Oxygen Sensor Module: Service and Repair

Nitrogen Oxides (NOx) Sensor Module













Removal

NOTICE: Do not use silicone based sprays or lubricants on any components installed onto or around the diesel exhaust system or intake air distribution and filtering system. Silicone reacts with the Nitrogen Oxides (NOx) sensor and may cause permanent damage to the NOx sensor.

1. NOTICE: Make sure the ignition switch is in the OFF position prior to working on the electronic engine controls or the vehicle may be damaged.

Turn the ignition switch to the OFF position.

2. NOTE: Any melting of plastic connectors indicates overheating of the Diesel Particulate Filter (DPF). Address any DPF concerns before installing a new sensor.

Disconnect the Nitrogen Oxides (NOx) sensor electrical connector and the Nitrogen Oxides (NOx) sensor module electrical connector.

3. Remove the 2 bolts and the NOx sensor module.

Installation

1. Install the Nitrogen Oxides (NOx) sensor module and the 2 bolts.
- Tighten to 25 Nm (18 lb-ft).

2. NOTE: Do not apply any type of electrical grease or lubricants to the electrical connectors.

Connect the Nitrogen Oxides (NOx) sensor electrical connector and the Nitrogen Oxides (NOx) sensor module electrical connector.

3. NOTE: This step may not be needed if the calibration levels of the Nitrogen Oxides (NOx) Sensor Module and PCM are coordinated (matched).

Using the scan tool, update the NOx sensor module and the PCM to the latest calibration level following the on-screen instructions.