I own a 2000 S430 (W220) that is having some PSE issues. (Soft close doors do not work/but I don't care about that. Trunk will not pop via key fob or with interior button/I would like that fixed. Can still open with key) I have several questions because as I delve further and further into this pump issue, I'm getting multiple red flags and I'm trying to NOT mortgage my children;

1. Is it 100% the pse pump? Or can the soft close/trunk issues have an individual component malfunctioning? If it's the pump, can the pump work for some parts of the car and not others? Is this a sign that the pump is slowly dying and I should replace it?

2.Is the security alarm part of the pse pump? Lately, it has been self-activating (sounding)approx. 7-10 mins after locking the car and walking away. (soft close and trunk issue have not been working for about 3 years, (but I'd like the truck fixed), the security alarm thing just started a month or so ago. And its hit/miss as whether or not it will sound the alarm, which makes me wonder if it's part of the PSE pump that is going.)

3. My model number PSE pump is 220 800 06 48, which I have removed. In researching a replacement, I see that the replacement model number has changed and ends in 12 48 now. In further researching, I see that several MB model numbers all have been replaced with this 220 800 12 48 part number. (See pic)Is it reasonable to assume that a 220 800 02 48 would work as well, given the above information? (see pic of ebay posting)

4. In my zeal to remove the PSE pump, I may or may not have followed the pdf "removing and replacing PSE pump steps" exactly and in same order, (pdf graciously supplied by this forum ;thank you for that, albeit post pse removal!). If I follow the install portion of that pdf, will that suffice? Or should I just give up now and mortgage those children?

5.. Is it absolutely a requirement that the PSE pump will need to be recoded by a Star Diagnostic machine? Earlier, I saw a post by mbdoc that stated 99% of replacement pse pumps do not need to be recoded. Do I just wing it and hope it takes? Are their any indicators (other than works/doesn't work, or car bursting into flames) that I should be looking for? Anything I need to watch for down the road?

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You can put late pumps in early cars but not the other way around. Door locks will probably function ok but to ensure the pump matches the equipment installed in the car it will have to be programmed with a star diagnosis system.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

You can swap the pump around, but it has to be the same matching part number. I don't believe it has to be reprogrammed unless its new.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

So, If I have model number 220-800-06-48, then a 220-800-08-48 is a new model? Or a 12-48 is a newer model?(The higher the number the newer the model?)