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Hi There, and first I'd like to thank your forum (and others) for helping myself and my dad fit both parking sensors and cruise control to my polo and diagnose all manner of faults/tweaks on it. The fault on my polo is intermittent, and almost always follows a day of heavy rain, basically the steering light illuminates (wile driving or manuvering) and the power steering becomes heavy. Once this is triggered the next time the car starts the power steering may not start at all, and by switching it on and off a few times it'll eventually engage (with or without light and heavy steering). Our local VW garage identified it (with my persistence it was water ingress) that the connections of the pump and loom have water ingress and have had corrosion. Price to replace both the pump and the loom at about £1140 fitted! £1140 is a fair bit more than I'd like to spend, and I believe between my dad and I we have the skills to fix this ourselves, or at the least buy the parts for a local garage to fit for a lot less! The technical bits: I have a VCDS system and the fault is diagnosed (and agreed by the VW garage) as a short to ground, although currently its reset I believe it was on the reference voltage, when it reappears I'll post the exact fault. The controller is identified as: 6R0423156A Questions: 1.If I was to buy a replacement, can it be of a slightly different part number ie.6Q0423156? If so is this a direct drop in replacement or does it need some complex calibration? Suggested replacement parts: New: http://www.ebay.co.uk/itm/TRW-POWER-STEERING-PUMP-6R0423156-6Q0423156-VW-POLO-LUPO-IBIZA-SKODA-FABIA-NEW-/200973776369?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item2ecaf875f1 Different Part no:http://www.ebay.co.uk/itm/VW-POLO-1-2-ELECTRIC-POWER-STEERING-PUMP-6Q0423156M-6Q1423051AD-6Q2423051R-/251360198249?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item3a863c3e69 2. The garage was adamant that both the loom and the pump needed replacing, I can't personally see why the loom should fail (its just wires isnt it?) and might just need some tape to check its all sealed against water, to be honest the pump itself might still be ok and just need better water protection, what do you think? 3. Are there any service manuals/forum guides on the best way to access and replace the pump? Sorry for the long post and I hope its all in the right place, thanks in advance for the help.