Peugeot 308: Removing - refitting : Oxygen sensors

ESSENTIAL : Observe the safety and cleanliness recommendations .

ESSENTIAL : All personnel carrying out work on a vehicle fitted with traction batteries must have received specific electric vehicle training and be authorised to work on these vehicles (observe the regulations in force in the respective country).

CAUTION : For any operation on an oxygen sensor : Cleaning of the upstream and downstream oxygen sensor connector must be undertaken dry. It is strictly prohibited to use solvents or contact greases for cleaning the connectors of the upstream and downstream oxygen sensors.

ESSENTIAL : Wait at least one hour before carrying out any work on the exhaust line.

1. Tooling

N.B. : Use the products recommended by the manufacturer .

Tool	Reference	Description
	[4386-T][EN-51419]	22 mm long socket

2. Location

(1) Upstream oxygen sensor.

(2) Downstream oxygen sensor.

3. Upstream oxygen sensor

3.1. Removing

CAUTION : Perform the operations that are required prior to a disconnection of the ancillaries battery .

CAUTION : In the case of a vehicle with 2 batteries, carry out the specific operations for disconnecting and reconnecting the ancillaries batteries.

Disconnect the ancillaries battery or batteries (depending on equipment).

Remove the engine cover .

Disconnect the connector (at "a").

Unclip the connector (at "b").

Remove the upstream oxygen sensor (1) ; Using the tool [4386-T / EN-51419].

3.2. Refitting

CAUTION : Observe the tightening torques .

Refit the upstream oxygen sensor (1) ; Using the tool [4386-T / EN-51419].

Clip connector in place (at "b").

Reconnect the connector (at "a").

CAUTION : Perform the operations that are required after reconnecting the ancillaries battery .

CAUTION : In the case of a vehicle with 2 batteries, carry out the specific operations for disconnecting and reconnecting the ancillaries batteries.

Reconnect the ancillaries battery or batteries (depending on equipment).

Refit the engine cover .

4. Downstream oxygen sensor

CAUTION : Protect the engine cooling radiator.

4.1. Removing

Place the vehicle on a 2-post lift .

CAUTION : Perform the operations that are required prior to a disconnection of the ancillaries battery .

CAUTION : In the case of a vehicle with 2 batteries, carry out the specific operations for disconnecting and reconnecting the ancillaries batteries.

Disconnect the ancillaries battery or batteries (depending on equipment).

Remove the under-engine protector.

Disconnect the connector (at "c").

Unclip the connector (at "d").

Release the electrical harness (at "e").

Remove the downstream oxygen sensor (2) ; Using the tool [4386-T] / [EN-51419].

4.2. Refitting

CAUTION : Observe the tightening torques .

Refit the downstream oxygen sensor (2) ; Using the tool [4386-T] / [EN-51419].

Reconnect the connector (at "c").

Clip connector in place (at "d").

Position the electrical harness (at "e").

Refit :

• The under-engine protector
• The vehicle to its wheels

CAUTION : Perform the operations that are required after reconnecting the ancillaries battery .

CAUTION : In the case of a vehicle with 2 batteries, carry out the specific operations for disconnecting and reconnecting the ancillaries batteries.

Reconnect the ancillaries battery or batteries (depending on equipment).