sensor SUBARU LEGACY 1999 Service Repair Manual

B: 2500 cc MODEL
S2M0155A
(1) Upper front exhaust pipe cover
CTR
(2) Lower front exhaust pipe cover
CTR
(3) Band RH
(4) Band LH
(5) Upper front exhaust pipe cover
LH
(6) Lower front exhaust pipe cover
LH
(7) Front exhaust pipe
(8) Lower front exhaust pipe cover
RH
(9) Upper front exhaust pipe cover
RH
(10) Gasket
(11) Spring(12) Rear exhaust pipe
(13) Self-locking nut
(14) Gasket
(15) Muffler
(16) Cushion rubber
(17) Clamp
(18) Upper center exhaust pipe cover
(19) Center exhaust pipe
(20) Clamp B
(21) Upper rear catalytic converter
cover
(22) Lower rear catalytic converter
cover
(23) Gasket
(24) Front oxygen sensor
(25) Rear oxygen sensor (California
spec. vehicles)(26) Rear oxygen sensor (Except
California spec. vehicles)
(27) Front catalytic converter
(28) Lower front catalytic converter
cover
(29) Upper front catalytic converter
cover
Tightening torque: N´m (kg-m, ft-lb)
T1:
13±3 (1.3±0.3, 9.4±2.2)
T2:18±5 (1.8±0.5, 13.0±3.6)
T3:30±5 (3.1±0.5, 22.4±3.6)
T4:35±5 (3.6±0.5, 26.0±3.6)
T5:48±5 (4.9±0.5, 35.4±3.6)
4
2-9[C1B0]COMPONENT PARTS
1. Exhaust System

1. Front Exhaust Pipe
A: REMOVAL
1) Disconnect battery ground cable.
B2M1723
2) Disconnect front oxygen sensor connector.
B2M1979A
S2M0127A
3) Disconnect rear oxygen sensor connector.
(2500 cc California spec. vehicles)
S2M0128
4) Lift-up the vehicle.
5) Disconnect rear oxygen sensor connector.
(Except 2500 cc California spec. vehicles)
B2M0312
6) Separate center exhaust pipe from front
exhaust pipe.
S2M0052
7) Remove bolts which hold front exhaust pipe
onto cylinder heads.
CAUTION:
Be careful not to pull down front exhaust pipe
and center exhaust pipe.
S2M0236
5
[W1A0]2-9SERVICE PROCEDURE
1. Front Exhaust Pipe

8) Separate front exhaust pipe from front catalytic
converter.
S2M0053
B: INSTALLATION
1) Install front catalytic converter to front exhaust
pipe.
CAUTION:
Replace gaskets with new ones.
Tightening torque:
30
±5 N´m (3.1±0.5 kg-m, 22.4±3.6 ft-lb)
S2M0053
2) Tighten bolts which hold front exhaust pipe onto
cylinder heads.
Tightening torque:
30
±5 N´m (3.1±0.5 kg-m, 22.4±3.6 ft-lb)
3) Install center exhaust pipe to front exhaust
pipe.
Tightening torque:
35
±5 N´m (3.6±0.5 kg-m, 26.0±3.6 ft-lb)
S2M0052
4) Connect rear oxygen sensor connector. (Except
2500 cc California spec. vehicles)
B2M0312
5) Lower the vehicle.
6) Connect rear oxygen sensor connector. (2500
cc California spec. vehicles)
S2M0128
7) Connect front oxygen sensor connector.
B2M1979A
S2M0127A
6
2-9[W1B0]SERVICE PROCEDURE
1. Front Exhaust Pipe

8) Connect battery ground cable.
B2M1723
2. Center Exhaust Pipe
A: REMOVAL
1) Disconnect battery ground cable.
B2M1723
2) Lift-up the vehicle.
3) Disconnect rear oxygen sensor connector.
(Except 2500 cc California spec. vehicles)
B2M0312
4) Separate center exhaust pipe and rear catalytic
converter assembly from rear exhaust pipe.
B2M0055
7
[W2A0]2-9SERVICE PROCEDURE
2. Center Exhaust Pipe

8) Connect battery ground cable.
B2M1723
2. Center Exhaust Pipe
A: REMOVAL
1) Disconnect battery ground cable.
B2M1723
2) Lift-up the vehicle.
3) Disconnect rear oxygen sensor connector.
(Except 2500 cc California spec. vehicles)
B2M0312
4) Separate center exhaust pipe and rear catalytic
converter assembly from rear exhaust pipe.
B2M0055
7
[W2A0]2-9SERVICE PROCEDURE
2. Center Exhaust Pipe

6) Connect rear oxygen sensor connector. (Except
2500 cc California spec. vehicles)
B2M0312
7) Lower the vehicle.
8) Connect battery ground cable.
B2M1723
3. Rear Exhaust Pipe
A: REMOVAL
1) Separate rear exhaust pipe from center
exhaust pipe.
B2M0055
2) Separate rear exhaust pipe from muffler.
CAUTION:
Be careful not to pull down rear exhaust pipe.
S2M0157
3) Remove rear exhaust pipe bracket from rubber
cushion.
NOTE:
To facilitate removal, apply a coat of SUBARU
CRC or equivalent to pipe bracket in advance.
SUBARU CRC (Part No. 004301003)
S2M0158
9
[W3A0]2-9SERVICE PROCEDURE
3. Rear Exhaust Pipe

6) Connect rear oxygen sensor connector. (Except
2500 cc California spec. vehicles)
B2M0312
7) Lower the vehicle.
8) Connect battery ground cable.
B2M1723
3. Rear Exhaust Pipe
A: REMOVAL
1) Separate rear exhaust pipe from center
exhaust pipe.
B2M0055
2) Separate rear exhaust pipe from muffler.
CAUTION:
Be careful not to pull down rear exhaust pipe.
S2M0157
3) Remove rear exhaust pipe bracket from rubber
cushion.
NOTE:
To facilitate removal, apply a coat of SUBARU
CRC or equivalent to pipe bracket in advance.
SUBARU CRC (Part No. 004301003)
S2M0158
9
[W3A0]2-9SERVICE PROCEDURE
3. Rear Exhaust Pipe

(2) Disconnect radiator outlet hose from ther-
mostat cover.
H2M2515
(3) Remove reservoir tank.
S2M0028
(4) Disconnect ATF cooler hoses from pipes.
(AT vehicles)
B2M0016A
(5) Remove V-belt cover.
B2M2307
(6) Disconnect radiator inlet hose from radiator.
S2M0031
(7) Remove radiator upper bracket, and
remove radiator assembly from vehicle.
B2M2323
8) Collect refrigerant, and remove pressure hoses.
(With A/C)
(1) Place and connect the attachment hose to
the refrigerant recycle system.
(2) Collect refrigerant from A/C system.
(3) Disconnect A/C flexible hoses from A/C
compressor.
B2M2774
9) Remove air intake system.
(1) Disconnect connector from mass air flow
sensor.
(2) Remove air intake chamber, air intake duct
with air cleaner upper cover, and remove air
cleaner element. (Except 2200 cc California
spec. vehicles)
(3) Remove air cleaner case and duct. (2200 cc
California spec. vehicles)
and
8
2-11[W1B0]SERVICE PROCEDURE
1. Engine

(1) Disconnect the following connectors.
H2M2433A
(1) Front oxygen sensor connector
(2) Rear oxygen sensor connector
(California spec. vehicles)
(3) Engine harness connectors
(4) Engine ground terminal
(5) Alternator connector and termi-
nal
(6) A/C compressor connectors
(With A/C)
10
2-11[W1B0]SERVICE PROCEDURE
1. Engine

B2M2776AS2M0204A
12) Remove power steering pump from bracket.
(1) Loosen lock bolt and slider bolt, and remove
front side V-belt.
G2M0286
(2) Remove pipe with bracket from intake mani-
fold.
B2M2309
(3) Remove bolts which install power steering
pump from bracket.
S2M0086
(4) Place power steering pump on the right side
wheel apron.
S2M0087
13) Remove front exhaust pipe and center
exhaust pipe.
(1) Lift-up the vehicle.
(2) Disconnect connector from rear oxygen
sensor. (Except 2500cc California spec.
vehicles)
B2M0335
14
2-11[W1B0]SERVICE PROCEDURE
1. Engine