New Routing Of Wiring For O2 Sensors (25-0010)

Publication date: 2000-02-01
Reference number: 25-0010

NEW ROUTING OF WIRING FOR O2 SENSORS

TECHNICAL SERVICE BULLETIN

Reference Number(s): 25-0010, Date of Issue: February 2000

VOLVO:	1997-1998 850, S70/V70/C70
SECTION:	2
GROUP:	25
NO.:	0010

Superceded Bulletin(s): 25-0019, Date of Issue: June 1999

NOTE: Reference: This Service Bulletin replaces the previous Service Bulletin 2-25-0010 from June 1999, which should be discarded.

NOTE: Vehicles involved: B52X4X

BACKGROUND

To prevent contamination from reaching the probe's reference air, new routing has been developed for sensor wiring.

If one oxygen sensor is replaced, the new adapter wiring must be installed for both sensors.

REPLACING THE FRONT HEATED OXYGEN SENSOR (HO2S)

MATERIALS

Description	Quantity	Part No.
Heated Oxygen Sensor (HO2S) kit (includes adapter cable harness)	1	9202719-2
Adapter Cable Harness, front	1	9202715-0
Tie strap	2	948211-8

REPLACING THE REAR HEATED OXYGEN SENSOR (HO2S) B52X4S MY 97-98, B5234T MY 97

MATERIALS

Description	Quantity	Part No.
Heated Oxygen sensor (HO2S) kit (includes adapter cable harness)	1	9202720-0
Adapter Cable harness, rear	1	9202714-3
Tie strap	2	948211-8

REPLACING THE REAR HEATED OXYGEN SENSOR (HO2S) B5254T MY 97-98, B5234T MY 98

MATERIALS

Description	Quantity	Part No.
Heated Oxygen Sensor (HO2S) kit (includes adapter cable harness)	1	9202721-8
Adapter Cable Harness, rear	1	9202714-3
Tie strap	2	948211-8

MOUNTING HEATED O2 SENSOR

Heated O2 sensor, mounting

Preparation (see Fig 1 )
1. Turbocharged engines
  Remove:
  - Fresh air intake hose between air cleaner (ACL) housing and turbocharger (TC).
2. Naturally aspirated engines
  Remove:
  - the preheating hose.
Fig 1: Preparation
Removing/installing heated O2 sensor (see Fig 2 )
Remove the front heated O2 sensor. Use tool no. 999 5543

Install a new heated O2 sensor.

NOTE: AWD. Replace front O2 sensor from the engine compartment.

Fig 2: Replacing Heated O2 Sensor
Installing adapter wiring
NOTE: The illustrations only illustrate one of the adapter wiring systems, but the same method applies to both front and rear O2 sensor.

When replacing the heated O2 sensor adapter wiring (A), which is included in the kit, install it between the existing cable harness and the heated O2 sensor. See Fig 3 .

Fig 3: Installing Adapter Wiring

Form the adapter wiring (A) into a loop.

Install a tie strap as illustrated in Fig 4 .

NOTE: Ensure that the ends (B) of the adapter wiring protective sheath point downwards so that moisture does not gather in the protective sheath.

This illustration (see Fig 4 ) displays a late version of the heated O2 sensor cable bracket. (Early type bracket is shown in the next step.)

Fig 4: Installing Tie Strap

On AWD cars the cable for the front heated O2 sensor should be routed over the fresh air intake hose.

NOTE: Ensure that the ends of the adapter wiring protective sheath point downwards so that moisture does not gather in the protective sheath.

This illustration (see Fig 5 ) displays an early version of the heated O2 sensor cable bracket.

Fig 5: Early Version of Heated O2 Sensor Cable Bracket
Installing fresh air intake hose (see Fig 1 )
1. Turbocharged engines
  Install fresh air intake hose.
2. Naturally aspirated engines
  Install preheating hose.
  
  Erase diagnostic trouble code (DTC).
  
  Test drive and check that no new diagnostic trouble codes (DTCs) have been stored.

WARRANTY STATEMENT : Claims may be submitted under the New Car Warranty when there is a documented customer complaint, using claim type 01.

WARRANTY CLAIMS INFORMATION

Operation No.	Labor Description	Time Allowance
25960-2	Replace the heated oxygen sensor (HO2S) according to SB 2-25-0010	0.6 hr