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You mean the one bellow the wheel? there are two bolts , this bolts are like a dirll point, they just rotate little and fit. Then you move the bottom cover slightly up, since there are two fixed bolt type shaft that hold that cover. So just rotate two screws, hold the cover, and move slightly up, while holding it up, and you get to the fuse and relay area. The other side you have to remove the glove compartment and you ll reach the Transmission Control Unit . If you need I have some information from Haynes 3510 book, Vauxhall/Opel Omega that is smilar to Catera 1999, which I happen to own down here in Mexico.
My 99 Deville has purge valve right on top of engine (Northstar) just rearward of throttle body. Looks like a black almost round cylinder the size of a roll of quarters with a wire connector out the back. Easy to remove and replace, and a common part to fail and set emission code.
If you are sure it's bad, buy one and you should be able to find the old one by looking at the new part.
there are two temp sendens or sensors on this car . one operates the gauge the other reports only to the computer. one is in the thermostat housing the other is in the manifold
You need to replace the traction control module located on the ABS pump. There are places in the US where they will rebuild it for you with warranty for about $150. Its tricky to get off (you need to remove the rad hose between the battery and the pump to get to it, but don't disconnect the ABS module, just the TC module mounted at end of the ABS unit (has a bunch of brake lines coming out if it).
The power steering is variable assist, relative to the speed of the vehicle, so if the speedo doesn't work, then the PS won't and you should have TC and ABS lights on. The electrical connectors to the module are tricky to remove. don't force them. One connector has a sliding lock bar.
You need to remove the upper rad hose and the battery.
Then, use a torx to remove the 6 screws (hard to get at) which will remove the EBTCM from the brake modulator. You also must disconnect the two electrical connectors (the big one has a slide tab).
There are places you can send the module to and rebuild with warranty. I took a module from a 99' and installed it in my wife's 01'. Now the speedo, odometer, cruise and power steering work perfect and no TCM / ABS light.
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