O2 sensor SUBARU LEGACY 1999 Service Repair Manual

C: INSTALLATION
CAUTION:
Failure to do this might damage roll connector.
1) Before installing combination switch, check to
ensure that combination switch is off and front
wheels are set in the straight ahead position.
2) Install column cover and center roll connector.
3) Install steering wheel in neutral position. Care-
fully insert roll connector pin (A) into hole on steer-
ing wheel.
NOTE:
If steering wheel angle requires fine adjustment,
adjust tie-rod.
B5M0457A
4) Install airbag module and lower cover in the
reverse order of removal.
7. Front Sub Sensor
A: REMOVAL AND INSTALLATION
CAUTION:
IIf the front end of the vehicle body is dam-
aged by a collision, be sure to check the left
and right front sub sensors, even if the airbag
was not inflated. If any damage to the sensor or
any deformation of the sensor mount is found,
replace with a new genuine part.
G5M0291
IWhen painting or performing sheet metal
work on the front part of vehicle body, includ-
ing the front wheel apron, front fender and
front side frame, take utmost care not to apply
dryer heat, painting mist, or the flame of the
welding burner directly to the front sub sen-
sors and wire harness of the airbag system.
G5M0310
1. FRONT SUB SENSOR HARNESS
1) Turn ignition switch off.
2) Disconnect ground cable from battery and wait
for at least 20 seconds before starting work.
3) Remove lower cover.
16
5-5[W6C0]SERVICE PROCEDURE
7. Front Sub Sensor

4) Disconnect airbag connector (AB3) and (AB8)
below steering column.
CAUTION:
Do not reconnect airbag connector at steering
column until front sub sensors are securely re-
installed.
G5M0312
5) Remove front side sill cover and then discon-
nect front sub sensor connector. [M2F2].>
B5M0517
6) Remove front wheel and mud guard.
7) Disconnect connector from front sub sensor
assembly.
B5M0518
8) Remove wiring harness clips.
G5M0315
9) Remove grommet and then detach front sub
sensor harness.
G5M0316
2. FRONT SUB SENSOR ASSEMBLY
1) Turn ignition switch off.
2) Disconnect ground cable from battery and wait
for at least 20 seconds before starting work.
3) Remove front wheel and mud guard.
4) Disconnect connector from front sub sensor
assembly.
B5M0518
17
[W7A2]5-5SERVICE PROCEDURE
7. Front Sub Sensor

5) Remove front sub sensor.
B5M0519
6) Installation is in the reverse order of removal.
8. Side Airbag Sensor
A: REMOVAL AND INSTALLATION
CAUTION:
IIf the side of the vehicle body is damaged by
a collision, be sure to check the left and right
side airbag sensors, even if the airbag was not
inflated. If any damage to the sensor or any
deformation of the sensor mount is found,
replace with a new genuine part.
IWhen painting or performing sheet metal
work on the side part of vehicle body, including
the side sill, center pillar, front and rear doors,
take utmost care not to apply dryer heat, paint-
ing mist, or the flame of the welding burner
directly to the side airbag sensors and wire
harness of the airbag system.
1) Turn ignition switch off.
2) Disconnect ground cable from battery and wait
for at least 20 seconds before starting work.
3) Remove center pillar lower. [W5A2].>
4) Remove two TORX
Tbolts and then detach side
airbag sensor while disconnecting connector.

B5M0520
5) Installation is in the reverse order of removal.
18
5-5[W8A0]SERVICE PROCEDURE
8. Side Airbag Sensor

5) Remove front sub sensor.
B5M0519
6) Installation is in the reverse order of removal.
8. Side Airbag Sensor
A: REMOVAL AND INSTALLATION
CAUTION:
IIf the side of the vehicle body is damaged by
a collision, be sure to check the left and right
side airbag sensors, even if the airbag was not
inflated. If any damage to the sensor or any
deformation of the sensor mount is found,
replace with a new genuine part.
IWhen painting or performing sheet metal
work on the side part of vehicle body, including
the side sill, center pillar, front and rear doors,
take utmost care not to apply dryer heat, paint-
ing mist, or the flame of the welding burner
directly to the side airbag sensors and wire
harness of the airbag system.
1) Turn ignition switch off.
2) Disconnect ground cable from battery and wait
for at least 20 seconds before starting work.
3) Remove center pillar lower. [W5A2].>
4) Remove two TORX
Tbolts and then detach side
airbag sensor while disconnecting connector.

B5M0520
5) Installation is in the reverse order of removal.
18
5-5[W8A0]SERVICE PROCEDURE
8. Side Airbag Sensor

(3) Remove air intake duct (A) and (B) as a
unit.
B2M2012
(4) Remove resonator chamber.
B2M2306
3) Remove air cleaner upper case and air cleaner
element. (Except California SPEC. vehicle)
(1) Disconnect mass air flow sensor connector.
B2M2018
(2) Remove two clips securing air cleaner
upper cover.
(3) Loosen the clamp screw and separate air
cleaner upper cover from air intake duct.
(4) Remove air cleaner element.
B2M2290
4) Remove #1 spark plug cord by pulling boot, not
cord itself.
B6M0922A
5) Remove spark plug with the spark plug socket.
B6M0923
6) Installation is in the reverse order of removal.
Tightening torque (Spark plug):
20.6
±2.9 N´m (2.10±0.30 kg-m, 15.19±2.14
ft-lb)
21
[W3A1]6-1SERVICE PROCEDURE
3. Spark Plug

(3) Remove air intake duct (A) and (B) as a
unit.
B2M2012
(4) Remove resonator chamber.
B2M2306
3) Remove air cleaner upper case and air cleaner
element. (Except California SPEC. vehicle)
(1) Disconnect mass air flow sensor connector.
B2M2018
(2) Remove two clips securing air cleaner
upper cover.
(3) Loosen the clamp screw and separate air
cleaner upper cover from air intake duct.
(4) Remove air cleaner element.
B2M2290
4) Remove #3 spark plug cord by pulling boot, not
cord itself.
B6M0928A
5) Remove spark plug with the spark plug socket.
B6M0925
6) Installation is in the reverse order of removal.
Tightening torque (Spark plug):
20.6
±2.9 N´m (2.10±0.30 kg-m, 15.19±2.14
ft-lb)
23
[W3A3]6-1SERVICE PROCEDURE
3. Spark Plug

Tightening torque (Spark plug):
20.6
±2.9 N´m (2.10±0.30 kg-m, 15.19±2.14
ft-lb)
3. #3 SPARK PLUG
1) Disconnect battery ground cable.
G6M0095
2) Disconnect mass air flow sensor connector.
B6M0557A
3) Remove four clips securing air cleaner upper
cover.
4) Loosen the clamp screw and separate air
cleaner upper cover from air intake duct.
B6M0558
5) Remove air cleaner element.6) Remove #3 spark plug cord by pulling boot, not
cord itself.
B6M0559A
7) Remove spark plug with the spark plug socket.
B6M0560
8) Installation is in the reverse order of removal.
Tightening torque (Spark plug):
20.6
±2.9 N´m (2.10±0.30 kg-m, 15.19±2.14
ft-lb)
4. #4 SPARK PLUG
1) Disconnect battery ground cable.
G6M0095
26
6-1[W3B3]SERVICE PROCEDURE
3. Spark Plug

C: REMOVAL (2500 cc OUTBACK
MODEL)
CAUTION:
All spark plugs installed on an engine, must be
of the same heat range.
Spark plug:
NGK: PFR5B-11
1. #1 SPARK PLUG
1) Disconnect battery ground cable.
G6M0095
2) Disconnect mass air flow sensor connector.
B6M0557A
3) Remove four clips securing air cleaner upper
cover.
4) Loosen the clamp screw and separate air
cleaner upper cover from air intake duct.
B6M0558
5) Remove air cleaner element and air cleaner
case.
B6M0565A
6) Remove #1 spark plug cord by pulling boot, not
cord itself.
B6M0566A
7) After connecting (A) spark plug socket, (B)
extension and (C) Universal Joint to each other,
securely set them over the spark plug in cylinder
head.
B6M0567B
(A) Spark plug socket 16 mm (5/8 in)
(B) Extension
(C) Universal Joint
(D) Extension
(E) Ratchet
8) Cover ABS pipes with a rag to prevent damage.
28
6-1[W3C0]SERVICE PROCEDURE
3. Spark Plug

CAUTION:
When removing spark plug, cover the ATF cool-
ing pipes with a rag to prevent damage.
3. #3 SPARK PLUG
1) Disconnect battery ground cable.
G6M0095
2) Disconnect mass air flow sensor connector.
B6M0557A
3) Remove four clips securing air cleaner upper
cover.
4) Loosen the clamp screw and separate air
cleaner upper cover from air intake duct.
B6M0558
5) Remove air cleaner element and air cleaner
case.
B6M0565A
6) Remove #3 spark plug cord by pulling boot, not
cord itself.
B6M0570A
7) For subsequent procedures, refer to the proce-
dure for #1 spark plug.
4. #4 SPARK PLUG
1) Disconnect battery ground cable.
G6M0095
30
6-1[W3C3]SERVICE PROCEDURE
3. Spark Plug

15. Vehicle Speed Sensor 2
A: GENERAL PRECAUTIONS
(1) Be careful not to drop or bump sensor as this
may break built-in magnet.
(2) Drive key is designed to separate from vehicle
speed sensor 2. Be careful not to lose it or forget
to install.
(3) Vehicle speed sensor 2 is installed in part
(which contains bearings, etc., finished to a high
degree of accuracy). Do not allow foreign matter
(filings, sand, etc.) to get into it.
(4) When checking output of vehicle speed sensor
2 as a single unit, ensure test leads are connected
to their correct terminals. Failure to do this may
damage internal IC.
(5) Discard vehicle speed sensor 2 after removal;
replace with new one.
B: REMOVAL
CAUTION:
IBe careful when removing vehicle speed
sensor 2 immediately after driving vehicle for a
while, as temperature around it is high.
IBefore removing vehicle speed sensor 2,
clean dirt, etc. from surrounding areas. Take
care not to allow foreign matter to get into
mounting hole.
1) Remove collector cover.
2) Disconnect vehicle speed sensor 2 connector.
B2M0211
3) Turn and remove vehicle speed sensor 2.
4) Remove key and packing.
C: INSTALLATION
CAUTION:
IEnsure sensor mounting hole is clean and
free of foreign matter.
IApply grease to tip end of key to prevent key
from falling off sensor.
IAlign tip end of key with key groove on end
of speedometer shaft during installation.
1) Hand tighten vehicle speed sensor 2, then
tighten it using suitable tool.Tightening torque required for sensor to reach bot-
tom of transmission is as follows:
Tightening torque:
0.39 Ð 0.88 N´m (4.0 Ð 9.0 kg-cm, 3.5 Ð
7.8 in-lb)
CAUTION:
IWhen torque must be applied that exceeds
0.88 N´m (9.0 kg-cm, 7.8 in-lb), the key and key
groove on end of speedometer may not be
aligned properly. Remove the key, align it cor-
rectly and reassemble.
ISensor threads are secured by Locktite. The
reassembly must be completed within 5 min-
utes before Locktite dries.
2) Tighten vehicle speed sensor 2 further to speci-
fied torque.
Tightening torque:
5.9
±1.5 N´m (60±15 kg-cm, 52±13 in-lb)
29
[W15C0]6-2SERVICE PROCEDURE
15. Vehicle Speed Sensor 2