Mitsubishi Galant (2004+). Manual - part 1662

EXHAUST MANIFOLD

TSB Revision

INTAKE AND EXHAUST

15-19

Required Special Tools:

• MB991953: Oxygen sensor wrench

• MD998770: Oxygen sensor wrench

REMOVAL SERVICE POINTS

.

<<A>> LEFT BANK HEATED OXYGEN SENSOR 
(FRONT)/RIGHT BANK HEATED OXYGEN SENSOR 
(FRONT)/RIGHT BANK HEATED OXYGEN SENSOR (REAR) 
REMOVAL
Use special tool MD998770 to remove the heated oxygen sen-
sor.

.

<<B>> LEFT BANK HEATED OXYGEN SENSOR (REAR) 
REMOVAL
Use special tool MB991953 to remove the heated oxygen sen-
sor.

INSTALLATION SERVICE POINTS

.

>>A<< RIGHT BANK HEATED OXYGEN SENSOR 
(REAR)/RIGHT BANK HEATED OXYGEN SENSOR 
(FRONT)/LEFT BANK HEATED OXYGEN SENSOR (FRONT) 
INSTALLATION
Use special tool MD998770 to install the heated oxygen sen-
sor.

.

ACX02426 AB

MD998770

AC301966

AC

HEATED OXYGEN 
SENSOR

MB991953

ACX02426 AB

MD998770

EXHAUST MANIFOLD

TSB Revision

INTAKE AND EXHAUST

15-20

>>B<< LEFT BANK HEATED OXYGEN SENSOR (REAR) 
INSTALLATION
Use special tool MB991953 to install the heated oxygen sensor.

INSPECTION

M1151003400587

Check the following points; replace the part if a problem is 
found.

.

Exhaust Manifold Check
1. Check for damage or cracking of any part.
2. Using a straight edge and a feeler gauge, check for 

distortion of the cylinder head installation surface.

Standard value: 0.15 mm (0.006 inch) or less 
Limit: 0.20 mm (0.008 inch)

AC301966

AC

HEATED OXYGEN 
SENSOR

MB991953

EXHAUST PIPE AND MAIN MUFFLER

TSB Revision

INTAKE AND EXHAUST

15-21

EXHAUST PIPE AND MAIN MUFFLER

REMOVAL AND INSTALLATION

M1151008700334

Required Special Tool:

• MB991953: Oxygen sensor wrench

AC306968

1

2

3

3

4

5

6

7

8

9

10

11

13

9

14

15 16

17

18

N

N

N

N

44 ± 5 N·m
33 ± 3 ft-lb

44 ± 5 N·m
33 ± 3 ft-lb

35 ± 4 N·m
26 ± 3 ft-lb

49 ± 4 N·m
37 ± 3 ft-lb

22 ± 4 N·m
16 ± 3 ft-lb

49 ± 9 N·m
37 ± 6 ft-lb

49 ± 4 N·m
37 ± 3 ft-lb

45 ± 5 N·m
34 ± 3 ft-lb

12 ± 2 N·m
107 ± 17 in-lb

12 ± 2 N·m
107 ± 17 in-lb

AB

<2.4L ENGINE>

12 ± 2 N·m
107 ± 17 in-lb

AC306969

1

2

3

3

4

5

6

7

8

10

11

12

13

17

18

N

N

N

N

35 ± 4 N·m
26 ± 3 ft-lb

49 ± 4 N·m
37 ± 3 ft-lb

22 ± 4 N·m
16 ± 3 ft-lb

49 ± 9 N·m
37 ± 6 ft-lb

49 ± 4 N·m
37 ± 3 ft-lb

45 ± 5 N·m
34 ± 3 ft-lb

12 ± 2 N·m
107 ± 17 in-lb

12 ± 2 N·m
107 ± 17 in-lb

AB

N

49 ± 9 N·m
37 ± 6 ft-lb

14

<3.8L ENGINE>

15

12 ± 2 N·m
107 ± 17 in-lb

MAIN MUFFLER REMOVAL 
STEPS

1.

MAIN MUFFLER

2.

SEAL RING

3.

HANGER
CENTER EXHAUST PIPE 
REMOVAL STEPS

4.

CROSSMEMBER STAY

5.

FRONT FLOOR BACKBONE 
BRACE

6.

CENTER EXHAUST PIPE

2.

SEAL RING

7.

GASKET

8.

HANGER

FRONT EXHAUST PIPE 
REMOVAL STEPS

<<A>>

>>A<<

9.

HEATED OXYGEN SENSOR 
<2.4L ENGINE>

10. FRONT NO.1 EXHAUST PIPE
11. GASKET
12. GASKET <3.8L ENGINE>
13. SEAL RING
14. FRONT NO.2 EXHAUST PIPE
7.

GASKET

15. HANGER
16. PROTECTOR <2.4L ENGINE>
17. CENTER UNDER FLOOR HEAT 

PROTECTOR

18. FRONT UNDER FLOOR HEAT 

PROTECTOR

SPECIFICATIONS

TSB Revision

INTAKE AND EXHAUST

15-22

REMOVAL SERVICE POINT

.

<<A>> HEATED OXYGEN SENSOR REMOVAL
Use special tool MB991953 to remove the heated oxygen sen-
sor.

INSTALLATION SERVICE POINT

.

>>A<< HEATED OXYGEN SENSOR INSTALLATION
Use special tool MB991953 to install the heated oxygen sensor.

SPECIFICATIONS

FASTENER TIGHTENING SPECIFICATIONS

M1151006800379

AC301966

AC

HEATED OXYGEN 
SENSOR

MB991953

AC301966

AC

HEATED OXYGEN 
SENSOR

MB991953

ITEM

SPECIFICATION

Air cleaner
Air cleaner bolt

8.8 

± 1.0 N⋅m (78 ± 9 in-lb)

Air cleaner bracket bolt and nut

12 

± 2 N⋅m (102 ± 22 in-lb)

Air cleaner resonator bolt <2.4L ENGINE>

3.0 

± 0.5 N⋅m (27 ± 4 in-lb)

Air cleaner resonator bolt

8.8 

± 1.0 N⋅m (78 ± 9 in-lb)

Air intake hose clamp bolt

4.0 

± 0.9 N⋅m (35 ± 8 in-lb)

Mass airflow sensor bolt

1.8 

± 0.6 N⋅m (16 ± 5 in-lb)

Exhaust manifold <2.4L ENGINE>
Exhaust manifold bracket A bolt

35 

± 6 N⋅m (26 ± 4 ft-lb)

Exhaust manifold bracket B bolt

44 

± 5 N⋅m (33 ± 3 ft-lb)

Exhaust manifold cover bolt

14 

± 1 N⋅m (120 ± 13 in-lb)

Exhaust manifold nut

49 

± 5 N⋅m (36 ± 4 ft-lb)

Heated oxygen sensor

44 

± 5 N⋅m (33 ± 3 ft-lb)