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Tech Article
Audi C5 A6 Quattro 4.2 V8 Transmission Oil Pan: Dent, Leak, Valve Body Pinched WireLast Updated: 09/24/2017 | | Parts Group: Transmission oil pan | Today my tech and I made a mistake that ate the transmission oil pan on a ZF 5HP-24A in a 2000 Audi A6 Quattro 4.2 V8.
I'm writing about it in the hope that it will prevent you from having to replace your oil pan after doing a transmission service. In our case, we were doing more than a service -- we had removed, repaired and replaced the transmission, and we were bolting the oil pan back into place.
We didn’t realize that one of the wires inside the transmission was not tucked up behind the tabs in the valve body made specifically for this reason: to keep the wire out of the way. Oops. Here's how it looks when you're doing it wrong:

With a wire hanging loose, it got pinched between the body of the transmission and the oil pan, and it bent the oil pan. We didn’t notice it at first. Everything seemed fine until we’d filled the transmission up with fluid and I shut the engine off. That brings the transmission fluid level in the pan up above the seam where the transmission pan mates to the transmission body.
The leak was apparent right away. After removing the pan, we saw that it was impressively dented:


We pushed the wire to where it belonged: above the two tabs:

If you it's too late for you, and you do need to buy a used oil pan, I do have some for sale:- Transmission oil pan (03.110 in ZF 5HP-24A catalog), as on: C5 A6 Quattro 4.2 015 ECF 04/98-05/00, C5 A6 Quattro 4.2 018 FBC 05/00-07/01, C5 A6 Quattro 4.2 031 FUL 06/01-06/05, D2 A8 Quattro 4.2 014 EDG 04/99-04/00, D2 A8 Quattro 4.2 021 FBF 03/00-06/01, , Part Number: 1058203027
- Transmission oil pan (03.110 in ZF 5HP-24A catalog), as on: C5 S6 Quattro 4.2 029 FBD 05/00-06/05, D2 S8 Quattro 4.2 030 FBG 05/00-03/03, Part Number: 1058203029
- Transmission oil pan (03.110/110 in ZF 5HP-24A catalog. Part of 1058203027), as on: C5 A6 Quattro 4.2 015 ECF 04/98-05/00, C5 A6 Quattro 4.2 018 FBC 05/00-07/01, C5 A6 Quattro 4.2 031 FUL 06/01-06/05, D2 A8 Quattro 4.2 014 EDG 04/99-04/00, D2 A8 Quattro 4, Part Number: 1058203026
- Transmission oil pan (03.110/110 in ZF 5HP-24A catalog. Part of 1058203029), as on: C5 S6 Quattro 4.2 029 FBD 05/00-06/05, D2 S8 Quattro 4.2 030 FBG 05/00-03/03, Part Number: 1058203030
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