Exhaust Pressure Sensor: Service and Repair

Exhaust Pressure Sensor 1 G450

• The exhaust pressure sensor 1 determines the particulate filter load condition. It is connected between the Exhaust Gas Recirculation (EGR) pipe and the particulate filter.

Component location, refer to => [ Front Exhaust Pipe with Particulate Filter Overview ] Front Exhaust Pipe with Particulate Filter Overview.

Removing

- Remove the engine cover. Refer to => [ Engine Cover ] Engine Cover.

- Remove the nuts - arrows - and then remove the heat shield - 1 - from the diesel particulate filter.






- Remove the bolts - arrows -.






- Release and disconnect the connector - 3 -.

- Unclip the exhaust pressure sensor 1 - 1 - from the bracket - 2 -.

- Remove the bracket - 2 -.

- Loosen the clamps and remove the wires - 4 - from the exhaust pressure sensor 1 - 1 -.

Installing

Install in reverse order of removal. When doing this note the following:

• Before installing the control lines leading from exhaust pressure sensor 1 to the particulate filter, clean them with compressed air to make sure they are not plugged or iced over by condensation.

• Check for secure fit and leaks.

• In case the particulate filter pressure lines were loosened, tighten the pressure lines, refer to => [ Front Exhaust Pipe with Particulate Filter Overview ] Front Exhaust Pipe with Particulate Filter Overview.

Perform an adaptation after replacing the exhaust pressure sensor 1 and/or the particulate filter. The procedures are also described in Guided Fault Finding.

Enter the correct vehicle into Guided Fault Finding.

- Press the "GO TO" button.

- Select "Function/component selection".

- Select "drive".

- Select engine code.

- "01 - On Board Diagnostic (OBD) capable systems"

- Select "01 - Diesel Direct Injection- and Preglow System EDC 17".

- Select "01 - Functions".

- Select "01 - reset adaptation value for differential pressure sensor for diesel particulate filter".

Tightening Specifications