Detailed pod replacement threads are in the diesel forum, do a search.

Also, you should be able to get to the vac manifold to test each pod with a Mityvac type tool by removing the lower panel at the passenger knee area. Not sure if the opt airbag is in the way as none of my cars have them.

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'88 300TE, 175k, black RENNTech 3.6L Recaro C's AMG 1 SOLD
'92 500E, 110k, Spruce green, stock SOLD
'94 E320 Cabriolet, 130k, E500 wheels, Emerald green SOLD
'94 E320 Cabriolet, 110k, black, stock, SOLD
'88 300TE, 229k, dark grey, SOLD
'90 300CE, 212k, white, new paint, SOLD
'91 300E, 209k, white, rebuilt head SOLD
'74 914-6, grey, 2.7L 325hp twin turbo Audi conversion