Renault Laguna III Manual page 1364

Oxygen sensors: Removal - Refitting
V4Y
Special tooling required
Mot. 1495 22 mm socket for removal -
refitting of oxygen sensors -
1/2" square drive and 24 mm
hexagonal ext.
Tightening torquesm
front row downstream
oxygen sensor
front row upstream oxy-
gen sensor
back row downstream
oxygen sensor on the
catalytic pre-converter
back row upstream oxy-
gen sensor on the
exhaust manifold
alternator positive termi-
nal nut
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 the repair) (Techni-
cal Note 6015A, 88A, Wiring).
REMOVAL
I - REMOVAL PREPARATION OPERATION
a Position the vehicle on a two-post lift (see Vehicle:
Towing and lifting) (02A, Lifting equipment).
a Disconnect the battery (see Battery: Removal - Re-
fitting) (80A, Battery).
PETROL INJECTION
50 N.m
50 N.m
50 N.m
50 N.m
15 N.m
17B-26
a Remove:
- the engine cover,
- the engine undertray bolts,
- the engine undertray.
1 - Front row downstream oxygen sensors
a Remove the alternator positive terminal nut.
a Move aside the alternator wiring.
17B