2 | Electrical line |
4 | Nuts |
5 | Electrical connection |
N37/8 | NOx sensor control unit downstream of SCR catalytic converter |
N37/8b1 | NOx sensor downstream of SCR catalytic converter |
P49.20-A007-06
Warning | Risk of burn injuries, suffocation and poisoning when working on the exhaust system and the components connected to it. Risk of suffocation and risk of poisoning caused by inhalation of gaseous and solid components of the exhaust. Risk of poisoning caused by skin contact with solid components of the exhaust. | Wear protective clothing and safety glasses. Use the extraction system. Move people out of the hazard area. | |
Caution | Risk of injury caused by scraping or cutting body parts on sharp vehicle parts | Always wear protective gloves when working on or near sharp and non-deburred vehicle parts. | |
Topical note | Notes on avoiding damage through contamination and foreign objects | ||
| Remove/install | ||
1 | Remove rear engine compartment lining at bottom. | ||
Installation: Only install the rear engine compartment paneling at the bottom after having completed the leak test. | |||
2 | Remove NOx sensor downstream of SCR catalytic converter (N37/8b1) at exhaust system. | Installation: Coat thread of union nut of NOx sensor downstream of SCR catalytic converter (N37/8b1) with heat-resistant lubricating paste. | |
NOx sensor at front exhaust system | |||
Paste, hot lubrication 1 kg, DBL 6879.20 | |||
Box wrench bit | |||
3 | Expose electric line (2) at engine and at transmission. | ||
4 | Release and disconnect electrical connector at electrical connection (5). | ||
5 | Unscrew nuts (4). | ||
6 | Remove NOx sensor downstream of SCR catalytic converter (N37/8b1) with NOx sensor control unit downstream of SCR catalytic converter (N37/8). | ||
7 | Install in the reverse order. | ||
8 | Connect vehicle diagnosis system and adapt software calibration number in CDI control unit (N3/9). | When replacing NOx sensor downstream of SCR catalytic converter (N37/8b1). | |
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9 | Read out and delete fault memory. | ||
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Warning | Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running. | Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. | |
10 | Perform engine test run and check exhaust system in terms of leak tightness. | ||
11 | Install rear engine compartment lining at bottom. |
000 589 71 03 00
Box wrench bit