wiring).
134649
135744
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