Correction
Inspecting the SCR catalyst:
Check the part number of the SCR catalyst (1). If the part number is not 18 30 8 509 753 (E70) or 18 30 8 509 750 (E90), the SCR catalyst will need to be replaced. Follow Repair Instruction 18 00 020 "Remove and refit complete exhaust system" to replace the SCR catalyst.
Note:
If replacement is necessary, also perform the SCR mixer check/replacement at the same time.
Inspecting the mixer:
Remove the front pipe of the SCR catalyst to gain access to the mixer.
The original style mixer has a multiple fin arrangement (1). This mixer will need to be replaced with P/N 18 30 8 513 445 (E70) or P/N 18 30 8 512 438 (E90).
If the updated mixer has already been installed, it will have one set of fins (2). No replacement is necessary. Reinstall the SCR front pipe to the down pipe of the DPF.
Inspecting the EGR valve:
Remove the charge air pipe at the throttle (ignition off). Using a flashlight, look through the throttle (1) and inspect the EGR valve.
The updated EGR valve (P/N 11 71 8 517 217 or P/N 11 71 8 512 526) has the valve and seat directly in the airstream of the throttle (1). If this valve is installed, no further action is needed. Reinstall the charge air pipe.
The original EGR valve has a diffuser in the airstream flow from the throttle (2). The valve for EGR actuation is seated further into the EGR airstream. Replace this valve with P/N 11 71 8 512 526 (Repair Instruction 11 71 501).
The DDE will also need to be programmed as part of the Recall. If the EGR valve is replaced, the DDE will need to be programmed after the new EGR valve is installed. This new software package contains the necessary software to adapt to the new EGR valve strategy.
Program the vehicle using ISTA/P 2.46.3 or later.
Note that ISTA/P will automatically reprogram and code all programmable control modules that do not have the latest software.
For information on programming and coding with ISTA/P, refer to CenterNet / Aftersales Portal / Service / Workshop Technology / Vehicle Programming.